Good morning. My name is Bove, and I'll be your conference operator today. Welcome to Ecovyst's Q4 2023 earnings conference call and webcast. Please note today's call is being recorded and should run approximately one hour. Currently, all participants have been placed in listen-only mode to prevent any background noise. After the speaker's remarks, there will be a question-and-answer session. Later, you will have the opportunity to ask questions during the question-and-answer session, and you may register to ask a question at any time by pressing star one on your telephone keypad. You may also withdraw yourself from the queue by pressing star two. Now, at this time, I'll turn things over to Mr. Gene Shiels, Director of Investor Relations. Please go ahead, sir. Thank you, operator. Good morning and welcome to the Ecovyst Q4 and full year 2023 earnings call. With me on the call this morning are Kurt Bitting, Ecovyst Chief Executive Officer, and Mike Feehan, Ecovyst Chief Financial Officer. Following our prepared remarks this morning, we'll take your questions. Please note that some of the information shared today is forward-looking information, including information about the company's financial and operating performance, strategies, our anticipated end-use demand trends, and our 2024 financial outlook. This information is subject to risks and uncertainties that could cause the actual results and the implementation of the company's plans to vary materially. Any forward-looking information provided today speaks only as of this date. These risks are discussed in the company's filings with the SEC. Reconciliations of non-GAAP financial measures mentioned in today's call with their corresponding GAAP measures can be found in our earnings release and in presentation materials posted on the investor section of our website at Ecovyst.com. I'll now turn the call over to Kurt Bitting. Kurt? Thank you, Gene, and good morning. First, I want to thank my Ecovyst colleagues for delivering a strong finish to 2023. Despite the economic uncertainty and operational challenges that we faced last year, our Ecovyst colleagues remain dedicated to their core purpose of delivering high-quality products and reliable services to our valued customers. Despite the macroeconomic uncertainty, relative stability and demand fundamentals across the majority of our end uses for both Ecoservices and Advanced Materials and Catalysts helped Ecovyst deliver solid financial results for the Q4 of 2023. High refinery utilization, favorable gasoline demand, and the trend toward higher octane and cleaner burning fuels continued to drive output production in 2023, providing support for our regeneration services business where volume was up compared to the Q4 of 2023. Sales volume for virgin sulfuric acid was also up compared to the Q4 of 2023, albeit with weaker pricing dynamics associated with softer macroeconomic conditions, particularly in industrial applications. In Advanced Materials and Catalysts, Q4 sales were up considerably compared to the Q4 of 2022. While polyethylene sales volume was lower compared to the prior year Q4, higher pricing and strong demand for hydrocracking catalysts and customized catalyst applications contributed to the sales growth. Given these volume and pricing dynamics, our Q4 2023 adjusted EBITDA was $70 million. During the Q4, we maintained our focus on the strategic initiatives and operational priorities that we believe are positioning Ecovyst to deliver strong growth in the future in our core and industrial applications, as well as in the emerging applications we discussed in our November Investor Day. For the Zeolyst joint venture, these emerging applications include the ongoing expansion of sustainable fuel production, both for renewable diesel and sustainable aviation fuel, and catalysts specifically designed for advanced recycling of plastic waste. We are benefiting from the growth in renewable diesel today, and we expect our Zeolyst technologies for alcohol-to-jet SAF production to gain additional momentum this year. For our advanced silicas portfolio, we highlighted a number of nascent platforms, including our AlphaCat advanced silicas and our AlphaSelect functionalized silicas for use in applications such as immobilized enzymes, carbon capture, and clean water. I'm pleased to announce that during the Q4, we achieved our first sale of advanced silicas for enzyme applications, and we anticipate additional sales this year as we look to expand our support for all these emerging applications. In light of our favorable financial results for the quarter, cash generation remained positive, providing for reduction in our net debt leverage ratio. We ended the year with a net debt leverage ratio of three times, down from 3.2 times at the end of the Q3. In terms of capital allocation priorities, continued reduction in our leverage ratio remains a key focus as we look to make substantial progress this year toward our target leverage ratio of below 2.5 times. Lastly, over the past three years, we have made significant progress in supporting our customers with more sustainable products and technologies. In addition, we have worked to drive more sustainable business practices across our organization. Consistent with the spirit of continuous improvement, two years ago, we were recognized by EcoVadis with a silver medal sustainability rating. Last year, in recognition of our continued progress, we achieved gold medal status with EcoVadis. I'm now pleased to report that Ecovyst recently achieved platinum medal status with EcoVadis in recognition of our incremental efforts to integrate the principles of sustainability and corporate social responsibility into our overall business practices. This recognition places Ecovyst in the top 1% of all companies rated in our peer group. As we turn to Slide six, I'll provide an update on our near-term demand outlook. We believe the long-term demand trends for the end uses we serve remain very compelling, and I want to emphasize that the longer-term end-use outlook, growth expectations, and financial targets we shared in our November Investor Day remain intact. However, for 2024, we believe there is significant near-term economic uncertainty arising from a number of factors, including persistent inflation, rising interest rates, destocking, geopolitical tensions, and weak demand in Europe and China. Given the current uncertain macroeconomic environment, we are cautious about the trajectory of near-term demand trends. As a result, while we anticipate stronger demand fundamentals in the second half of 2024, we have tempered our expectations for the first half of the year. For our regeneration services business, we expect high refinery utilization with stable gasoline demand and increased exports in 2024. As alcohol demand continues to be driven by tightening fuel standards such as Tier 3, we expect these fundamentals will continue to provide a favorable backdrop for our regeneration services business this year. For virgin sulfuric acid, in light of the significant impact that Winter Storm Elliott and the production headwinds we faced in 2023 had on sulfuric acid sales, we expect volume recovery for virgin sulfuric acid in 2024. Specifically, for our sales into the production of nylon intermediates, while destocking was a factor in the demand softness we experienced in 2023, we believe the destocking phase is behind us. However, the global demand outlook for engineered plastics remains uncertain, in part due to surplus capacity and continued demand weakness in Asia. We expect sulfuric acid demand for the mining applications that we service to remain stable in 2024, with ongoing copper expansion projects in the US and the longer-term projected global supply deficit for copper underpinning demand. We believe the economics of these expansion projects remain favorable with current copper prices. For the wide range of industrial applications we serve, we expect the portfolio effect will provide a level of stability for virgin sulfuric acid sales in 2024, with stable deposited demand in many end-use applications serving to counter softer demand in others. We expect relative stability in end uses such as lead-acid batteries, water treatment, and chlor-alkali to balance the potential for eroding demand in end uses such as paper and packaging, where demand weakness is being driven by capacity rationalization in certain geographies. Overall, for the first half of 2024, we see softer industrial demand for virgin sulfuric acid. While a significant amount of our virgin sulfuric acid sales are under long-term contract, we currently see weaker market sentiment resulting in pricing pressure for short-dated contracts and spot sales. For our Chem32 catalyst activation business, we see demand remaining strong in 2024, supported by continued growth in sustainable fuel production and expanded customer interest. Likewise, we see stable demand for our treatment services business, with demand and activity levels highly correlated to factors such as consumer spending. Turning to Advanced Materials and Catalysts. For our advanced silicas, we believe that the inventory destocking that adversely impacted demand for polyethylene catalysts over the second half of 2023 has run its course. While market forecasts are projecting global polyethylene demand to be up 2%-3% in 2024, we believe that excess global capacity will continue to weigh on operating rates. As such, we are not projecting a significant near-term change in the demand for polyethylene catalysts, but the prospect of a stronger second half of this year exists. We believe we are well-positioned for a recovery in demand, particularly given our representation in North American and Middle Eastern markets, where raw material and energy costs provide more favorable production economics. Following positive sales momentum in the Q4 in North America, we expect modestly lower operating rates in the mid-80% range, with weaker Q1 sales as customers work through end-of-year inventories. In the Middle East, we expect operating rates to remain robust, supported by a cost-advantaged feedstock position and strong export activity. For Europe, we expect polyethylene demand to decline in 2024 due to the poor economic climate. In Asia-Pacific, we expect the Lunar New Year and sluggish restocking activity to be a factor in the Q1. Within our Zeolyst joint venture, our core applications include hydrocracking catalysts for petroleum-based fuels and zeolites used in emission control applications. Hydrocracking catalysts are high-value-add fixed-bed catalysts that refineries change out every three-four years. Even though we expect refinery margins to remain healthy for 2024, many large customers completed catalyst changeouts last year, so we believe 2023 was likely a near-term peak year for sales of hydrocracking catalysts. We currently expect that 2024 will be a lower cycle year for hydrocracking catalyst sales. In terms of sales cadence, we have lowered our sales projections for the Q1 due to revised order timing. For our sales into emission control applications, we expect the current economic environment will translate into lower production and delivery of heavy-duty diesel vehicles. Turning to the production of sustainable fuels, which include both renewable diesel and sustainable aviation fuel or SAF, our zeolites are used in the dewaxing phase of those sustainable fuels production processes. We expect robust sales in 2024, with sales likely stronger in the second half of the year. North American renewable diesel and sustainable aviation fuel capacity is projected to grow by approximately 33% this year, supported by attractive financial incentives, with eight production facilities expected to start up in 2024. For the European Union, renewable diesel and SAF capacity is projected to grow by 43% this year, with 9 facilities expected to start up in 2024. Looking forward, we see good progress in licensor activity supporting pilot production of SAF using alternate technology referred to as alcohol-to-jet. Our zeolites have a key role to play in the agglomeration phase of this emerging technology, where our catalysts are used to build the carbon chains in the production of SAF. We believe the focus on advanced recycling technologies for plastic waste provides significant growth opportunities for Ecovyst. We continue to work with industry leaders on the application of zeolites in these recycling processes, in which our Opal Infinity family of catalysts provides a step-change reduction in thermal intensity for catalytic pyrolysis, and where Zeolyst's catalysts can be used to enhance the quality of pyrolysis oil, providing higher value-end products and expanding potential for use as feedstocks in chemical production. As we discussed in our recent Investor Day, we have already had pilot sales of our catalysts for advanced recycling. This year, there are 12 advanced recycling plants for plastic waste recycling expected to be commissioned. With the momentum we see in this area, we continue to expect commercial sales in early 2025. I'll now turn the call over to Mike for a more detailed discussion of our Q4 and full-year financial results. Thank you, Kurt. I will begin with a review of our Q4 and full-year 2023 financial results. Q4 sales, including our proportionate 50% share of sales from the Zeolyst joint venture, were $226 million compared to $223 million in the Q4 of 2022. Higher sales volume across both businesses and the benefit of continued favorable pricing within Advanced Materials and Catalysts was largely offset by the $9 million impact from the pass-through of lower sulfur costs, as well as the pass-through of lower natural gas and freight costs within Ecoservices. Adjusted EBITDA for the Q4 was $70 million, up 1% over the prior year Q4. Favorable pricing and higher sales volume were partially offset by lower net pricing in Ecoservices on lower raw material pass-through pricing. The consolidated adjusted EBITDA margin for the Q4 was 31%, in line with the Q4 of 2022. On a full-year basis, total sales for 2023, including our proportionate 50% share of sales from the Zeolyst joint venture, were $848 million compared to $953 million in 2022. Of the change in sales, $86 million was associated with the pass-through effect on pricing of lower sulfur costs. The balance of the decrease reflects lower sales volume for virgin sulfuric acid, lower demand for polyethylene catalysts, and the relative timing of niche custom catalyst sales. This was partially offset by higher average selling prices across both segments. Full year 2023 Adjusted EBITDA was $260 million, down 6% compared to $277 million for 2022, driven by the lower sales volume along with higher unplanned repair and maintenance costs. The full year 2023 Adjusted EBITDA margin was 31%, up compared to 29% in 2022. As we move to the next slide, I'll highlight the primary components of the change in Adjusted EBITDA compared to the Q4 of the prior year. Similar to the last several quarters, average sulfur costs for the Q4 of 2023 were lower than in the prior year. The pass-through of these lower sulfur costs had an impact of $9 million in variable cost, with a corresponding reduction in average selling prices. As such, the lower sulfur cost pass-through on sales during the quarter had no impact on Adjusted EBITDA. Our price-to-variable cost ratio continues to be favorable. While variable costs were lower for the quarter, the pass-through pricing on some of these costs, including natural gas and freight, were also lower. However, implemented and base price increases continue to be favorable, generating a positive price-to-cost ratio. Turning to the segment results, we will begin with Ecoservices. Ecoservices sales for the Q4 were $141 million compared to $160 million in the Q4 of 2022. The change in sales primarily reflects the pass-through of lower sulfur costs of $9 million and lower pricing in regeneration services associated with the pass-through of lower natural gas and freight costs. These factors were partially offset by higher regeneration services volume and higher demand for virgin sulfuric acid for mining and opportunistic spot sales. Ecoservices Adjusted EBITDA was $48 million in the Q4 compared to $54 million in the prior year. While demand remained strong in both regeneration services and virgin sulfuric acid, the decrease in Adjusted EBITDA was driven by lower net pricing associated with lower raw material pass-through pricing. Ecoservices Adjusted EBITDA margin for the Q4 was 34%, in line with the Q4 of 2022. Turning to Advanced Materials and Catalysts. Total Q4 sales for Advanced Materials and Catalysts, including our 50% proportionate share of Zeolyst joint venture sales, were $84 million, up $21 million or nearly 34% compared to the Q4 of 2022. For advanced silicas, Q4 sales of $31 million were up 37% compared to the year-ago quarter, reflecting higher sales across all product lines. While sales volume for polyethylene catalysts was lower compared to the Q4 of 2022, favorable pricing and the higher sales of niche custom catalysts drove the increase year-over-year. For the Zeolyst joint venture, sales were $53 million, up $13 million or 32% compared to the Q4 of 2022, primarily driven by higher sales of hydrocracking catalysts. Q4 2023 Adjusted EBITDA for Advanced Materials and Catalysts was $27 million, up $7 million or 34% compared to the year-ago quarter, with the increase driven by higher pricing and sales volume. Adjusted EBITDA margin for Advanced Materials and Catalysts was 32%, in line with the Q4 of 2022. Turning to cash and leverage on the next slide. During the Q4, cash generation was very strong, providing for a reduction in our net debt leverage ratio of 3x as we continue to make progress towards our net target of less than 2.5x. On a full-year basis, free cash flow generation was $72 million. This was in line with our recent expectations, but below the prior year, driven by the lower Adjusted EBITDA, lower dividends from our Zeolyst joint venture, higher cash taxes and cash interests, as well as an unfavorable change in working capital year-over-year. As discussed in our Investor Day in November, we continue to target a cash conversion ratio of approximately 75%. For 2023, our cash conversion ratio was 75%. We continue to maintain a balanced approach for capital allocation, with net leverage reduction remaining a key priority. During 2023, we used cash to repurchase shares, largely in connection with secondary offerings of our equity sponsors. In 2023, we repurchased 7.5 million shares for $79 million. Our balance sheet remains in strong shape. At year-end, we had total available liquidity of $152 million, comprised of $88 million of cash and availability under our ABL facility of $64 million. We have one tranche of debt outstanding, which matures in 2028. Excluding outstanding letters of credit, there were no outstanding borrowings under our ABL facility at year-end. We have capped our interest exposure on approximately 75% of our outstanding debt out to the Q3 of 2026, and our weighted average cost of debt was approximately 5% during 2023. Now let's turn to guidance and expectations for 2024. For 2024, we expect sales on a GAAP basis to be between $715 million-$755 million, and we expect our proportionate 50% share of sales for the Zeolyst joint venture to be between $145 million-$165 million. As such, we anticipate total sales, including our proportionate share of the Zeolyst joint venture sales, to be between $860 million-$920 million, or up approximately 5% at the midpoint compared to 2023. In terms of the pass-through effect of sulfur pricing, we are currently expecting a very modest decrease in average sulfur pricing for the first half of 2024, with the impact on sales largely in material. As Kurt discussed in his comments about our end-use demand outlook, the value of octane and alkylate remains favorable, and we expect continued high refinery utilization to support regeneration services activity. We expect a modest but cautious recovery of virgin sulfuric acid sales relative to 2023, primarily related to demand for virgin sulfuric acid going into the production of nylon intermediates and the expectation for higher year-over-year production volume. As such, we expect sales in Ecoservices to be up mid-single digits. In Advanced Materials and Catalysts, we expect improvement in demand conditions for polyethylene catalysts and growth in our customized catalyst applications to drive high single-digit to low double-digit sales growth in advanced silicas. For the Zeolyst joint venture, while we expect continued growth and sustainable fuel catalyst sales in 2024, sales of hydrocracking catalysts are expected to be significantly lower, which is typical when coming off a peak year like we experienced in 2023. For 2024, we are expecting Adjusted EBITDA to land in the range of $255 million-$275 million. In terms of segment expectations, for the full year 2024, we expect Adjusted EBITDA for Ecoservices to reflect a mid- to high single-digit% increase compared to 2023, based on the anticipated recovery of virgin acid sales into nylon intermediates, strong virgin acid sales into mining, and higher contracted pricing in regeneration services. This is somewhat offset by downward pressure on virgin acid pricing driven by the uncertain macroeconomic environment and $10-$15 million of higher maintenance and turnaround costs associated with enhancing our operational reliability to help ensure long-term volume increases, as we discussed during our November 2023 Investor Day. For Advanced Materials and Catalysts, we expect 2024 overall Adjusted EBITDA to be in line with 2023. Advanced silicas is expected to be up on a high single-digit basis, driven by more normalized demand growth for polyethylene catalysts and sales into emergent areas. Adjusted EBITDA for the Zeolyst joint venture, however, is expected to be down on a high single-digit% basis, driven by lower sales of hydrocracking catalysts off a peak year in 2023, anticipated unfavorable fixed cost absorption associated with production and sales timing, and increased costs to accelerate the growth in our emerging applications. In addition, we expect our corporate costs to be around $30 million on an annual basis. For the full year 2024, we are expecting adjusted free cash flow of $85-$105 million, including CapEx of $70-$80 million in 2024. The higher CapEx reflects costs associated with the previously announced expansion of advanced silicas capacity and our Kansas City site and investment in our Chem32 catalyst activation business. Given this expectation for cash generation and assuming no uses of cash for other capital allocation priorities, we expect to delever nearly half a turn, resulting in significant progress towards our target net debt leverage ratio of below 2.5 times. For interest expense, taking into account the interest caps that we have in place, which cover approximately 75% of our exposure, we are projecting a range of $45-$55 million, with a weighted average cost of debt of approximately 5.5%. Having covered our expectations for the full year of 2024, I want to provide some directional guidance for the Q1 of 2024. On a consolidated basis, we expect Q1 2024 Adjusted EBITDA to be approximately $40 million. For Ecoservices, in light of the impact of Winter Storm Elliott and impact of the extended turnarounds in the Q1 of last year, we expect Q1 2024 Adjusted EBITDA to be up approximately 10% compared to the Q1 of 2023. For Advanced Materials and Catalysts, we expect Q1 2024 Adjusted EBITDA to be between $7 million-$8 million. The lower Adjusted EBITDA compared to the prior year is primarily driven by a cautious view around the recovery of the polyethylene market and anticipated unfavorable fixed cost absorption associated with production and sales timing. I'll now hand the call back to Kurt for some closing remarks. Thank you, Mike. Despite near-term economic uncertainty, we remain positive on the long-term growth opportunities for Ecovyst. We believe our core and industrial businesses will continue to experience solid growth. We have well-established customer relationships, leadership positions in the end uses we serve, and we have articulated our plans to drive efficiency gains and to support sales growth through automation, debottlenecking opportunities, capacity expansions, and through reliability initiatives in our Ecoservices segment that will also translate into incremental volume and sales opportunity. For our regeneration services business, we believe the role of alkylate in the production of cleaner burning fuels is well appreciated, and the long-term demand outlook for refined products in North America and the export markets our customers serve will continue to provide opportunities for growth. Although we see some near-term demand softness in some industrial applications for virgin sulfuric acid, mining demand remains strong, and we expect further improvement in demand for virgin sulfuric acid sales into production of nylon intermediates as the global economy improves. We also believe the portfolio effect for the balance of our industrial applications will continue to provide a level of overall stability. In terms of our sales of polyethylene catalysts, we believe global polyethylene demand will return to historic growth rates of approximately 3%. Specifically for Ecovyst, we expect our sales of polyethylene catalysts will continue to grow differentially to the overall market, benefiting from our customized catalyst design approach and our leading supply share positions in North America and the Middle East, which benefit from advantaged feedstock and energy costs. Lastly, we have announced a significant expansion of polyethylene catalyst production capacity at our Kansas City site that is supported by firm customer commitments, providing further support for our future growth expectations. Moreover, we are energized by the opportunities for growth provided by emerging technologies, which are not just aspirational. We continue to see robust growth in catalysts supporting the production of sustainable fuels. We have the technology leadership position for zeolites for advanced recycling technologies, and we have developed advanced silicas and functionalized silicas that position us to capture growth in enzyme immobilization in food, chemical, and biomass-based processes, as well as carbon capture and water treatment applications. In summary, we have a portfolio of products and technologies that we believe provide for compelling organic EBITDA growth, as we discussed in our Investor Day. The long-term growth trend supporting Ecovyst products and services is reflected in the anticipated 2024 volume growth across the majority of our product lines. Our current guidance reflects our caution around near-term demand conditions and the expected off-cycle year for event-driven hydrocracking sales. As I indicated earlier, we believe the second half of the year could provide for improved demand conditions, including stronger sales of virgin sulfuric acid and polyethylene catalysts, and we will capture opportunities for incremental growth as they arise. At this time, I will ask the operator to open the line for questions. Thank you, Mr. Bitting. Ladies and gentlemen, at this time, if you would like to ask a question, please press the star one on your telephone keypad, and you may remove yourself from the queue at any time by pressing star two. Once again, it's star one to ask a question this morning, and we'll go first to Patrick Cunningham at Citi. Hi, good morning. This is Eric Zhang on for Patrick. My first question is, what is driving the higher pricing for key catalysts, and do you expect that trend to continue? Hi, Eric. This is Kurt. Well, for polyethylene, we do believe that destocking that we saw really in the latter half of 2023 is largely behind us, and we do expect double-digit sales growth during the year, albeit weighted towards the second half of the year. And we've implemented price increases as time goes along and has allowed us on our contracted prices. Just a further comment really on polyethylene and our expectations, Eric. It's geographic-centric as well, where most of our sales are centered in North America as well as the Middle East, where those regions have a high advantage in terms of raw materials and lower energy costs. Europe, we're less exposed and less exposed in Asia-Pacific, and those two regions generally have more of a muted recovery or less of an uptick this year. Okay. Got it. Thank you. And my last question is, within Ecoservices, can you elaborate on any trends that you're seeing with existing customers recontracting? Have there been any difficulties in getting customers to re-sign? Thank you. Thanks for the question. So when you look at the regeneration business every year, those contracts are generally longer in length, so anywhere 5-10 years. So any given year, there's a certain basket of contracts that are up for renegotiation and recontracting. So I would say as time has gone along, we've re-upped those customers, and we've been successful at implementing price increases as time has gone along. In virgin acid, about 90% of our customers are under a long-term contract basis. The 10% that we call kind of spot sales or short-dated contracts, that's where we've seen a little bit of pricing pressure, as I've mentioned on the call. That's really related, I would say, mainly to the industrial space where we see some caution from some of those industrial consumers around 2024. Great. Thank you. Thank you. We go next now to Aleksey Yefremov at KeyBanc Capital Markets. Thanks. And good morning, everyone. Just to follow up on the industrial piece of virgin acid sales, could you quantify the magnitude of this price pressure either as a total percent of your virgin acid business or as a percent of that bucket of short-term contracts? Sure. Good morning, Alexey. So virgin acid, again, when you look at our portfolio on virgin acid, 90% of it is really under long-term agreements, which we're adjusting on longer-term contracts, right? So it's just that 10% that's on that short-dated or we call spot sales, those sorts of things. So what we see in this area is, again, some cautious customers on the industrial side. And there's also been some rationalization really in the pulp and paper industry. We don't move a lot of volume into that industry, but it has created, I guess, some pockets of oversupply in different geographies where we don't operate. But that's created some, I'd say, temporary imbalances in a couple of the geographies that really has to settle itself out. So if we had to quantify that really, Alexey, you talk about 10% of our virgin acid portfolio, it's probably $5 million-$10 million in terms of pricing that's subject to this pressure that we're seeing in the industrial space. Thanks, Kurt. Very helpful. You mentioned increased cost driven by investments in these emerging applications. Kind of hard from outside to judge, is this because it just costs more to do what you envisioned, or is it really that there's bigger opportunity and those opportunities are coming faster at you? Could you elaborate on this? Yeah. So as we stated during our Investor Day, growing our emerging technologies is really a key priority for us when we look at some of the things like advanced plastics recycling, sustainable fuels, the advancements now that we're making on the immobilized enzymes. So we're really on the front end of that where we're building out our capabilities in those areas, building out our sales and marketing capabilities in those areas. So we're making those front-end investments as expected to deliver long-term sales as we've outlined in our Investor Day. Thanks a lot. Thank you. We go next now to John McNulty at BMO. Yeah. Good morning. Thanks for taking my question. So, question on the EBITDA on Advanced Materials and Catalysts. So, it looks like the first half is going to or, excuse me, the Q1 is going to be basically almost half of what it was the prior year, which kind of implies the back half or the remaining three quarters, excuse me, is basically flattish. So, I guess, can you help us to think about where the improvement comes from? Is the bulk of it just the lumpiness in the HPC catalyst side, or is it the polyethylene ramp that you're talking about? I guess, what's the bigger contributor to kind of the weakness in Q1 and the snapback as we look at kind of the remaining three quarters? Yeah. Hey, John. This is Mike. Thanks for the question. Yeah. It's a combination of all those factors, right? So we mentioned earlier that we're seeing a little bit of a cautious feel in Q1 around polyethylene starting out, but we do expect the polyethylene demand to continue and actually improve over the prior year, call it in a double-digit basis. We also see that hydrocracking, while we came off a peak year from last year, it is a little lighter in Q1 than originally anticipated, but we do see it growing in Q2, Q3, and then into Q4. So it's a little bit of the nature of the business, primarily around the hydrocracking and the timing, along with some of the niche custom catalysts. Polyethylene is more constant. However, just given off of what we saw in 2023, it's a little lighter starting out, but it's ramping up certainly in the later half of the year. Got it. Okay. No, that makes sense. And then in one of the slides, you highlighted some weakness in the heavy-duty truck markets, which I assume is tied to some of the new regulations where there was maybe a little bit of pull forward. I guess, how long does that normally last? Is that a year? Does it tend to last a little bit longer than that? I guess, how should we be thinking about that? Yeah. Thanks, John. There's a couple of headwinds there really in the trucking where there's just a general, I'd say, slowdown in that transportation segment right now, which is, well, I think linked to the general economic uncertainty going on. And then they're also coming off working off a pretty big backlog that had developed in 2021, 2022, and 2023 where a lot of trucks were there were big backorders, and they've worked those off. So you see some slowness there. Additionally, the Euro 7 regulation that was due to go in effect in 2027, Europeans have delayed that for two years, which has pushed off some of the, I'd say, next-generation catalyst technologies that we're going to go into those trucks that we're going to reduce emissions by 80%. So the combination of those things has kind of created a little bit of the headwind for that segment this year. Got it. Thanks very much for the call. Thank you. We go next now to David Begleiter at Deutsche Bank. Thank you. Good morning. Kurt, in Ecoservices, you had a number of headwinds in 2023, the winter storm, outages, turnarounds, and some weak demand and destocking. So given that, why isn't the EBITDA growth a little faster than mid-5%+ in 2024? Yeah. Sure. Thanks for the question, David. As we stated on the call and a few times, we've taken a cautious look for 2024. Many of our customers, particularly in that, I'd say, that industrial segment, have adopted cautious approaches for 2024, and that's played into our overall opinion on the demand trend, especially as it relates to virgin sulfuric acid. When you look at what we expect from 2024 in Ecoservices, refining margins or refining business remains healthy. We expect a strong year for regeneration. The treatment services business and Chem32 both look to have very full schedules this year. It's the virgin acid business where we do plan on moving more volume into the market this year, particularly into nylon where there were headwinds last year. We see a recovery there. I wouldn't say it's necessarily an upcycle year. However, we do expect to move more product into that nylon segment. Where we see that some of the headwinds on Ecoservices is that earlier on, one of the questions I talked about, that industrial space and the pricing pressure it's creating in that short-term and spot pricing segment of the virgin acid space, as well as we're spending about $10 million-$15 million more on maintenance and reliability this year. During the Investor Day, we talked about we have a long-term reliability enhancement program that we're instituting, which is a combination of really additional resources at the plants as well as some automation, which is there really to deliver higher reliability as well as debottlenecking at the plants over time. So that's some of the change you see there is really pushing in that extra cost to kick off that reliability enhancement program. And Kurt, on that program, is that a one-time effort, or should we I mean, i.e., in 2025, should that come back down by $10 million-$15 million, or should that be sustained at this higher level? Yeah. Some of that will be and I didn't mention too, we do have additional turnaround costs. So some of that will be sustained because it's going to be the resources we're putting in place will be on a sustained basis. We do have accelerated turnaround costs this year, which those mostly are actually going to take place in the first half of the year. And then the automation piece that we're putting in place, obviously, will go on to the plants. So I would think a portion of that will be sustained over the horizon. Thank you. Thank you. We go next now to Hamed Khorsand at BWS Financial. Hey. Good morning. So first question I had was, given what has happened in 2023 to your business, how have you adjusted in 2024? I mean, are you through all the inventory that you might have had in 2023 because of the disruptions and so forth? So what kind of lingering effects are there from 2024, from those effects in 2023? Yeah. Good morning, Hamed. I think really what in terms of 2023, we obviously had $20 million-ish of headwinds that were operational-related in the Ecoservices business when you go back to the winter storm that started out at the beginning of 2023, and then we had the extended maintenance downtime at the Houston plant. So we don't expect those events this year. Obviously, I just talked about the enhanced reliability program, which will yield higher volumes. And we do expect to produce and sell more virgin sulfuric acid volumes this year, even though I've talked about some of the industrial headwinds and some of the pockets in the virgin acid market. I think the other areas that we talked about last year that were headwinds for us was polyethylene catalysts, which in the second half of the year, there was destocking that went on. We see that abating and recovering, and as Mike said, particularly in the second half. So we do expect polyethylene catalysts to be up in double digits this year. And then secondly, the nylon segment, which impacted the virgin acid business last year in the second half, we saw destocking in that area. We do expect nylon volume to be up for us this year, albeit not certainly a high-cycle year, but certainly a recovery there. Okay. My last question is, on the slides provided today, you're highlighting the slow conditions for heavy-duty vehicles. That's a new item for you on the slide. Why is that such a big deal now versus prior quarters where that was not even an issue, even from a positive side or negative side? I mean, how bad of a drag is this that you're highlighting it now? Yeah. I think, Hamed, it's not, I think in the past, over the past year or two, the business was largely just moving along in terms of the backlog of the heavy-duty diesel vehicles. It's not an overly huge segment for us. And essentially, we view that market as we see headwinds there in terms of just the demand for overall heavy-duty diesel vehicles as well as the regulation thing that I mentioned earlier on Euro 7. But when we look at it from a sales standpoint, it's flattish for us. So I wouldn't call it necessarily a huge drag for us. It's an area that we see in the segment that there definitely are headwinds in that segment. Okay. Thank you. Thank you. And just a reminder, ladies and gentlemen, any questions, please press star one this morning. We'll go next now to David Silver at CL King. Me. Sorry. Got to go. Yeah. Hi. Thank you very much. I had a question maybe about some of your spending initiatives over the next year. But for starters, there is something of an increase in your CapEx spend. And I'm guessing some part of that is Kansas City. And along those lines, just with the timeline there, I was just wondering if the CapEx spend might have even been a little bigger to prepare for the anticipated demand growth. And then beyond that, I'm just wondering if you could articulate or highlight any increase in either R&D spend or pre-commercialization type of spending. But beyond, I guess, the operational things, I mean, what other kind of spending initiatives should we be thinking about to support your growth, which you highlighted in the release and in some of your comments here? But is there a way to kind of get a clearer view of that, please? Thank you. Yeah. Hi, David. Good morning. This is Mike. So on the first part of the question around capital spending, you are correct. We do see about, given our guidance range, at the midpoint, a roughly $10 million increase in CapEx spending. The predominance of that is associated with the Kansas City expansion. I think we mentioned this during our Investor Day that it would take a period of time, certainly over at least a 2-year period going into 2025. Our spend on that facility is not a bottoms-up approach. We already have structures and availability there. We're just expanding upon that. The CapEx cost is not perhaps as significant as you might think with building a brand new plant. But we are adding about 50% capacity for making our polyethylene catalyst there. We also have some additional costs in the capital spending around Ecoservices to continue to start to look and expand our Chem32 catalyst activation business. There's some spending in there as well. When you look at the R&D and pre-commercial, Kurt mentioned earlier that we are seeing some additional spending in the just as we start to ramp up some of our emerging products. So we are seeing a little bit of additional cost there. But again, as we mentioned, we're very excited on where our sales have been taking us. We've already had some sales in 2023 related to the biocatalysis, and a lot of it is exactly how we articulated during our November Investor Day. Hopefully, we also talked a little bit more about the spending on Ecoservices related to the reliability and turnaround costs that we talked about earlier. So hopefully, that covers some of your questions on the cost and spending. Yeah. Thank you for that. Then maybe just from another angle, yeah, I was wondering about the operational plans, the downtime overall planned by your portfolio of refining customers. So I guess refining margins largely have been very healthy for the last few years. And anecdotally, I guess a lot of refineries have deferred or delayed downtime as much as they could to take advantage of what they viewed as favorable profit opportunities. As you kind of look at the planned downtime and planned operating strategies that your refiner or your customers have shared with you, I mean, should we expect another year of very high or close to full utilization there, or are there some major outages or downtime planned relative to maybe 2023 or 2022, excluding the weather events? Thanks. Sure. Thanks, David. So in terms of when we look at the refinery downtime, it affects two parts of the business differently. When you look at Ecoservices on the acid regeneration, we don't really see a particularly high amount of customer turnarounds this year in their alkylation units. So we're expecting, I would say, more of an average year. We look at hydrocracking catalysts. Obviously, we're coming off a peak cycle year in 2023 selling hydrocracking catalysts. If some of those turnarounds took place in Q4 of 2023, some of them are taking place in Q1 of 2024. They were buying the catalyst to have it on site for their turnaround. So we expect, and again, hydrocracking to be more of a low cycle this year. So we do expect less turnarounds in that space as well. But those are for our customers. So there certainly are other refineries or other regions that could have different issues. But in general, I think we'd be certainly average in the Ecoservices side and less turnarounds in hydrocracking just because it's an off-cycle year. Yeah. Yes. You did highlight that there. Okay. That's great. Thank you very much. And we'll take a follow-up question now from John McNulty at BMO. Yeah. Thanks for taking my follow-up. So on the polyethylene catalyst demand, which is a pretty strong forecast for the year, up double digits, I guess, can you help us to think about how much of that's just core industry growth versus account wins? Because I think you have had a bunch of wins, and some assets are still in the process of ramping up. So that may be some of the benefit. But can you help us to think about that high level? Sure. I mean, I think it's a mix, really, John, of both wins and just increased utilization rates. So you see a recovery, particularly in the Middle East and North America. Or right now, at very low natural gas prices, are enjoying a huge arbitrage window in polyethylene production. So we obviously have a little heavier weighting to those areas. So we're seeing some recovery in that area. And again, I think Mike mentioned it's more second-half weighted. So a lot of it's recovery, but yes, and some of it's recovery of new account wins that we've had as well. So it's a little bit of a mixed bag. But if I had to give it the weighting, I'd say it's more just on the general recovery side. Got it. Thanks for the color. And ladies and gentlemen, it appears we have no further questions today. That will bring us to the conclusion of Ecovyst Q4 2023 earnings conference call. We'd like to thank you all so much for joining us today and wish you all a great remainder of your day.