Michael Feehan
Analyst · KeyBanc Capital Markets
Thank you, Kurt. Ecovyst sales for the first quarter of 2024, including our proportionate 50% share of sales from the Zeolyst joint venture were $184 million, slightly higher than the first quarter of 2023. Ecoservices sales were up 3%, reflecting higher sales volume in virgin sulfuric acid and regeneration services. However, Advanced Materials and Catalyst sales were down as lower sales of advanced silicas used for the production of polyethylene were only partially offset by higher sales from the Zeolyst joint venture. Adjusted EBITDA for the first quarter was $45.5 million, up 6%, driven primarily by the contribution from higher sales volume. The adjusted EBITDA margin for the first quarter was 24.7%, up a 130 basis points over the prior year.
Turning to the next slide, I will discuss the primary components of the change in adjusted EBITDA compared to the first quarter of last year. Looking at the major drivers of the change in adjusted EBITDA, the higher sales volume provided a pull-through benefit of approximately $10 million. However, while aggregate pricing, including the $5 million sulfur pass-through effect was down $16 million period-over-period, the lower pricing resulted from the pass-through of $17 million in lower variable costs, which included lower sulfur, natural gas, electricity, and other variable costs. Overall, the net impact resulted in a positive price-to-cost ratio for the quarter.
The balance of the change in adjusted EBITDA is comprised of a number of factors, including approximately $3 million of higher planned turnaround costs, higher fixed manufacturing costs associated with our reliability initiative, costs attributed to winter storm Heather, and inflation in our labor costs. As we transition to our segment results, I'll start with the highlights for Ecoservices.
Sales for the first quarter of 2024 were $142 million, up 3% on higher sales volume for virgin sulfuric acid and regeneration services, primarily reflecting recovery from the prior year's lower sales volume that was adversely impacted by winter storm Elliott and the extended turnaround. The sales increase was partially offset by the pass-through effect of lower sulfur prices of $5 million as well as the pass-through effect of other variable costs such as natural gas and electricity.
First quarter 2024 adjusted EBITDA for Ecoservices of $41.5 million was up 13%, with the benefit of higher sales volume, partially offset by the higher turnaround costs, higher fixed manufacturing costs, and costs associated with the winter storm. Overall, it was a positive quarter for Ecoservices and a solid start to the year with adjusted EBITDA up 13% and the associated margins of 29%, up 260 basis points from the first quarter of 2023.
For Advanced Materials and Catalyst, first-quarter sales, including our 50% proportionate share of Zeolyst joint venture sales were $42 million, down $3 million. Sales for the Zeolyst joint venture were up 6%, driven by higher sales of catalysts used in sustainable fuel production and sales growth in customized catalyst applications. However, sales for advanced silicas decreased year-over-year due to lower sales volume of advanced silicas used for the production of polyethylene. While sales of finished catalysts used to produce polyethylene were up, sales of polyethylene catalyst supports were lower due to customer order timing and limited destocking.
For the full year, we continue to expect higher sales of advanced silicas used for the production of polyethylene compared to 2023 with an expected stronger second half of the year compared to the first half. Adjusted EBITDA for Advanced Materials and Catalyst was $11 million compared to $13 million in the year ago quarter with higher sales volume and favorable mix in the Zeolyst joint venture offset by the lower sales in advanced silicas.
Turning to cash and leverage on the next slide, cash generation in the first quarter of 2024 was particularly strong, benefiting from the dividends received from the Zeolyst joint venture that were deferred from the fourth quarter of 2023 due to the timing of working capital. As such, we ended the first quarter with cash of $103 million, including the $70 million of availability under our ABL facility. We ended the first quarter with total liquidity of $173 million. In light of the strong cash generation and higher adjusted EBITDA, we ended the first quarter with a net debt leverage ratio of 2.9x, down from 3.0x at the end of the year. At this time, we remain on target to generate free cash flow for this year of $85 million to $105 million.
In terms of capital allocation, we expect to continue to maintain a balanced strategy. From an overall balance sheet perspective, we have one tranche of debt maturing in 2028. We have capped our interest exposure on approximately 75% of our outstanding debt out to the third quarter of 2026, and our weighted average cost of debt is expected to be approximately 5.5% during 2024.
As it relates to our guidance, the full-year outlook that we provided in our fourth quarter earnings call in late February remains unchanged with GAAP sales of $715 million to $755 million, sales for the Zeolyst joint venture of $145 million to $165 million and consolidated adjusted EBITDA of $255 million to $275 million. As is our usual practice, the guidance ranges for specific modeling line items are included in today's earnings press release and in the earnings presentation.
In terms of directional guidance for the second quarter, on a consolidated basis, we expect second quarter 2024 adjusted EBITDA to be between $50 million and $55 million. For Ecoservices, we expect adjusted EBITDA for the second quarter to be down compared to the prior year in a range of between $48 million and $52 million. While we expect sales volume to be higher in the second quarter compared to the prior year, higher fixed costs, including an increase in the number of turnarounds and the related costs, along with an unfavorable net pricing impact is expected to drive lower earnings for the quarter. The unfavorable net pricing is expected to reflect the timing and the contractual pass-through of certain costs, including energy and other index costs.
For Advanced Materials and Catalysts, we expect the second quarter 2024 adjusted EBITDA to be sequentially flat to the first quarter of 2024, with a range of between $10 million and $12 million. The results are expected to be lower than the prior year's second quarter, driven by lower sales of advanced silicas used for polyethylene production, unfavorable product and customer mix, and the unfavorable impact of fixed cost absorption on inventory period-over-period. And we continue to expect corporate costs to be between $7 million and $8 million per quarter. I will now hand the call back to Kurt for some closing remarks.