Ecovyst Inc. offers specialty catalysts and services in the United States and internationally. The company operates through two segments, Ecoservices and Advanced Materials & Catalysts. The Ecoservices segment provides sulfuric acid recycling services and end-to-end logistics for production of alkylate for refineries; and virgin sulfuric acid for mining, water treatment, and industrial applications. The Advanced Materials & Catalysts segment offers advanced materials and specialty catalyst products and process solutions to producers and licensors of polyethylene. This segment also offers advanced silicas and zeolite catalysts; and supplies specialty zeolites and zeolite-based catalysts to customers for refining of oil primarily hydrocracking catalyst and dewaxing, sustainable fuels, and emission control systems for both on-road and non-road diesel engines. The company was formerly known as PQ Group Holdings Inc. and changed its name to Ecovyst Inc. in August 2021. Ecovyst Inc. was founded in 1831 and is headquartered in Malvern, Pennsylvania.