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PQ Group Holdings Inc is a global provider of catalysts, specialty materials, chemicals and services that enable environmental improvements. The Company’s products and solutions help companies produce vehicles with fuel efficiency. The Company has developed zeolite-based catalysts to reduce pollutants in diesel engines. The Company’s segments include environmental catalysts and services, and performance materials and chemicals. Environmental catalysts and services segment has three product groups, including silica catalysts, zeolite catalysts, and refining services. Silica catalysts product group sells both the finished catalyst and catalysts supports, for the production of high-density polyethylene (HDPE).zeolite catalysts product group is a supplier of emissions control catalysts as well as a supplier of specialty catalysts, precursors, and formulations. Performance materials and chemicals segment has two product groups, including performance materials and performance chemicals.