PQ Group Holdings, Inc. engages in the manufacture of specialty catalysts, materials, and chemicals. It operates through the following segments: Refining Services, Catalysts, Performance Materials, and Performance Chemicals. The Refining Services segment offers sulfuric acid, virgin sulfuric acid, Oleum ECO services, sulfuric acid regeneration, aluminum sulfate, treatment services, industrial field services. The Catalysts segment includes zeolites, anti-blocking agents, chemical catalysis, polyolefin supports, chrome catalysts for high-density polyethylene, and polyolefin catalysis. The Performance Materials segment produces transportation reflective safety markings for roads and airports. The Performance Chemicals segment supplies personal and industrial cleaning products, fuel-efficient tires, surface coatings, and food and beverage products. The company was founded in 1831 and is headquartered in Malvern, PA.