WAYNE, Pa. , Sept. 11, 2025 /PRNewswire/ -- Ecovyst Inc. (NYSE: ECVT) ("Ecovyst" or the "Company"), a leading integrated and innovative global provider of advanced materials, specialty catalysts, virgin sulfuric acid and sulfuric acid regeneration services , announced today that it entered into a definitive agreement to sell its Advanced Materials & Catalysts segment to Technip Energies ("Buyer"), a global technology and engineering company, for a purchase price of $556 million. ...