Type	Name	Date
Credit agreement	New Term Loan Credit Agreement, among CPQ Midco I Corporation, PQ Corporation, Eco Services Operations Corp., Credit Suisse AG, Cayman Islands Branch, as administrative agent and collateral agent, and the lenders from time to time party thereto	07/28/2020
Credit agreement	New Term Loan Credit Agreement, among CPQ Midco I Corporation, PQ Corporation, Eco Services Operations Corp., Credit Suisse AG, Cayman Islands Branch, as administrative agent and collateral agent, and the lenders from time to time party thereto	07/28/2020
Indenture	Indenture, among PQ Corporation, as Issuer, the guarantors party thereto and Wells Fargo Bank, National Association, as trustee	12/13/2017
Indenture	Indenture, among PQ Corporation, as Issuer, the guarantors party thereto and Wells Fargo Bank, National Association, as trustee	12/13/2017

Type	Name	Date
Severance agreement	Severance Agreement, between Ecovyst Catalyst Technologies LLC and Kurt J. Bitting	12/22/2022
Severance agreement	Severance Agreement, between Ecovyst Catalyst Technologies LLC and Michael Feehan	12/22/2022
Severance agreement	Severance Agreement, between PQ Corporation and Belgacem Chariag	08/09/2018