Promoter Deactivation of Platinum Group Metals Promoted Cracking Catalysts

Abstract The physical and chemical factors influencing the regeneration improving promoter function of platinum group metals containing cracking catalysts have been investigated. Promoter function was characterized by the carbon monoxide conversion activity of the catalyst preparations. Commercial catalysts showed characteristic differences upon thermal and hydrothermal treatments. Transition metals-nickel, iron and vanadium-reduced the carbon monoxide conversion activity in different ways. Sulphidation by hydrogen sulphide treatment did not affect the regeneration activity, while sulphur dioxide, derived from sulphur containing coke, caused reversible poisoning