Effect of Alumina Binder on Catalytic Performance of PtSnNa/ZSM-5 Catalyst for Propane Dehydrogenation

Abstract

The influence of alumina binder on the catalytic performance of PtSnNa/ZSM-5 catalyst for propane dehydrogenation was studied. Solid-state 27Al MAS NMR spectroscopy, temperature-programmed desorption of ammonia (TPDA), temperature-programmed oxidation (TPO), catalytic grain intensity, hydrogen chemisorption, BET surface area, and pore size distribution measurements were used to characterize the catalysts. It was found that the addition of binder results in a decrease in the surface area of the catalyst but an obvious improvement in its particle intensity. Some soluble Al species from the binder might migrate into the ZSM-5 zeolite framework during calcination so as to produce some acid sites of moderate intensity, which consequently increases the acid amount of the catalyst. When propane dehydrogenation is carried out under the same space velocity by changing the weight of the corresponding catalyst, the acid amount is the dominant factor influencing the catalytic properties. When this reaction is perform...