Effect of catalysts modified with functional components on gasoline sulfur reduction

The zeolite modified with different functional components was researched.The samples were characterized by IR method and test in CSA-B type catalyst evaluation device,catalytic cracking selectivity was studied using a mini-fixed fluid bed reactor.The results showed that acidity and hydrothermal stability of zeolite have changed after modification.Comparing the acidity of zeolite modified with Cu,V and Zn,the acidity strength of zeolite modified with V was the weakest,that with Zn the second strongest and with Cu were the strongest.Vanadium destroyed the crystal structure of zeolite heavily while Zn's destructive effect was lighter.Sulfur compounds cracking need weaker L acid active sites in the catalyst and more strong L acid led to the production of coke.Compared with the base catalysts,the catalyst in this study can reduce gasoline sulfur by 22%;in the meanwhile,the selectivity of cracking products was better.