Guoliang Zhao

Catalytic cracking reactions of C4-olefin over zeolites H-ZSM-5, H-mordenite and H-SAPO-34

Zeolites ZSM-5, mordenite and SAPO-34 were synthesized hydrothermally, using hexamethylenediamine(HMDA), tetraethylammonium bromide (TEABr) and morpholine as directing agents, respectively. Their catalytic performances in C4-olefin cracking reactions were investigated under a weight hourly space velocity as high 15 h–1. It was found that the acid strength of these samples followed the order of H-SAPO-34 H-mordenite. Among these samples, the H-ZSM-5 zeolite was the optimal catalyst for C4-olefin cracking to produce propylene. The H-ZSM-5 zeolite with small crystal size exhibited higher stability than the H-ZSM-5 with large crystal size for a long time-on-stream.