Currently, high silica ZSM-5 zeolite as a commercial catalyst has been widely applied in industrial methanol-to-propene processes (MTP). By a series of deep investigation on the ZSM-5 catalyst, it is proposed a precisely adjustive zeolite structure with large micropore openings, fast mass transfer, high Si/Al ratios (70-150), and proper acidic property (density and strength) would be of significance for preparation of highly efficient MTP catalyst. According to these requirements, in this work we have rationally synthesized M-Beta-91 zeolite with 12-memberd ring openings, very high mesopore volume (as high as 0.942 cm<sup>3</sup>/g), high silica Si/Al ratio (91), and relatively weaker acidic strength than the ZSM-5 in the absence of fluoride species. As we expected, the M-Beta-91 exhibits the propene selectivity as high as 55.4% and catalyst life as long as 120 h, outperforming the results from conventional Beta zeolite and commercial MTP catalyst of high silica ZSM-5 zeolite. In addition, the fluoride-free synthesis of high silica Beta zeolite is favorable for industrial production of the Beta catalysts because it is completely avoided the formation of fluoride-based wastes. The combination of excellent catalytic performance and fluoride-free route for M-Beta-91 is potentially important for developing highly efficient MTP catalyst in the future.<br/>

Selective conversion from methanol into propene over mesoporous high silica beta zeolite

2019 Fall National Meeting

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