纳米薄层HZSM-5分子筛催化甲醇制丙烯

doi:10.3866/PKU.WHXB201401032

Abstract

Abstract:

Nanosheets of HZSM-5 zeolite with different SiO₂/Al₂O₃ molar ratios were synthesized, and their catalytic behavior in the methanol-to-propylene (MTP) reaction was evaluated in a fixed bed reactor. The effect of reaction conditions on catalytic performance was studied in detail. The catalytic performance of nanosheets of HZSM-5 zeolites in the MTP reaction was compared with that of the nanosized HZSM-5 zeolite. The nanosheets of HZSM-5 zeolite had higher propylene selectivity, total three olefins' selectivity (ethylene, propylene, C₄ alkenes) , and a longer catalytic lifetime than the nanosized HZSM-5 zeolite. The nanosheets of HZSM-5 zeolite with a SiO₂/Al₂O₃ molar ratio of 213 yielded a propylene selectivity of 46.7%, total three olefins' selectivity of 78.7% at 470 ℃, and a methanol weight hourly space velocity (WHSV) of 3 h^-1. It also yielded a propylene/ethylene mass ratio of 6.5, which was double that of the nanosized HZSM-5 zeolite. The nanosheets of HZSM-5 zeolite had a lower aromatic selectivity than the nanosized HZSM-5 zeolite. The good MTP catalytic performance of the nanosheets of HZSM-5 zeolite was attributed to their wide (010) surface, high external surface area, and large mesoporous volume.

Key words: Nanosheet, HZSM-5 zeolite, Methanol, Propylene

MSC2000:

O643

ZHANG Shao-Long, ZHANG Lan-Lan, WANG Wu-Gang, MIN Yuan-Yuan, MATong, SONG Yu, GONG Yan-Jun, DOU Tao. Methanol to Propylene over Nanosheets of HZSM-5 Zeolite[J].Acta Phys. -Chim. Sin., 2014, 30(3): 535-543.

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Methanol to Propylene over Nanosheets of HZSM-5 Zeolite

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