Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (3): 535-543.doi: 10.3866/PKU.WHXB201401032

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Methanol to Propylene over Nanosheets of HZSM-5 Zeolite

ZHANG Shao-Long, ZHANG Lan-Lan, WANG Wu-Gang, MIN Yuan-Yuan, MATong, SONG Yu, GONG Yan-Jun, DOU Tao   

  1. State Key Laboratory of Heavy Oil Processing, The Key Laboratory of Catalysis, China National Petroleum Corporation, College of Chemistry Engineering, China University of Petroleum-Beijing, Beijing 102249, P. R. China
  • Received:2013-11-29 Revised:2014-01-02 Published:2014-02-27
  • Contact: GONG Yan-Jun E-mail:gongyj@cup.edu.cn
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2012CB215002), National Natural Science Foundation of China (21276278, 21176255), and China National Petroleum Corporation (CNPC) Program (2011A-2101).

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