Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (8): 1392-1402.DOI: 10.1016/S1872-2067(15)60953-6

• Articles • Previous Articles    

Methanol to hydrocarbons reaction over HZSM-22 and SAPO-11: Effect of catalyst acid strength on reaction and deactivation mechanism

Jinbang Wanga,b,d, Jinzhe Lib, Shutao Xub, Yuchun Zhib, Yingxu Weib, Yanli Heb, Jingrun Chenb,d, Mozhi Zhangb,d, Quanyi Wangb, Wenna Zhangb,d, Xinqiang Wub,d, Xinwen Guoa, Zhongmin Liub,c   

  1. a State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;
    b National Engineering Laboratory for Methanol to Olefins, State Energy Low Carbon Catalysis and Engineering R&D Center, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    c State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    d University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2015-05-26 Revised:2015-07-09 Online:2015-07-29 Published:2015-07-30
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (201473182, 21273005, 21273230, 21103180).

Abstract:

The conversion of methanol to hydrocarbons has been investigated over HZSM-22 and SAPO-11. Both of these catalysts possess one-dimensional 10-ring channels, but have different acidic strengths. Comparison studies and 12C/13C isotopic switching experiments were conducted to evaluate the influence of the acidic strength of the catalyst on the conversion of methanol, as well as its deactivation mechanism. Although the conversion of methanol proceeded via an alkene methylation-cracking pathway over both catalysts, the acidity of the catalysts had a significant impact on the conversion and product distribution of these reactions. The stability of the catalysts varied with temperature. The catalysts were deactivated at high temperature by the deposition of graphitic coke on their outer surface. Deactivation also occurred at low temperatures a result that the pores of the catalyst were blocked by polyaromatic compounds. The co-reaction of 13C-methanol and 12C-1-butene confirmed the importance of the acidity of the catalyst on the distribution of the hydrocarbon products.

Key words: HZSM-22, SAPO-11, Methanol-to-hydrocarbon, Acid strength, Mechanism