Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (12): 1960-1970.DOI: 10.1016/S1872-2067(18)63147-X

• Articles • Previous Articles     Next Articles

Investigation of the coupled reaction of methyl acetate and n-hexane over HZSM-5

Kuo Yanga,b, Jinzhe Lia,c, Xiao Zhangb, Zhongmin Liua   

  1. a National Engineering Laboratory for Methanol to Olefins, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b College of Science, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
    c University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-07-24 Revised:2018-07-26 Online:2018-12-18 Published:2018-09-26
  • Contact: 10.1016/S1872-2067(18)63147-X
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21303264, 21576256, 21273005), the Science Foundation Research Funds Provided to New Recruitments of China University of Petroleum, Beijing (YJRC-2013-49), the Basic Academic Research Funds of China University of Petroleum, Beijing (2462015YQ0601).

Abstract:

The coupled reaction of methyl acetate and n-hexane was carried out over a HZSM-5 catalyst. In addition to a thermal coupling effect, systematic variations in the product distribution were also observed in the coupled system. The bezene-toluene-xylene (BTX) selectivity was remarkably improved while the H2, CO, and CO2 selectivity decreased. Rapid deactivation of the catalyst was observed, caused by the extremely high reactivity of methyl acetate, which was alleviated after adding n-hexane. These results indicated that a coupling effect exists in this system. A detailed pathway for the coupled system is suggested based on the analysis of the surface species, carbonaceous species deposited on the catalyst, as well as the product selectivity changes. The good match between the "hydrogen deficiency" of methyl acetate and the "hydrogen richness" of n-hexane is consistent with the observed coupling effect.

Key words: Methyl acetate, n-Hexane, Coupled reaction, HZSM-5