Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (6): 880-888.DOI: 10.1016/S1872-2067(14)60289-8

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Influence of Zn species in HZSM-5 on ethylene aromatization

Xuchuan Chena,b, Mei Donga, Xianjun Niua,b, Kai Wanga,b, Gang Chena,b, Weibin Fana, Jianguo Wanga, Zhangfeng Qina   

  1. a State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, Shanxi China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-11-27 Revised:2015-01-09 Online:2015-05-21 Published:2015-05-21
  • Supported by:

    This work was supported by the National Basic Research Program of China (973 Program, 2011CB201400), the National Natural Science Foundation of China (21273263, 21273264, 21227002), and the Natural Science Foundation of Shanxi Province of China (2012011005-2, 2013021007-3).

Abstract:

Zn-containing HZSM-5 zeolites with different Zn contents were prepared by ion exchange and physically mixing methods, and were characterized by X-ray diffraction, scanning electron microscope, N2 adsorption-desorption, NH3 temperature programmed desorption, pyridine adsorption infrared spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. Zn species introduced into HZSM-5 were identified as ZnO crystals, ZnO clusters in the zeolite channel and Zn(OH)+ species formed from a solid state reaction between dispersed ZnO and the protons in the zeolite. The preparation method has a significant influence on the distribution of the Zn species. The catalytic behavior of Zn-containing HZSM-5 with different Zn contents showed that the Zn(OH)+ and ZnO species were responsible for aromatic formation from ethylene.

Key words: Ethylene, Aromatization, Zn species, HZSM-5, Dehydrogenation