Citation: WEI Chun-Lei, GAO Jie, WANG Kai, DONG Mei, FAN Wei-Bin, QIN Zhang-Feng, WANG Jian-Guo. Effect of Hydrogen pre-treatment on the catalytic properties of Zn/HZSM-5 zeolite for ethylene aromatization reaction[J]. Acta Physico-Chimica Sinica, ;2017, 33(7): 1483-1491. doi: 10.3866/PKU.WHXB201704133 shu

Effect of Hydrogen pre-treatment on the catalytic properties of Zn/HZSM-5 zeolite for ethylene aromatization reaction

WEI Chun-Lei ^1,2, ,
GAO Jie ^1,2 ,
WANG Kai ^1,2 ,
DONG Mei ¹ ,
FAN Wei-Bin ¹ ,
QIN Zhang-Feng ¹ ,
WANG Jian-Guo ¹

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China;
2.
University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Received Date: 16 February 2017
Revised Date: 3 April 2017

Fund Project: The project was supported by the National Natural Science Foundation of China (21273264, 21273263), Major State Basic Research Development Program of China (973) (2011CB201403) and Natural Science Foundation of Shanxi Province, China (2012011005-2).

After hydrogen pre-treatment at different temperatures, the textural and physicochemical properties of Zn/HZSM-5 were studied by X-ray diffraction (XRD), N2 adsorption-desorption, Fourier transform infrared (FT-IR) spectroscopy, temperature programmed desorption of NH3 (NH3-TPD), and X-ray photoelectron spectroscopy (XPS) techniques. The results showed that the temperatures for hydrogen pretreatment of Zn/HZSM-5 exerted a significant influence on both the contents and state of zinc species. The pre-treatment with hydrogen at temperature higher than 600℃ resulted in a significant leaching of zinc species from the catalysts, which occurred due to the reduction and sublimation of zinc species. The XPS characterization revealed that the hydrogen pre-treatment at different temperatures causes the redistribution of ZnOH⁺ and ZnO species in the zeolite. A linear correlation between the amount of ZnOH⁺ species and the selectivity to aromatics over the Zn/HZSM-5 catalysts pretreated with hydrogen at different temperatures was observed, suggesting that ZnOH⁺ species may promote the formation of aromatics in ethylene aromatization reaction.
- Molecular sieves,
- Ethylene aromatization,
- Hydrogen pretreatment,
- Zn species
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