氢预处理对Zn/HZSM-5分子筛催化乙烯芳构化反应性能的影响

doi:10.3866/PKU.WHXB201704133

Abstract

Abstract:

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.

Key words: Molecular sieves, Ethylene aromatization, Hydrogen pretreatment, Zn species

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

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

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