Chem. J. Chinese Universities ›› 2016, Vol. 37 ›› Issue (1): 134.doi: 10.7503/cjcu20150389

• Physical Chemistry • Previous Articles     Next Articles

Effect of Fuel on Structure and Catalytic Performance for Slurry Methanation over Ni-Al2O3 Catalysts Prepared by Combustion Method

JI Keming, MENG Fanhui, GAO Yuan, LI Zhong*()   

  1. Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2015-05-14 Online:2016-01-10 Published:2015-12-20
  • Contact: LI Zhong E-mail:lizhong@tyut.edu.cn
  • Supported by:
    † Supported by the Youth Foundation of Shanxi Province, China(No.2013021007-4), the China Postdoctoral Science Foundation(No.2013M541210) and the National Basic Research Program of China(No.2012CB723105)

Abstract:

A series of Ni-Al2O3 catalysts was prepared by impregnation combustion method and co-combustion method, and the catalysts were characterized by N2 adsorption-desorption, XRD, TEM, H2-TPR and H2 chemisorption. The effect of fuel type on structure and catalytic methanation performance over Ni-Al2O3 catalysts in a slurry-bed reactor was studied. The results show that Ni-Al2O3 catalysts, prepared by impregnation combustion method using urea, glycine or ethylene glycol as fuel, exhibited similar textural properties, metallic Ni dispersion and Ni crystallite size as those of the support, and the CO conversion was between 80.1% and 83.5% at 260 ℃. However, the Ni-Al2O3 catalysts, prepared by co-combustion method, were significantly affected by the combustion process. The specific surface area of the catalysts prepared using glycine and ethylene glycol as fuel was small, and the metallic Ni dispersion was low and Ni crystallite size was large, which resulted in the low CO conversion. The Ni-Al2O3 catalyst using urea as fuel exhibited the large specific surface area and metallic Ni dispersion and small Ni crystallite size, and the CO conversion and CH4 selectivity reached 84.7% and 91.1%, respectively.

Key words: Slurry-bed methanation, Ni-Al2O3 catalyst, Impregnation combustion method, Co-combustion method, Fuel

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