Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (5): 948-954.doi: 10.3866/PKU.WHXB201503111

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

In-situ Co-Precipitation of Ni-Mg-Al-LDH Catalytic Precursor on γ-Al2O3 for Dry Reforming of Methane: Synthesis and Evaluation

ZHANG Xiao-Qing1, XU Yan YAN3, YANG Chun-Hui1, ZHANG Yan-Ping1, YIN Yong-Xiang1, SHANG Shu-Yong2   

  1. 1 School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China;
    2 Institute for Chemical Engineering and Technology, Yibin University, Yibin 644000, Sichuan Province, P. R. China;
    3 School of Chemistry and Chemical Engineering, Xuzhou Institute of Technology, Xuzhou 221111, Jiangsu Province, P. R. China
  • Received:2014-11-20 Revised:2015-03-09 Published:2015-05-08
  • Contact: YIN Yong-Xiang, SHANG Shu-Yong E-mail:hyyx0675@sina.com;ssyandmltcdj@163.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (11075113) and Scientific Technology Foundation of Sichuan Province, China (2012GZ0114).

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Abstract:

A series of novel catalysts derived from Ni-Mg-Al-LDHs (LDHs: layered double hydroxides) were synthesized in-situ on γ-Al2O3 and evaluated in CO2 reforming of CH4 (dry reforming of methane, DRM) reaction system. The catalytic precursors were decomposed and reduced by calcination and an atmospheric plasma technique, respectively. Activity and stability tests showed that the catalytic properties were greatly affected by the pretreatment method. The best catalytic performance was obtained with the catalyst that was directly reduced and decomposed using an atmospheric H2/Ar plasma jet. Compared with the pure LDH precursor, Ni- Mg-Al-LDHs/γ-Al2O3 had much greater mechanical strength, because of the γ-Al2O3 support. This feature extends the long lifetime of catalyst at high temperatures. X-ray diffraction (XRD), transmission electron microscopy (TEM), N2-adsorption-desorption, and thermogravimetry-differential thermal analysis (TG-DTA) results showed that the excellent catalytic performance was based on the small particle size and uniform dispersion of active Ni crystals, as well as the high mechanical strength and large specific surface area of the catalyst.

Key words: Dry reforming of methane, Layered double hydroxide, Ni-based catalyst, Catalytic activity, Stability, Coke resistance

MSC2000: 

  • O643