Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (12): 1955-1971.DOI: 10.1016/S1872-2067(14)60171-6

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Ni-Mg-Al solid basic layered double oxide catalysts prepared using surfactant-assisted coprecipitation method for CO2 reforming of CH4

Pengjia Tana,b, Zhihua Gaoa, Chaofeng Shenc, Yali Dua, Xiaodong Lia, Wei Huanga   

  1. a. Key Laboratory of Coal Science and Technology, Ministry of Education of China and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;
    b. The 389 Plant of the Sixth Academy of China Aerospace Science & Industry Corporation, Hohhot 010010, Inner Mongolia, China;
    c. Huadian Electric Power Research Institute, Hangzhou 310027, Zhejiang, China
  • Received:2014-04-27 Revised:2014-07-01 Online:2014-11-29 Published:2014-11-29
  • Supported by:

    This work was supported by the National High Technology Research and Development Program of China (863 Program, 2013AA051201).

Abstract:

Ni-Mg-Al solid basic catalysts for CO2 reforming of CH4 were prepared using a surfactant-assisted coprecipitation method. The preferred orientations of the surfactants on the Ni(111) and Ni(200) crystal planes were investigated. The catalytic performance of the surfactant-modified catalysts was tested at 800 ℃. The cetyltrimethylammonium bromide (CTAB)-modified catalyst (CB-LDO; LDO = layered double oxide) was further studied at various reaction temperatures. All the catalysts were characterized using Fourier-transform infrared spectroscopy, X-ray diffraction, temperature- programmed reduction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and temperature-programmed oxidation. The results show that growth of the Ni(200) plane is promoted by tetrapropylammonium hydroxide and restrained by P123, PVP, and CTAB. The crystallinity degree of Ni(200) plays a key role in the activation of CH4. The CB-LDO catalysts retain high activities and stabilities, because of the crystal phase transformation at high temperature during the reaction; this leads to the formation of spinel NiAl2O4 and exposure of the Ni(200) crystal plane.

Key words: Surfactant, Coprecipitation method, Nickel, Magnesium aluminum oxide, Methane, Carbon dioxide, Reforming