Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (9): 1508-1516.DOI: 10.1016/S1872-2067(11)60424-5

• Research papers • Previous Articles     Next Articles

Effect of Calcination Temperature on Characteristics and Performance of Ni/MgO Catalyst for CO2 Reforming of Toluene

KONG Meng1, YANG Qi1, LU Wen1, FAN Zheyong1, FEI Jinhua1,*, ZHENG Xiaoming1, Thomas D. WHEELOCK2   

  1. 1Institute of Catalysis, Key Laboratory of Applied Chemistry of Zhejiang Province, Zhejiang University, Hangzhou 310028, Zhejiang, China; 2Chemical and Biological Engineering, Iowa State University, Ames 50011, USA
  • Received:2012-04-20 Revised:2012-06-12 Online:2012-09-11 Published:2012-09-11

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Abstract: A Ni/MgO catalyst for CO2 reforming of toluene was prepared by impregnating MgO with Ni(NO3)2. During calcination, some of the NiO diffused into the MgO and formed a solid solution structure of NiO-MgO, which was analyzed by Raman spectroscopy. In the temperature-programmed reduction with hydrogen analysis, only a small part of the Ni species in the outermost layer was reduced to metallic Ni at 700 oC. The calcination temperature played a key role in determining the subsequent catalytic activity of Ni/MgO, consequently the catalyst calcined at 600 oC had the highest activity. This catalyst also had the highest surface concentration of reduced Ni, which probably accounted for its high activity. During the reforming tests, a small amount of coke was deposited on Ni/MgO catalyst. Polyaromatic compounds were observed by Raman spectroscopy. The coke was probably responsible for the activity loss of Ni/MgO.

Key words: tar, carbon dioxide, reforming, nickel, magnesium oxide, supported catalyst, calcination temperature, Raman spectroscopy