Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (01): 76-80.doi: 10.3866/PKU.WHXB20040116

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Influence of La2O3 and CeO2 Promoters on Physico-chemical Properties and Catalytic Performance of Ni/MgO Catalyst in Methane Reforming with Carbon Dioxide

Chen Ji-Xiang;Qiu Ye-Jun;Zhang Ji-Yan;Su Wan-Hua   

  1. Department of Catalysis Science and Engineering, School of Chemical Engineering and Technology, Tianjin University; State Key Laboratory of C1 Chemistry and Chemical Technology; National Engine Combustion Laboratory, Tianjin University, Tianjin 300072
  • Received:2003-05-28 Revised:2003-08-14 Published:2004-01-15
  • Contact: Chen Ji-Xiang E-mail:jxchen@tju.edu.cn

Abstract: Three catalysts, NiO-MgO, NiO-La2O3-MgO and NiO-CeO2-MgO containing 10%(w) Ni were prepared by the co-precipitation method. The effects of La2O3 and CeO2 on physico-chemical properties and catalytic performance of NiO-MgO catalysts were studied by means of BET, XRD, TPR, XPS, TG and reaction activity evaluation. It was found that NiO formed a nickel-magnesia solid solution with MgO, and La2O3 and CeO2 promoters improved the resistance to sintering of the nickel-magnesia solid solution, which was attributed to the higher specific surface area and smaller size of crystallites of the Nickel-magnesia solid solution. Besides, La2O3 and CeO2 could promote reduction of nickel species in nickel-magnesia solid solution, especially CeO2. Under reaction conditions of CH4/CO2=1(molar ratio), 0.1 MPa, 1023 K and 1073 K, 18 L•g-1•h-1, NiO-La2O3-MgO and NiO-CeO2-MgO showed higher activity than NiO-MgO. However, the three catalysts had similar activity at 1123 K because the reaction was close to the thermodynamic equilibrium under these reaction conditions. La2O3 and CeO2 act as a structural promoter and an electronic promoter respectively to improve the properties of NiO-MgO.

Key words: Methane reforming with carbon dioxide, Nickel-magnesian solid solution