Catalytic Reforming of Methane with Carbon Dioxide on LaBO3 (B = Co, Ni, Fe, Cr) Catalysts.

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  • Wu Yunying
    Department of Applied Chemistry, Faculty of Engineering, Saitama University
  • Kawaguchi Osamu
    Department of Applied Chemistry, Faculty of Engineering, Saitama University
  • Matsuda Tsuneo
    Department of Applied Chemistry, Faculty of Engineering, Saitama University

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  • Catalytic Reforming of Methane with Car

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The reforming reactions of CH4 with CO2 diluted with He on perovskite structural oxides, LaBO3 (B = Co, Ni, Fe, Cr), were examined. The reaction activity at 1073 K followed the order LaCoO3 > LaNiO3 > LaFeO3 > LaCrO3, and the highest selectivities to CO and H2 were obtained on a LaCoO3 catalyst. The reaction on the LaCoO3 catalyst under the reaction condition of CH4/CO2 = 1 showed a H2/CO ratio of 1; the ratio was less than 1 on other catalysts. In the initial stage of the reactions of CH4 + CO2 on LaCoO3 and LaNiO3 catalysts, an induction period accompanying the reduction of the catalysts was observed. During the reforming reaction, both the LaCoO3 and LaNiO3 catalysts were decomposed by reduction to Co to Ni metal and La2O3. No induction period, however, was observed in the reaction on the LaFeO3 and LaCrO3 catalysts, which were stable during the reaction. The high activity of the decomposed LaCoO3 catalyst is ascribed here —as a result of EPMA, SEM analysis and of comparison with the reaction behaviors of Co catalysts supported on La2O3 — to the high concentration of metallic cobalt uniformly dispersed as fine particles on the catalyst surface. The reaction mechanism on the cobalt metal was inferred from the results of the reaction of CH4 or CO2 alone on the decomposed LaCoO3 catalyst.

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