Carbon dioxide reforming of methane to synthesis gas over LaNi _1-xCr _xO ₃ perovskite catalysts

Carbon dioxide reforming of methane was investigated over LaNi _1-xCr _xO ₃ perovskite catalysts which were prepared by the malic acid method. The respective perovskite catalysts were a single phase of perovskite oxide without impurity phases. Their reduction behavior was characterized by temperature programmed reduction. In the LaNi _1-xCr _xO ₃ perovskite catalysts, the catalytic activities were closely related to the reduction behavior of the catalysts, and the partial substitution of Cr to the B-site of perovskite catalysts promoted stability against reduction. When the x values were lower than 0.4, the LaNi _1-xCr _xO ₃ perovskite catalysts were decomposed to La ₂O ₃ and Ni and the decomposition of perovskite structure led to large coke deposition. When the x values were higher than 0.4, the LaNi _1-xCr _xO ₃ perovskite catalysts showed reduced catalytic activity but became stable to reduction and coke formation in the reforming reaction.