Catalytic properties of LaNiO3 and Mn-modified LaNiO3 catalysts for oxidation of CO and benzene

ABO3-type perovskite oxides containing transition metals at the B site are effective catalysts for oxidation reactions. In this study, LaNiO3 was prepared by the hydrolysis-precipitation method, and LaNiO3 was modified with Mn by the impregnation method. LaNiO3 showed higher CO oxidation activity than LaCoO3, LaMnO3, and LaFeO3. The high activity of LaNiO3 was attributed to the reactivity of the lattice oxygen in LaNiO3, as confirmed by temperature-programmed reduction by H2 (H2-TPR) and CO-TPR studies. The Mn-modified LaNiO3 exhibited higher activity for benzene oxidation than LaNiO3. The CO oxidation properties of the Mn-modified LaNiO3 catalysts correlated with their H2-reduction properties, whereas benzene oxidation properties were improved by the increasing amount of Mn on the catalyst surface.