PM oxidation over Ag-loaded perovskite-type oxide catalyst prepared by thermal decomposition of heteronuclear cyano-complex precursor

The Ag-loaded perovskite-type oxide catalysts (Ag/LaFeO₃-CN and Ag/LaFeO₃-imp) were prepared using two different methods, and their catalytic activities for carbon combustion were examined. Ag loading was observed to exhibit a positive effect on the catalytic activity of carbon combustion for an Ag/LaFeO₃-CN catalyst that was prepared by the calcination of an Ag-loaded heteronuclear metal cyano-complex precursor. However, Ag loading was not observed to be significantly effective in case of Ag/LaFeO₃-imp that was prepared by a general impregnation method. Such a noticeable enhancement in the activity of an Ag/LaFeO₃-CN catalyst was assumed to originate from both the high dispersion of Ag that was loaded on LaFeO₃ and from the formation of reactive oxygen species between metallic Ag species and the perovskite-type oxide.