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Perovskite-type oxides were successfully prepared using malic acid method, characterized by TG/DTA, XRD, XPS, TEM and H2-TPR and their catalytic activities for the combustion of benzene were determined. Almost of catalyst showed pe- rovskite crystalline phase and 15-70 nm particle size. The LaMnO3 catalysts showed the highest activity and the conversion reaches almost 100% at 350 ℃. The catalysts were modified to enhance the activity through substitution of metal into the A or B site of the perovskite oxides. In the LaMnO3-type catalyst, the partial substitution of Sr into site the A-site enhanced the catalytic activity in the benzene combustion. In addition, the partial substitution of Co or Cu into site the B-site also enhanced the catalytic activity and the catalytic activity was in the order of Co > Cu > Fe in the LaMn1-xBxO3 (B = Co, Fe, Cu) type catalyst.

Catalytic Combustion of Benzene over Perovskite-type Oxides Prepared Using Malic Acid Method