title: Catalytic combustion of benzene over nanosized LaMnO3 perovskite oxides.
abstract: In this study, LaMnO3 perovskite type oxides were successfully prepared using the malic acid method. The oxides were characterized by TG/DTA, XRD, XPS, TEM and H2-TPR and their catalytic activities for the combustion of benzene were determined. Almost all of the catalysts showed perovskite crystalline phase and had a particle size of 15-60 nm. The LaMnO3 catalysts prepared with more than 1.0 mol of malic acid showed the highest activity and the conversion reached almost 100% at 310 degrees C. The catalysts were modified to enhance the activity by substituting the metal at the A or B site of the perovskite oxides. In the LaMnO3-type catalyst, the partial substitution of Sr into site A enhanced the catalytic activity during benzene combustion. In addition, the partial substitution of Co into site B also increased the catalytic activity and the catalytic activity was in the following order: Co > Cu > Fe in the LaMn1_xBxO3(B = Co, Fe, Cu) type catalysts.
authors.affiliation: Department of Chemical Engineering, Pukyong National University, 100 Yongdang-dong, Nam-ku, Busan, 608-739, Korea.
authors.forename: Won Young
authors.initials: WY
authors.lastname: Jung
authors.forename: Kwon Taek
authors.initials: KT
authors.lastname: Lim
authors.forename: Gun Dae
authors.initials: GD
authors.lastname: Lee
authors.forename: Man Sig
authors.initials: MS
authors.lastname: Lee
authors.forename: Seong-Soo
authors.initials: SS
authors.lastname: Hong