Three-dimensionally ordered macroporous SrFeO3-δ with high surface area: Active catalysts for the complete oxidation of toluene

Three-dimensionally ordered macroporous (3DOM) cubic perovskite-type oxides SrFeO3-delta were prepared using the citrate acid-assisted poly(methyl methacrylate)-templating method in the presence of ethylene glycol, sucrose or L-lysine (denoted as SFO-0. SFO-Sucrose, and SFO-Lysine, respectively). It is found that the SrFeO3-delta samples possessed a 3DOM architecture and were high in surface area (34-61 m(2)/g). The porous SrFeO3-delta catalysts performed well in toluene combustion, with the SFO-0 sample exhibiting the highest catalytic activity (T-50% = 292 degrees C and T-90% = 340 degrees C at 20,000 mL/(g h)). The catalytic activity of the samples showed a good relationship with surface area, oxygen adspecies concentration, and low-temperature reducibility, all decrease in the order of SFO-0 > SFO-Lysine > SFO-Sucrose >> SFO-bulk. It is deduced that the good catalytic performance of the porous SrFeO3-delta materials is due to the good low-temperature reducibility, large surface area, and high oxygen adspecies concentration. (C) 2012 Elsevier B.V. All rights reserved.