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−δ 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−δ samples possessed a 3DOM architecture and were high in surface area (34–61 m2/g). The porous SrFeO3−δ catalysts performed well in toluene combustion, with the SFO-0 sample exhibiting the highest catalytic activity (T50% = 292 °C and T90% = 340 °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−δ materials is due to the good low-temperature reducibility, large surface area, and high oxygen adspecies concentration.

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► 3DOM SrFeO3−δ with high surface areas are prepared by the PMMA-templating method.
► Surfactant addition results in increase of 3DOM SrFeO3−δ surface area.
► 3DOM SrFeO3−δ are high in surface area and Oads content and good in reducibility.
► 3DOM SrFeO3−δ catalysts perform well in the combustion of toluene.
► Surface area, Oads content, and reducibility account for the good catalytic activity.