• three-dimensionally ordered macroporous srfeo3−δ with high surface area: active catalysts for the complete oxidation of toluene

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     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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