Three-dimensionally ordered macroporous SrFeO_{3鈭?span style='font-style: italic'>未} with high surface area: Active catalysts for the complete oxidation of toluene

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• 作者：Kemeng Ji^a ; Hongxing Dai^a ; ^{hxdai@bjut.edu.cn} ; Jiguang Deng^a ; Lei Zhang^a ; Fang Wang^a ; Haiyan Jiang^a ; Chak Tong Au^b ; ^{pctau@hkbu.edu.hk}
• 关键词：Colloidal crystal templating preparation method ; Three-dimensional ordered macroporous perovskite-type oxide ; Oxygen-deficient strontium ferrite ; Low-temperature reducibility ; Toluene combustion
• 刊名：Applied Catalysis A ; General
• 出版年：2012
• 期刊代码：4_0926860x
• 类别：ch
• 出版时间：28 May, 2012
• 卷：425-426
• 期：Complete
• 页码：153-160
• 文件大小：2080 K

摘要

Three-dimensionally ordered macroporous (3DOM) cubic perovskite-type oxides SrFeO_3鈭?em>未 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 SrFeO_3鈭?em>未 samples possessed a 3DOM architecture and were high in surface area (34-61 m²/g). The porous SrFeO_3鈭?em>未 catalysts performed well in toluene combustion, with the SFO-0 sample exhibiting the highest catalytic activity (T_50% = 292 掳C and T_90% = 340 掳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 鈮?#xA0;SFO-bulk. It is deduced that the good catalytic performance of the porous SrFeO_3鈭?em>未 materials is due to the good low-temperature reducibility, large surface area, and high oxygen adspecies concentration.