Three-dimensionally ordered macroporous SrFeO3−δ with high surface area: Active catalysts for the complete oxidation of toluene
Three-dimensionally ordered macroporous SrFeO3−δ with high surface area: Active catalysts for the complete oxidation of toluene
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DOI：
10.1016/j.apcata.2012.03.013
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发表时间：
2012-05
影响因子：
5.5
通讯作者：
Kemeng Ji;H. Dai;Jiguang Deng;Lei Zhang;F. Wang;Haiyan Jiang;C. Au
中科院分区：
文献类型：
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作者：
Kemeng Ji;H. Dai;Jiguang Deng;Lei Zhang;F. Wang;Haiyan Jiang;C. Au
采用柠檬酸辅助聚甲基丙烯酸甲酯模板法，在乙二醇、蔗糖和赖氨酸的存在下制备了三维有序大孔（3DOM）立方钙钛矿型氧化物SrFeO 3 −δ（分别记为SFO-0、SFO-蔗糖和SFO-赖氨酸）。结果表明，SrFeO 3 −δ样品具有3DOM结构，比表面积高（34- 61 m2/g）。多孔SrFeO 3 −δ催化剂在甲苯燃烧中表现良好，其中SFO-0样品表现出最高的催化活性（在20，000 mL/（gh）下，T50%=292°C和T90%=340°C）。催化剂的催化活性与比表面积、氧吸附物种浓度、低温还原度有很好的关系，其顺序为：SFO-0> SFO-赖氨酸> SFO-蔗糖> SFO-本体。推测多孔SrFeO 3 −δ材料良好的催化性能是由于其良好的低温还原性、大的比表面积和高的氧吸附物种浓度。
Three-dimensionally ordered macroporous (3DOM) cubic perovskite-type oxides SrFeO3−δwere 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−δsamples possessed a 3DOM architecture and were high in surface area (34–61m2/g). The porous SrFeO3−δcatalysts performed well in toluene combustion, with the SFO-0 sample exhibiting the highest catalytic activity (T50%=292°C and T90%=340°C at 20,000mL/(gh)). 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−δmaterials is due to the good low-temperature reducibility, large surface area, and high oxygen adspecies concentration.