Synthesis of flower-like Co₃O₄-CeO₂ composite oxide and its application to catalytic degradation of 1,2,4-trichlorobenzene

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• 作者：Shijing Lin ; Guijin Su ; Minghui Zheng ; Dekun Ji ; Manke Jia ; Yexuan Liu
• 关键词：Micro/nano composite material ; 1 ; 2 ; 4-Trichlorobenzene ; Catalytic degradation ; Synergistic effect ; Apparent activation energy
• 刊名：Applied Catalysis B: Environmental
• 出版年：2012
• 出版时间：23 July, 2012
• 年：2012
• 卷：123-124
• 期：Complete
• 页码：440-447
• 全文大小：1442 K

文摘

A micrometer-sized, nanostructured, flower-like Co₃O₄-CeO₂ composite oxide was synthesized by an ethylene-glycol-mediated process. The composite oxide was an assembly of polycrystalline nanoparticles, with a typical mesoporous structure. The composite's catalytic activity in 1,2,4-trichlorobenzene degradation was evaluated using a pulsed-flow microreactor-gas chromatography system, and compared with that of quartz sand, commercial CeO₂, commercial Co₃O₄, and a Co₃O₄/CeO₂ equimass mixture. The composite oxide was a promising catalyst for 1,2,4-trichlorobenzene degradation. This is attributed to the structural features of the composite oxide with a high specific surface area and a high total pore volume, and the synergistic effect between the two composite phases. The easy creation of high-mobility active oxygen on CeO₂ and the easy cleavage of CoO bonds at the interface of the two components promote reactivity of Co₃O₄ in 1,2,4-trichlorobenzene degradation. Pulsed catalytic theory suggests a first-order reaction between the composite oxide and 1,2,4-trichlorobenzene, with an apparent activation energy of about 27 kJ/mol, and degradation on the Co₃O₄-CeO₂ composite oxide would occur easily.