Abstract:

Cu-Mn-Ce(CMC) ternary mixed oxides were prepared by the co-precipitation method with different precipitants, and evaluated in catalytic combustion of toluene. The catalyst prepared with NaOH(CMC-NaOH)exhibited the highest catalytic activity, followed by the catalyst prepared with NH₃•H₂O, K₂CO₃, and Na₂C₂O₄. The precursors of hydroxide derived from NaOH had strong interaction, and Cu, Mn ions more easily entered the lattice of CeO₂ fluorite structure to form CeO₂ solid solution during calcination. As a result, the structure containing Cu-Mn mixed oxides and CeO₂ solid solution enhanced the mobility of active oxygen owing to abundant defective sites on the surface, which benefited catalytic combustion of toluene.

Key words: catalytic combustion, VOCs, Cu-Mn-Ce oxide, co-precipitation, catalyst, oxidation, organic compounds

摘要：

为了避免柠檬酸溶胶-凝胶法制备过程中环境问题, 采用共沉淀法制备了Cu-Mn-Ce复合氧化物催化剂, 以催化燃烧甲苯为模型反应, 考察了沉淀剂对Cu-Mn-Ce催化结构和性能的影响。结果表明, 以NaOH作为沉淀剂催化剂效果最佳, 其次为NH₃·H₂O、K₂CO₃、Na₂C₂O₄。采用NaOH作为沉淀剂, 氢氧化物前体在焙烧活化过程中更易使Cu、Mn离子进入CeO₂的立方结构, 形成具有缺陷结构的CeO₂固溶体, 从而提高了表面氧浓度和活动性, 在燃烧反应中表现出更优异的催化特性。

关键词: 催化燃烧, VOCs, Cu-Mn-Ce复合氧化物, 共沉淀, 催化剂, 氧化, 有机化合物