• 关键词：挥发性有机物  甲苯  催化燃烧  Cu-Mn复合氧化物  尖晶石

• 基金项目：

• 李鹏
• 湘潭大学环境工程系, 湘潭 411105

• 童志权
• 湘潭大学环境工程系, 湘潭 411105

• 黄妍
• 湘潭大学环境工程系, 湘潭 411105

• 张俊丰
• 湘潭大学环境工程系, 湘潭 411105

• 摘要：采用浸渍法制备了CuMn/TiO₂新型甲苯燃烧催化剂,其活性明显优于传统CuMn/γ-Al₂O₃和Cu-Mn复合氧化物催化剂.研究发现,载体TiO₂自身有一定催化活性,而γ-Al₂O₃则几乎没有活性;TiO₂与Cu-Mn之间的协同作用更提高了新型催化剂的活性.XRD、LRS结果显示,CuMn/TiO₂催化剂的主要活性相为铜锰尖晶石(CuMn₂O₄),它的存在是CuMn/TiO₂催化活性优良的另一个主要原因.考察了Cu-Mn负载量、铜锰比和焙烧温度对催化剂活性的影响,CuMn/TiO₂下对甲苯的去除率达95%以上时催化床层温度为215℃,比CuMn/γ-Al₂O₃和Cu-Mn复合氧化物对甲苯去除率达95%时分别下降了30℃、50℃左右.

• Abstract：A new type of TiO₂-supported Cu-Mn mixed oxides catalysts was prepared by solution impregnation and applied to the total oxidation of toluene.The catalyst was found to be more active than conventional catalysts such as CuMn/γ-Al₂O₃ and Cu-Mn mixed oxides etc.Unlike γ-Al₂O₃,TiO₂ alone was found to have some activity for toluene oxidation,although its T₅₀ is rather higher(300℃).The synergetic effect of Cu-Mn and TiO₂ also promoted the catalytic activity of the prepared catalysts.XRD and LRS analysis revealed that the major active material of CuMn/TiO₂ is CuMn₂O₄,which greatly improves the activity of CuMn/TiO₂.The effects of the loading of Cu-Mn mixed oxides,the molar ratio of Cu to Mn and the calcination temperature on toluene conversion were investigated.CuMn/TiO₂,in particular,could catalyze the complete oxidation of toluene at a temperature as low as 220℃,which is 30℃ lower than CuMn/γ-Al₂O₃.

• Key words：VOCs  toluene  catalytic combustion  copper-manganese complex oxide  spinel

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