• 关键词：Cu-Mn-Ti/GS催化剂  二甲苯  石墨烯  催化活性  降解动力学

• 基金项目：浙江省自然科学基金（No.LY16E080001）

• 王淑媛
• 浙江工商大学环境科学与工程学院, 杭州 310018

• 李济吾
• 浙江工商大学环境科学与工程学院, 杭州 310018

• 洪亚军
• 金华华东环保设备有限公司, 金华 321016

• 摘要：采用水热法制备了4种不同摩尔比的Cu-Mn-Ti/GS复合物催化剂，利用固定式反应床评价了其对二甲苯的催化氧化性能，并对催化剂进行了BET、XRD、SEM、TEM、XPS等表征，探讨了其对二甲苯的降解动力学。结果表明，当催化剂的Cu、Mn含量增加时，其比表面积有所降低，总孔容也降低，降解活性减小。催化剂中Cu-Mn呈现Cu_1.5Mn_1.5O₄和CuMn₂O₄两种晶格，活性组分有Cu⁺、CuMnO和TiO₂。石墨烯载体的稳定性较好，Ti-Cu-Mn/GS（1∶1∶1）催化剂的颗粒分布较均匀，粒径也较小，降解二甲苯的T₅₀为97 ℃，表现出较好的低温催化降解性能。催化剂对二甲苯的催化氧化降解过程符合一级反应动力学方程。

• Abstract：Four kinds of Ti-Cu-Mn/GS catalysts with different atomic ratio were prepared by hydrothermal method. The catalytic activity for xylene were evaluated in the fixed reactor. The catalysts were characterized by using BET, XRD, SEM, TEM and XPS. The degradation kinetics of xylene with Cu-Mn-Ti/GS (1:1:1) was discussed. It is concluded that the specific surface area and the pore volume of the catalysts decreased with the increasing of the proportion of Cu-Mn composite oxides, which decreased the catalytic activity of xylene. Cu and Mn in the catalysts emerged as Cu_1.5Mn_1.5O₄ and CuMn₂O₄. The major active substances in the catalyst were Cu⁺, CuMnO and TiO₂. Graphene carrier had good stability. The particle size distribution of Ti-Cu-Mn/GS(1:1:1) catalysts was rather uniform, and its average particle size had less. The T₅₀ of the catalyst in the process of catalytic oxidation for xylene was 97 ℃, which had good catalytic activity at low temperature. The degradation kinetics of xylene for Cu-Mn-Ti/GS(1:1:1) catalysts accords with the first-order kinetics.

• Key words：Cu-Mn-Ti/GS catalysts  xylene  graphene  catalytic activity  degradation kinetics

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