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In situ IR study on adsorption and oxidation of toluene on supported Cu catalyst

LIU Ya-ning1, HUANG Hai-tao2, LI Xin-jun1, SUN Shi-cai1, ZHAO Dai-qing1(1 Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China; 2 Environment Science and Engineering Institute, Guangdong University of Technology, Guangzhou 510090, China)  
The present paper intends to introduce the authors' study of the adsorption of toluene on pure support alumina and supported copper catalyst through in situ infrared spectroscopic analysis respectively. For this purpose, we have studied the function of the pure support and active element as well as the process of adsorption and oxidation of toluene on catalyst on the condition of rich and lean oxygen case by case. Our research results indicate that the adsorption of toluene on catalyst Cu/γ-Al_2O_3 is very weak. And, therefore, the middle-way product of oxidation of toluene - benzoic acid - can form so strong adsorption on the surface of the catalyst Cu/γ-Al_2O_3 that the deep oxidation of benzoic acid may turn to be the rate-controlling factor of toluene's deep oxidation .It can also be found that copper oxide may act as the key active element in the catalyst Cu/γ-Al_2O_3.
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