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《Chinese Journal of Catalysis》 2004-01
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Reaction Mechanism of Gas-Phase Photocatalytic Oxidation of Benzene on TiO_2

ZHANG Qiancheng 1,2 , ZHANG Fengbao 1* , ZHANG Guoliang 1(1 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; 2 School of Chemical Engineering, Inner Mongolia Polytechnic University, Huhehot 010062, Inner Mongolia, China)  
Gas phase photocatalysis is an effective way for decomposing toxic organics, but the studies on benzene decomposition are relatively little. Our objective was to assess the capability of TiO 2 to decompose benzene and establish reaction mechanism for the photocatalytic oxidation of benzene. The photocatalytic oxidation of benzene in gas phase was performed in a recirculation photoreactor including a UV lamp emitting around 254 nm and TiO 2 coated glass plate. When the initial mass concentration of benzene was 50 mg/m 3, it was almost decomposed completely after 460 min on 0 1 g of TiO 2 and 0 013 m 2 area of catalyst layer activated by ultraviolet. The reaction time was reduced from 460 to 240 min when the irradiated area was 0 026 m 2. At ambient temperature, the adsorption of benzene on TiO 2 surface was not obvious, but the intermediate reaction product had very good adsorptivity, occupied the active sites and deactivated the catalyst. The IR results showed that the intermediate product was a hexatomic ring alcohol. A probable photocatalytic oxidation mechanism of benzene in gas phase was inferred through the intermediate based on the experiment and the results in the literature. The gas phase photocatalytic oxidation of benzene had different reaction mechanisms under different reaction conditions.
【Fund】: “十五”国家医学科技攻关项目 (2 0 0 1BA70 4B0 2 )
【CateGory Index】: O643.3
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