Complete oxidation of benzene in eas phase by platinized titania photocatalysts

被引:122
作者
Einaga, H [1 ]
Futamura, S [1 ]
Ibusuki, T [1 ]
机构
[1] Natl Inst Adv Ind Sci & Technol, AIST Tsukuba W, Tsukuba, Ibaraki 3058569, Japan
关键词
D O I
10.1021/es001690+
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Photocatalytic oxidation of benzene in gas phase was carried out with a flow reactor at roam temperature. In a humidified airstream ([H2O] = 2.2%), benzene was quantitatively decomposed to CO2 over UV-irradiated 1.0 wt %-Pt/TiO2 catalyst. When the benzene conversion was decreased, the selectivity to CO2 was decreased, while that to CO was increased. As the amount of Pt loaded on the TiO2 catalyst was increased, the Fate of the CO photooxidation was increased, while that of benzene photooxidation was almost unchanged. These findings showed that the photooxidation of benzene to CO2 over Pt/TiO2 catalyst proceeded by the two sequential steps: (i) benzene was decomposed to CO2 and CO with the selectivities of 94% and 6%, respectively, and (ii) CO was subsequently oxidized to CO2. The rate of CO photooxidation over Pt/TiO2 catalyst was greatly decreased by the presence of benzene in the reaction gas stream. The complete oxidation of benzene to CO2 could be also achieved by using the hybrid catalysts comprising pure TiO2 and platinized TiO2.
引用
收藏
页码:1880 / 1884
页数:5
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