Photocatalytic Oxidation Processes for Toluene Oxidation over TiO2 Catalysts
Photocatalytic Oxidation Processes for Toluene Oxidation over TiO2 Catalysts
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DOI：
10.3390/catal3010219
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发表时间：
2013-03-01
期刊：
影响因子：
3.9
通讯作者：
Teraoka, Yasutake
中科院分区：
文献类型：
--
作者：
Einaga, Hisahiro;Mochiduki, Keisuke;Teraoka, Yasutake
研究了甲苯在二氧化钛催化剂上的气固相多相光氧化反应，考察了影响其催化活性的因素。甲苯在二氧化钛上的光氧化行为受二氧化钛表面中间化合物的形成和氧化行为的强烈影响，它们的积累降低了甲苯的光氧化反应速度。副产物化合物的形成和氧化行为取决于甲苯和水蒸气的初始浓度。原位傅里叶变换红外光谱(FTIR)研究表明，水蒸气促进了芳香环的裂解，促进了CO2的生成。当反应温度为300K时，催化剂上铂的沉积抑制了CO的生成，但由于中间化合物的增加，催化剂的催化活性降低。另一方面，在353K时，尽管中间化合物的含量增加，但铂/二氧化钛的催化活性高于二氧化钛。
Gas-solid heterogeneous photooxidation of toluene over TiO2 catalyst was studied to investigate the factors controlling the catalytic activities. The toluene photooxidation behavior on TiO2 was strongly affected by the formation and oxidation behavior of intermediate compounds on TiO2, and their accumulation decreased the reaction rate for toluene photooxidation. The formation and oxidation behavior of the byproduct compounds depended on the initial concentration of toluene and water vapor. In situ Fourier transform infrared (FTIR) studies revealed that water vapor promoted the cleavage of the aromatic ring and facilitated CO2 formation. At the reaction temperature of 300 K, the deposition of Pt on TiO2 suppressed CO formation, whereas catalytic activity was decreased due to the increase in the amount of intermediate compounds. On the other hand, Pt/TiO2 showed higher activity than TiO2 at 353 K, in spite of the increase of the intermediate compounds.