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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Photocatalytic Degradation of Chlorinated Ethanes in the Gas Phase on the Porous TiO2 Pellets: Effect of Surface Acidity
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Photocatalytic Degradation of Chlorinated Ethanes in the Gas Phase on the Porous TiO2 Pellets: Effect of Surface Acidity

机译：多孔TiO2颗粒上气相中氯代乙烷的光催化降解：表面酸度的影响

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摘要

The photocatalytic degradation of chlorinated ethanes was studied in a tubular photoreactor packed with TiO2 pellets prepared by sol-gel method. The steady-state condition was not obtained, but the deterioration in the photocatalytic activity was observed during the irradiation. Effects of mole fractions of water vapor, O2, and C2H5Cl or C2H4Cl2 and reaction temperature on the photodegradation of C2H5Cl or C2H4Cl2 were examined, and these data were compared with those obtained by the photodegradation of chlorinated ethylenes. On the basis of the products detected with and without oxygen in the reactants gas stream, we proposed the degradation mechanism. Measurement of diffuse reflectance infrared Fourier transform spectroscopy of pyridine adsorbed on the catalysts showed that decrease in the conversion for the photodegradation of C2H5Cl was attributable to the formation of Brnsted acid sites. Comparison of the data obtained with the TiO2 and the sulfated TiO2 (SO4 2-/TiO2) pellets indicated that the photodegradation of C2H5Cl was suppressed by the presence of the Brnsted sites, but that of trichloroethylene was not affected. Such a difference is attributable to the adsorption process of these reactants on the acid sites on the catalyst surface.
机译：在装有溶胶-凝胶法制备的TiO2颗粒的管状光反应器中研究了氯化乙烷的光催化降解。没有获得稳态条件，但是在照射期间观察到光催化活性的劣化。研究了水蒸气，O2和C2H5Cl或C2H4Cl2的摩尔分数以及反应温度对C2H5Cl或C2H4Cl2光降解的影响，并将这些数据与通过氯化乙烯光降解获得的数据进行了比较。根据反应气流中有氧和无氧的产物，我们提出了降解机理。吸附在催化剂上的吡啶的漫反射红外傅里叶变换光谱的测量表明，C2H5Cl光降解的转化率降低归因于布朗斯台德酸位的形成。与TiO2和硫酸化TiO2（SO4 2- / TiO2）颗粒获得的数据比较表明，布朗斯台德位点的存在抑制了C2H5Cl的光降解，但三氯乙烯的光降解不受影响。这种差异可归因于这些反应物在催化剂表面酸位上的吸附过程。

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