Kinetic studies of oxidation of ethylene over a TiO2 photocatalyst

被引：146

作者：

Yamazaki, S ^{[1
]}

Tanaka, S ^{[1
]}

Tsukamoto, H ^{[1
]}

机构：

[1] Yamaguchi Univ, Dept Chem, Fac Sci, Yamaguchi 7538512, Japan

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 1999年 / 121卷 / 01期

关键词：

photocatalysis; ethylene; kinetics; titanium dioxide;

D O I：

10.1016/S1010-6030(98)00448-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The photo-assisted catalytic degradation of ethylene was studied in the tubular photoreactor packed with TiO2 pellets prepared by sol-gel method. The dependence of the reaction rate on the light intensity, feed composition (ethylene, oxygen and water vapor) and temperature were investigated. More than 95% ethylene was always completely mineralized irrespective of the reaction conditions. The reaction rate for ethylene conversion was greatly suppressed when the water vapor mole fraction was increased in the reactant gas stream. The rate determining step is the oxidation of C2H4OH radicals with oxygen on the catalyst surface. The rate law is expressed as follows to account for the results obtained: - d[C2H4]/dt = k(9)K(8)I(a)phi KC2H4PC2H4KO2PO2/k(OH)(1 + KC2H4PC2H4 + KH2OPH2O)(1 + K-O2 P-O2). (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：55 / 61

页数：7

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