Gas-phase photooxidation of trichloroethylene on TiO2 and ZnO:: Influence of trichloroethylene pressure, oxygen pressure, and the photocatalyst surface on the product distribution

被引：99

作者：

Driessen, MD ^{[1
]}

Goodman, AL ^{[1
]}

Miller, TM ^{[1
]}

Zaharias, GA ^{[1
]}

Grassian, VH ^{[1
]}

机构：

[1] Univ Iowa, Dept Chem, Iowa City, IA 52242 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1998年 / 102卷 / 03期

关键词：

D O I：

10.1021/jp972351e

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：

Transmission Fourier transform infrared spectroscopy has been used to identify gas-phase and surface-bound products and intermediates formed during the gas-phase photooxidation of trichloroethylene (TCE) on TiO(2) and ZnO. Several factors are found to influence the gas-phase product distribution for this reaction. On clean TiO(2) and ZnO surfaces and at high TCE and O(2) pressures, gas-phase CO, CO(2), COCl(2), CCl(2)HCOCl, CHCl(3), C(2)HCl(5), and HCl are produced, whereas at low TCE and O(2) pressures, TCE is converted to gas-phase CO and CO(2) only. In addition to TCE and O(2) pressure, the product distribution of the photooxidation of TCE is strongly dependent upon the coverage of adsorbed species on the surface of the photocatalyst. It is shown here that the complete oxidation of adsorbed TCE can occur on clean photocatalytic surfaces whereas only partial oxidation of adsorbed TCE occurs on adsorbate-covered surfaces. The role of adsorbed surface products in TCE photooxidation is discussed.

引用

页码：549 / 556

页数：8

共 29 条

[1] WIDE TEMPERATURE-RANGE IR SPECTROSCOPY CELL FOR STUDIES OF ADSORPTION AND DESORPTION ON HIGH AREA SOLIDS [J].