FTIR study of adsorption and reactions of methyl formate on powdered TiO2

被引：121

作者：

Chuang, CC ^{[1
]}

Wu, WC ^{[1
]}

Huang, MC ^{[1
]}

Huang, IC ^{[1
]}

Lin, JL ^{[1
]}

机构：

[1] Natl Cheng Kung Univ, Dept Chem, Tainan 70101, Taiwan

来源：

JOURNAL OF CATALYSIS | 1999年 / 185卷 / 02期

关键词：

FTIR; methyl formate; TiO2; adsorption; photochemistry;

D O I：

10.1006/jcat.1999.2516

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：

Adsorption, thermochemistry, and photochemistry of methyl formate on powdered TiO2 have been studied by Fourier-transformed infrared spectroscopy. Methyl formate is adsorbed on the TiO2 surface in two forms. One is molecularly adsorbed methyl formate showing a red-shifted carbonyl stretching. The other is a structure-reorganized species showing absorption bands at 2841, 2866, and 2942 cm(-1) in the CHx stretching region. An orthoester-type intermediate is proposed to explain the observed infrared absorption bands. In the thermal reactions, all the detected carbon-containing gas products are derived from CH3O(a) and HCOO(a), which are generated as surface intermediates in the process of methyl formate decomposition. In methyl formate photochemistry, both O-2 and TiO2 are essential. The origins of the gas products relating to the adsorbed species are also discussed. (C) 1999 Academic Press.

引用

页码：423 / 434

页数：12

共 62 条

[1]

[Anonymous], 1990, DEGUSSA TECHNICAL B, V56, P13

[2] PHOTOFORMATION AND STRUCTURE OF O-2- AND NITROGEN-CONTAINING ANION RADICALS ADSORBED ON HIGHLY DISPERSED TITANIUM-OXIDE ANCHORED ONTO POROUS VYCOR GLASS [J].