METHANATION SITES ON A PT/TIO2 CATALYST

被引：37

作者：

MAO, TF

FALCONER, JL

机构：

[1] Department of Chemical Engineering, University of Colorado, Boulder

来源：

JOURNAL OF CATALYSIS | 1990年 / 123卷 / 02期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0021-9517(90)90141-6

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 adsorption of Hz and CO and the hydrogenation of CO were studied by temperature-programmed desorption and reaction (TPD, TPR) on a 1.8% Pt/TiO2 catalyst. Two types of adsorbed CO were observed: CO is adsorbed on Pt and a HCO complex is adsorbed on the TiO2 support. support. The HCO complex, which appears to be a methoxy (CH3O) species, hydrogenates at a faster rate than does the CO on Pt. Isotope labeling indicates that the methoxy species may be directly hydrogenated to CH4. The CO transfers rapidly from Pt to TiO2 at methanation temperatures and below. The effects of H2 pressure and adsorption temperature on the methanation rate during during TPR are presented. The higher rate of hydrogenation of the CH3O species adsorbed on the support (relative to CO adsorbed on Pt) may be related to the enhanced methanation activity of Pt/TiO2 catalysts at steady state. © 1990.

引用

页码：443 / 455

页数：13

共 19 条

[1] ENHANCED ACTIVITY OF PD/TIO2 CATALYSTS FOR THE CO-H-2 REACTION IN THE ABSENCE OF STRONG METAL-SUPPORT INTERACTIONS (SMSI) [J].