CO adsorption on supported Pd catalysts studied by adsorption microcalorimetry and temperature programmed desorption

被引：70
|
作者：
Dropsch, H [1 ]
Baerns, M [1 ]
机构：
[1] RUHR UNIV BOCHUM,LEHRSTUHL TECH CHEM,D-44780 BOCHUM,GERMANY
来源：
APPLIED CATALYSIS A-GENERAL | 1997年 / 158卷 / 1-2期
关键词：
CO adsorbed on silica-; alumina- and titania-supported Pd; TPD of CO from differently supported Pd; heats of CO adsorption; linear and bridge-bonded CO(ads) species on supported Pd; influence of Pd loading and type of support material on adsorption and dissociation of CO; analysis of surface carbon by TPSR in H-2;
D O I：
10.1016/S0926-860X(96)00418-8
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 CO on silica-, alumina- and titania-supported Pd catalysts (2, 5, and 10 wt% Pd) has been studied by adsorption microcalorimetry and temperature programmed desorption (TPD) experiments in a flow system at atmospheric pressure. On supported Pd catalysts, bridge-bonded CO was found to be the dominant CO(ads) spec:es. The observed influence of Pd loading on CO adsorption energetics was explained in terms of particle size and/or surface structure of the Pd crystallites. Support materials can be divided into active (TiO2, Al2O3) and inert (SiO2) supports, where Pd catalysts with active supports are characterized by (1) an increased sensitivity of CO adsorption to reduction temperature, (2) promotion of CO dissociation, and (3) an increased activity of surface carbon towards hydrogenation, as compared to Pd catalysts supported on inert silica.
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页码：163 / 183
页数：21
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