The influence of support on the low-temperature activity of Pd in the reaction of CO oxidation .2. Adsorption properties and reactivity of adsorbed species

被引:36
作者
Pavlova, SN
Sadykov, VA
Razdobarov, VA
Paukshtis, EA
机构
[1] Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk
关键词
D O I
10.1006/jcat.1996.0212
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 properties of Pd supported on gamma-Al2O3, TiO2, SiO2, and adsorbed CO and oxygen low-temperature reactivities have been studied using IR spectroscopy, TPD, and pulse titration techniques. The results obtained are compared with the Pd surface structure data. At saturation coverages, weakly bound forms of CO (both linear and bridge-bonded) are the most reactive, their properties depending upon the type of support. Effect of Pd surface layer rearrangement due to CO and/or oxygen adsorption has also been found to be of importance. For mixed carbon monoxide-oxygen adlayer (theta(CO) and theta(O) are comparable), an overall Pd surface disordering occurs to wipeout all support effects. (C) 1996 Academic Press, Inc.
引用
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页码:507 / 516
页数:10
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