SURFACE RESTRUCTURING OF PALLADIUM PARTICLES INDUCED BY CO ADSORPTION

被引：22
|
作者：
ELYAKHLOUFI, MH
GILLET, E
机构：
[1] Faculté des Sciences et Techniques - Saint Jérôme, CNRS URA 797 Case 261, Marseille Cedex 13
来源：
CATALYSIS LETTERS | 1993年 / 17卷 / 1-2期
关键词：
MODEL CATALYSTS; PALLADIUM; CO CHEMISORPTION; SURFACE RECONSTRUCTION; COOPERATIVE PHENOMENON; SSIMS ANALYSIS;
D O I：
10.1007/BF00763922
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：
In order to characterize chemisorption induced reconstruction the surface of supported palladium particles (model catalyst) has been investigated during CO adsorption by SSIMS (static secondary ion mass spectrometry). The SSIMS signal ratio SIGMA(n) Pd(n)CO+/Pd(n)+ has been used to monitor the CO adsorption kinetics. The relative occupancy of linear and bridged CO sites has been determined by the value of PdCO+/(SIGMA(n) Pd(n)CO+) and the variation of the Pd-Pd next neighbour distance by plotting Pd2+/Pd+ during CO exposure. It has been shown that CO chemisorption induces a surface restructuring by increasing the Pd-Pd distance in the particle surface. This phenomenon has the features of a cooperative phenomenon. On the reconstructed particle one bonding state has been identified which appeared to be a precursor of the CO dissociation.
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页码：11 / 20
页数：10
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