ADSORPTION OF CO ON SMALL SUPPORTED RHODIUM PARTICLES - SSIMS AND TPD STUDY

被引：29

作者：

MATOLIN, V ^{[1
]}

MASEK, K ^{[1
]}

ELYAKHLOUFI, MH ^{[1
]}

GILLET, E ^{[1
]}

机构：

[1] CHARLES UNIV, DEPT ELECTR & VACUUM PHYS, CS-18000 PRAGUE 8, CZECHOSLOVAKIA

来源：

JOURNAL OF CATALYSIS | 1993年 / 143卷 / 02期

关键词：

D O I：

10.1006/jcat.1993.1292

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 carbon monoxide on small rhodium particles prepared by vapour deposition of Rh on either MgO or alumina supports has been investigated by static secondary ion mass spectrometry (SSIMS) and temperature-programmed desorption (TPD). Part of the CO molecularly adsorbed on clean particles undergoes dissociation during heating. The dissociation is more important for smaller particles. The intensity ratios RhnC+/Rh+n and RhnO+/Rh+n measured by SSIMS have been used to monitor the buildup of surface carbon and oxygen. Carbon recombination with oxygen followed by thermal desorption of CO is associated with the occurrence of high-temperature desorption features and with the disappearance of the carbidic and oxidic relative intensity in SSIMS. Evidence has been obtained for subsurface diffusion of oxygen. © 1993 by Academic Press, Inc.

引用

页码：492 / 498

页数：7

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