Oxide-supported Rh particle structure probed with carbon monoxide

被引：48

作者：

Frank, M ^{[1
]}

Kühnemuth, R ^{[1
]}

Bäumer, M ^{[1
]}

Freund, HJ ^{[1
]}

机构：

[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

来源：

SURFACE SCIENCE | 1999年 / 427-28卷

关键词：

aluminum oxide; carbon monoxide; chemisorption; clusters; infrared absorption spectroscopy; rhodium; surface defects; vibrations of adsorbed molecules;

D O I：

10.1016/S0039-6028(99)00281-2

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：

Rh deposits in a wide range of metal exposures have been grown on a thin, well-ordered alumina film under ultrahigh vacuum conditions. Their morphologies range from individual Rh particles with sizes below ten atoms to closed metal films, as determined by scanning tunneling microscopy (STM). CO chemisorption on these deposits has been studied by infrared reflection absorption spectroscopy (IRAS) and X-ray photoelectron spectroscopy (XPS). At low metal coverages, the formation of isolated Rh carbonyl species associated with surface defects is observed. Changes in the infrared spectra of CO adsorbed on annealed Rh aggregates are attributed to a thermally induced ordering of the Rh particle surface on a local scale, leading to a reduction in the number of low coordinated metal atoms. This is accompanied by a marked decrease of the CO chemisorption capacity. Adsorbed CO reduces the extent of this ordering process, while the adlayer itself reorganizes. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：288 / 293

页数：6

共 22 条

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