FTIR spectroscopic study of CO adsorption on Rh-ZSM-5:: detection of Rh+-CO species

被引：31

作者：

Hadjiivanov, K ^{[1
]}

Ivanova, E

Dimitrov, L

Knözinger, H

机构：

[1] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, BU-1113 Sofia, Bulgaria

[2] Bulgarian Acad Sci, Inst Catalysis, BU-1113 Sofia, Bulgaria

[3] LMU Munchen, Dept Chem, D-81377 Munich, Germany

来源：

JOURNAL OF MOLECULAR STRUCTURE | 2003年 / 661卷

关键词：

adsorption; Rh-ZSM-5; dicarbonyls; monocarbonyls of Rh+; FTIR spectroscopy; carbon monoxide;

D O I：

10.1016/j.molstruc.2003.09.007

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 of CO on Rh-ZSM-5 results in the appearance of Rh+(CO)(3) species (2181, 2118 and 2084 cm (-1)) which are converted into Rh+(CO)(2) gem-dicarbonyls (2115 and 2048 cm (-1)) with decreasing CO equilibrium pressure. Evacuation of the sample at elevated temperatures leads to a decrease in intensity of the Rh+(CO)2 bands. However, short evacuations (2-3 s) at high temperatures (673-783 K) and quenching to ambient temperature result in the appearance of a weak band at 2101 cm (-1) which is assigned to linear Rh+-CO species. The reasons for the formation of these species under special conditions are discussed. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：459 / 463

页数：5

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