Infrared study on the interaction of CO with alumina-supported rhodium

F. Solymosi, Helmut Knözinger

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

The interaction of CO with alumina-supported Rh has been investigated by infrared spectroscopy at 85-573 K. The oxidative disruption of Rh crystallites occurred at temperatures as low as 150 K. Desorption and readsorption of CO at low temperature demonstrated that there is a stable Rh+(CO)2 species which releases CO only at 573 K. The desorption of CO from Rh+ is mainly reductive but a certain fraction of Rh+ escapes reduction even during desorption at high temperatures, 473-573 K. The reductive agglomeration of Rh+ induced by CO occurs at 473 K. At 573 K the process is almost irreversible, which means that such large crystallites are produced that they cannot be disintegrated and oxidized again to Rh+ by CO and OH groups at room temperature. Hydrogen adsorbed on Rhx greatly retards the oxidative disruption process at low temperature which is attributed to the formation of Rh carbonyl hydride.

Original languageEnglish
Pages (from-to)389-395
Number of pages7
JournalJournal of the Chemical Society - Faraday Transactions
Volume86
Issue number2
DOIs
Publication statusPublished - 1990

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Rhodium
Aluminum Oxide
Carbon Monoxide
rhodium
aluminum oxides
desorption
Infrared radiation
crystallites
Desorption
interactions
agglomeration
hydrides
escape
Crystallites
infrared spectroscopy
Temperature
room temperature
hydrogen
Hydrides
Hydrogen

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Infrared study on the interaction of CO with alumina-supported rhodium. / Solymosi, F.; Knözinger, Helmut.

In: Journal of the Chemical Society - Faraday Transactions, Vol. 86, No. 2, 1990, p. 389-395.

Research output: Contribution to journalArticle

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