Infrared spectroscopic studies of CO adsorption on rhodium supported by SiO{sub 2}, Al{sub 2}O{sub 3}, and TiO{sub 2}

Journal Article · Thu Dec 01 00:00:00 EST 1994 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1994.1352· OSTI ID:47979

Trautmann, S; Baerns, M ^[1]

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1. Ruhr-Universitaet Bochum (Germany)

CO adsorption on Rh (0.5 wt%) supported by SiO{sub 2}, Al{sub 2}O{sub 3}, and TiO{sub 2} was studied by DRIFT spectroscopy at 296 K and atmospheric pressure. A support effect on the particle size distribution was evident by dominant dicarbonyl species on Rh/Al{sub 2}O{sub 3} and Rh/TiO{sub 2}, characteristic for CO adsorption on dispersed clusters, while significant proportions of linear-and bridged-bonded CO, ascribed to CO adsorbed on crystalline rhodium, were observed on Rh/SiO{sub 2}, while on Rh/Al{sub 2}O{sub 3} and Rh/TiO{sub 2} CO dissociation occurred at 296 K. CO desorption at 296 K was reductive, which led to irreversible agglomeration of rhodium clusters; in thermal CO desorption (up to 500 K), this process was strongly enhanced. 29 refs., 11 figs., 1 tab.

• OSTI ID: 47979
• Journal Information: Journal of Catalysis, Vol. 150, Issue 2; Other Information: PBD: Dec 1994
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
CARBON MONOXIDE
ADSORPTION
RHODIUM
SORPTIVE PROPERTIES
SILICA
ALUMINIUM OXIDES
TITANIUM OXIDES
CATALYST SUPPORTS
ABSORPTION SPECTROSCOPY
DESORPTION