Diffuse reflectance FT-IR studies of the adsorption of CO on Rh/Al/sub 2/O/sub 3/ catalysts
The diffuse reflectance/FT-IR spectrum of CO/Rh/Al/sub 2/O/sub 3/ system has been investigated in terms of pretreatment of the catalyst, Rh loading, CO pressure (coverage), and coadsorptionof CO with oxygen. The widths of all bands were narrowed by Fourier self-deconvolution (FSD), and six types of CO/Rh adsorbed species, including two which have not been assigned previously, have been identified by their C-O stretching frequencies. Species I, assigned to Rh(I)(CO)/sub 2/, is formed with isolated RH atoms and/or edge Rh atoms of atomic ''rafts'' and/or atomic crystallites. Species II is assigned to Rh(O)-CO. Species III' is assigned to (Rh(O))/sub 2/CO. Species VI is assigned to (Rh(I))/sub 2/CO. Two new species-IIIa, assigned to (Rh(O))/sub 3/CO, with underlying Rh atom, and Vi', assigned to (Rh(I))/sub 2/ (CO)/sub 3/-are postulated.
- Research Organization:
- Department of Chemistry, Ohio University, Athens, Ohio 45701 (I.M.H.); and Department of Chemistry, University of California, Riverside, California 92521 (P.R.G.)
- OSTI ID:
- 6510591
- Journal Information:
- Appl. Spectrosc.; (United States), Journal Name: Appl. Spectrosc.; (United States) Vol. 41:4; ISSN APSPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400102* -- Chemical & Spectral Procedures
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL ANALYSIS
ELEMENTS
INFRARED SPECTRA
METALS
NONMETALS
OPTICAL PROPERTIES
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLATINUM METALS
REACTION INTERMEDIATES
RHODIUM
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SPECTRAL REFLECTANCE
SURFACE PROPERTIES
SURFACES
TRANSITION ELEMENTS