Adsorption of carbon monoxide on manganese-promoted rhodium/silica catalysts As studied by infrared spectroscopy

Journal Article · Thu Feb 22 04:00:00 EST 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100367a066· OSTI ID:6730732

Stevenson, S A; Knoezinger, H ^[1]; Lisitsyn, A ^[2]

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1. Universitaet Muenchen (Germany, F.R.)
2. Institute of Catalysis, Novosibirsk (USSR)

Infrared spectroscopy was used to study the adsorption of carbon monoxide on silica-supported rhodium catalysts promoted with manganese oxide. Addition of the promoter suppressed overall adsorption, weakened the adsorption of the linear CO species, and created a broad new absorption band with a maximum near 1715 cm{sup {minus}1}; this new low-frequency band is thought to be due to a tilted Rh-C-O-Mn species. On the promoted catalyst both the new low-frequency species and the linear CO species react with hydrogen much more rapidly than does the linear species on the unpromoted catalyst. Additionally, the promoted catalyst does not chemisorb CO at 80 K; adsorption on this catalyst is an activated process, and maximum adsorption is observed only when the sample is exposed to CO at 373 K. This increase in adsorption is believed to be caused by a reconstruction of the manganese oxide overlayer.

• OSTI ID: 6730732
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:4; ISSN JPCHA; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
BIMETALS
CALCULATION METHODS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
DATA
DATA ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
INFRARED SPECTRA
MANGANESE
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
MINERALS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
RHODIUM
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SPECTRA
TRANSITION ELEMENTS