Catalytic oxidation of CO on Rh/SiO/sub 2/: a rapid-response fourier transform infrared transient study
The catalytic oxidation of CO has been studied over Rh/SiO/sub 2/ by using a rapid transient response FTIR-mass spectrometric technique. The reactivity of linearly adsorbed CO was found to be considerably greater than that of the dicarbonyl species at both 85 and 200/sup 0/C. The frequency of linearly adsorbed CO was observed to undergo a continuous red shift during the duration of the transient, suggesting the formation of a mixed CO-oxygen adlayer. Induction times required for the formation of gas-phase CO/sub 2/ were found to be nearly 2 orders of magnitude lower than those observed for Pt/SiO/sub 2/ and Pd/SiO/sub 2/. Self-sustained CO-O/sub 2/ oscillations reinforce the greater reactivity of linearly adsorbed CO. H/sub 2/-CO-O/sub 2/ transient studies also suggest the formation of mixed hydrogen-CO adlayers. Hydrogen was observed to react with the dicarbonyl species to form a hydridocarbonyl species. The CO which is displaced by hydrogen reacts rapidly with chemisorbed oxygen to form CO/sub 2/.
- Research Organization:
- Univ. of Illinois, Chicago (USA)
- DOE Contract Number:
- FG02-86ER13531
- OSTI ID:
- 5218007
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:6; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
500100 -- Environment
Atmospheric-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION SPECTROSCOPY
ADSORPTION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
DATA
ELEMENTS
EXPERIMENTAL DATA
FOURIER TRANSFORM SPECTROMETERS
HIGH TEMPERATURE
INFORMATION
INFRARED SPECTRA
MASS SPECTROSCOPY
MEASURING INSTRUMENTS
MEDIUM TEMPERATURE
METALS
MINERALS
NONMETALS
NUMERICAL DATA
OXIDATION
OXIDE MINERALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PLATINUM METALS
RHODIUM
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SPECTRA
SPECTROMETERS
SPECTROSCOPY
TRANSITION ELEMENTS