Book chapter
ADSORPTIVE AND CATALYTIC PROPERTIES OF CARBON-MONOXIDE AND CARBON-DIOXIDE OVER SUPPORTED METAL-OXIDES
Catalytic Activation of Carbon Dioxide, pp.102-122
ACS Symposium Series, 363
1988
DOI: 10.1021/bk-1988-0363.ch008
Abstract
The interactions of CO and CO2 with iron oxide and zinc oxide supported on SiO2, Al2O3, TiO2, MgO, and ZnO were examined using infrared spectroscopy, Mössbauer spectroscopy and water-gas shift kinetics. Ferrous cations supported on SiO2, Al2O3, and TiO2 were stable against oxidation to Fe3+ by mixtures of CO and CO2. This stability is thought to be caused by the formation of surface compounds between iron oxide and the various supports. The low activity of supported iron oxide relative to magnetite and the stability of Fe2+ on the supports suggests a change in the dominant reaction mechanism for water-gas shift from the regenerative mechanism over magnetite (Fe3O4), to the associative mechanism over the supported samples. Either CO or CO2 may interact with surface hydroxyl species to form adsorbed formate and bicarbonate species. These surface species are proposed to be intermediates for the water-gas shift reaction. Catalytic activities of the supported samples decreased as the acidity of the support or the electronegativity of the support cations increased. It is proposed that CO does not interact readily with the hydroxyl species on acidic supports.
Details
- Title: Subtitle
- ADSORPTIVE AND CATALYTIC PROPERTIES OF CARBON-MONOXIDE AND CARBON-DIOXIDE OVER SUPPORTED METAL-OXIDES
- Creators
- D G RETHWISCHJ A DUMESIC
- Resource Type
- Book chapter
- Publication Details
- Catalytic Activation of Carbon Dioxide, pp.102-122
- Series
- ACS Symposium Series; 363
- DOI
- 10.1021/bk-1988-0363.ch008
- ISSN
- 0097-6156
- Language
- English
- Date published
- 1988
- Academic Unit
- Chemical and Biochemical Engineering
- Record Identifier
- 9984231938702771
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