An Infrared Study of the Hydrogenation of Carbon Dioxide on Supported Rhodium Catalysts.
AUBURN UNIV AL DEPT OF CHEMISTRY
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An infrared study of the methanation of CO2 on supported Rh catalysts has been performed. This reaction has been shown to occur over these catalysts with higher turnover frequency at a given temperature and Rh loading than does the methanation of CO. A support effect has been demonstrated for the reaction over the supported Rh catalysts TiO2 Al2O3 SiO2 in reactivity. A key surface intermediate during the methanation reaction is a carbonyl hydride species, as evidenced by a prominent infrared band in the 2020-2040cm region which shifts by 5-10cm when D2 is substituted for H2 in the reaction mixture. This carbonyl hydride species can be produced in the absence of H2 by migration of H from the support to Rh. The dissociation of CO2 on supported Rh has been shown to be enhanced by the presence of H2 and impurity boron. Originator-supplied keywords include Infrared spectroscopy, Carbon dioxide, Hydrogenation, Methanation, and Supported rhodium catalysts.
- Organic Chemistry
- Atomic and Molecular Physics and Spectroscopy