Coadsorption of carbon monoxide and hydrogen on polycrystalline rhodium |
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Affiliation: | 1. Paul Scherrer Institute, Laboratory for Scientific Computing and Modeling, CH-5232 Villigen PSI, Switzerland;2. Paul Scherrer Institute, Energy System Integration Platform, CH-5232 Villigen PSI, Switzerland;3. University of Applied Sciences and Arts Northwestern Switzerland, Institute of Bioenergy and Resource Efficiency, CH-5210 Windisch, Switzerland |
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Abstract: | The coadsorption of carbon monoxide and hydrogen on polycrystalline rhodium filament has been studied by thermal desorption mass spectrometry. From a series of thermal desorption spectra of CO and H2 from rhodium as a function of the exposure time to the gas mixture of CO and H2, it is indicated that there are a single broad peak for CO and three peaks designated as β1, β2, β3 for hydrogen. Thermal desorption of hydrogen is complex. CO and β1-hydrogen coadsorb on the rhodium surface with their partial pressures in the initial stage of the exposure to the gas mixture and then the β1 -hydrogen adsorbed on the surface is replaced by CO with the further exposure time. The kinetics for the replacement of β1-hydrogen by CO may be discussed from the standpoint of the L-H reaction process. The β2-and β3-hydrogen are observed with a longer exposure time after the elimination of β1 -hydrogen. It may be suggested that the β3-hydrogen peak is attributed to the desorption of hydrogen absorbed in the bulk. The nature of β2 -hydrogen is also briefly mentioned in possible implications. |
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