Coadsorption of NO and other small gases (H2 and CO) on polycrystalline rhodium surface |
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Authors: | Hirofumi Miki Toshihide Kioka Koji Kawasaki |
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Affiliation: | Department of Physics, Faculty of Science and Technology, Science University of Tokyo, Noda, Chiba 278, Japan |
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Abstract: | The coadsorption of NO and other small gases (H2 and CO) on a polycrystalline Rh filament has been studied by thermal desorption mass spectroscopy, using 15NO. The sample was exposed to a mixture of nitric oxide and other gases with various concentrations of 15NO at room temperature. It is indicated that NO, CO and H2 coadsorbs on the rhodium surface, and NO desorbs as N2 and O2. NO is adsorbed mainly in the dissociation at lower coverage and molecular adsorption becomes dominant at higher coverage. But the amount of desorbed O2 was very small. The chemisorption of CO is affected by the chemisorbed NO. Thermal desorption of hydrogen is detected when the value of P15NO/PCO is very small. The hydrogen adsorbed on the rhodium surface is replaced by NO with a longer exposure time. |
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