Thermodynamics of chemisorption: induced surface segregation in binary alloys |
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| Affiliation: | 1. School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea;2. Department of Applied Chemical Engineering, Chonnam National University, Yongbong 300, Buk-gu, Kwangju 500-757, Republic of Korea;1. Chemical & Process Technology Division, Korea Research Institute of Chemical Technology, 141, Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea;2. Department of Chemical and Biomolecular Engineering, Sogang University, 35, Baekbeom-ro, Mapo-gu, Seoul 04107, Republic of Korea;1. N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russian Federation;2. G. K. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russian Federation |
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| Abstract: | Numerical results are presented for the segregational behaviour in the hydrogen-adsorbed NixCui1-x alloy system in which the equilibria of adsorption and segregation are treated in a self-consistent manner. For the powdered systems the nickel atoms are found to segregate to the surface in the presence of H adatoms. In crystalline alloy systems the Cu atoms segregate to the surface, but the amount of Cu segregation in the presence of H adatoms is less than that for a clean alloy surface. |
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