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- W2018441753 abstract "An idea of the formation of specific compounds over the metal surfaces has been applied to the metal surfaces during catalysis. One is the formation of c(2 × 2)-N overlayer on Pd (100). Rh(100) and Pt-Rh(100) surfaces during the reaction of NO with H2, that is, these metals make no bulk nitrides and are inactive for the adsorption of N2. These c(2×2)-N overlayers undergo the hydrogénation in the presence of H2, and the high resolution electron energy loss spectrum (HREELS) shows the formation of NHx species. Intensity of the energy loss peak for the N-H vibration depends on a half order in hydrogen pressure which indicates the establishment of an equilibration of N + 1/2H2⇄NH during the hydrogenation reaction. Another example is the formation of carbide overlayer on Ni(100) and Ni(111) surfaces. It was shown that the carbide overlayer on Ni(111) surface takes the same structure as that of the p4g carbide overlayer on Ni(100) surface, which may give a persuasive explanation to the structure insensitive methanation reaction on Ni(100) and Ni(111) surfaces. Finally, more direct evidence for the formation of surface compounds is given by the scanning tunneling microscopy (STM) works on Ag(110) surface. When Ag(110) surface is exposed to O2 at room temperature, rapid growth of AgO chain in parallel to the 〈001〉 direction was observed by STM, and the AgO chains are arranged by making p(n×1) ordered structures over the Ag(110) surface. The ordered phases of AgO chains make one-dimensional phase boundaries, and it was found that the boundary of the two phases necessarily makes a fluctuated structure. The atom model for the two-dimensional arrangement of the AgO chains proves the formation of energetically degenerated sites at the boundary, which is responsible to the fluctuated boundary structures." @default.
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- W2018441753 date "1991-04-01" @default.
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- W2018441753 title "Intermediate Compounds Formed on Metal Surfaces during Catalysis" @default.
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- W2018441753 doi "https://doi.org/10.1143/ptps.106.419" @default.
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