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The effect of oxygen on the chemisorption on polycrystalline silver surface

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Abstract

The adsorption of oxygen(O2) and the effect of oxygen on the chemisorption of water(D2O) and hydrogen(D2) on polycrystalline silver surface have been studied using the technique of thermal desorption spectroscopy(TDS) under ultra-high vacuum(UHV) condition. Three different states of adsorbed oxygen are observed on the surface. The adsorptions and reactions of water and hydrogen on the oxygendosed surface are strongly affected by the pre-adsorbed oxygen. Water on the oxygen-dosed surface shows a maximum desorption at 430K. During the adsorption of hydrogen on the oxygen-dosed surface, hydrogen is rapidly oxidized by a stepwise reaction in which hydrogen reacts first with O(a) to yield hydroxyl intermediate[OD(a)] and then this intermediate reacts to form water. The rate-determining step in this reaction is desorption of water.

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Abbreviations

EELS:

electron energy loss spectroscopy

k1, k2, k3, k4, k′:

rate coefficient of the corresponding reaction

L:

a unit of gas exposure, Torrsec

O(a), OD(a), OH(a):

surface state of the corresponding species

TDS:

thermal desorption spectroscopy

UHV:

ultra-high vacuum

[H2], [O(a)], [OH(a)]:

concentration of the corresponding species

α Β1 Β2 :

name of the corresponding peak in thermal desorption spectrum of oxygen

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Authors and Affiliations

  1. Department of Chemical Technology, Seoul National University, 151-742, Seoul, Korea

    Y.E. Sung, W. Y. Lee, H.K. Rhee & H.I. Lee

  2. Department of Chemical Engineering, Seoul National University, 151-742, Seoul, Korea

    W. Y. Lee & H.K. Rhee

Authors
  1. Y.E. Sung
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  2. W. Y. Lee
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  3. H.K. Rhee
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  4. H.I. Lee
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Sung, Y., Lee, W.Y., Rhee, H. et al. The effect of oxygen on the chemisorption on polycrystalline silver surface. Korean J. Chem. Eng. 6, 300–305 (1989). https://doi.org/10.1007/BF02705218

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  • DOI: https://doi.org/10.1007/BF02705218

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