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Published August 1979 | Published
Book Section - Chapter Open

Two‐Dimensional Phase Separation: Co-Adsorption of Hydrogen and Carbon Monoxide on the (111) Surface of Rhodium

Abstract

The co‐adsorption of CO and H_2 on Rh(111) at low temperature (∼ 100 K) has been studied using thermal desorption mass spectrometry (TDS) and Low‐Energy Electron Diffraction(LEED). The probability of adsorption of CO on rhodium pretreated with hydrogen has been found to decrease slowly with increasing amounts of hydrogen on the surface. In addition, the effect of surface hydrogen on the CO LEED patterns indicates segregation of hydrogen and CO. These results can be explained in terms of a strong repulsive CO–H interaction and a mobile precursor model of CO adsorption.

Additional Information

© 1980 American Institute of Physics. Research supported by the National Science Foundation under Grant No. CHE77-16314.

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