Surface composition of PdAu and PdAg catalysts by auger electron spectroscopy |
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Authors: | Bernard J Wood Henry Wise |
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Institution: | Solid-State Catalysis Laboratory, Stanford Research Institute, Menlo Park, California 94025, U.S.A. |
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Abstract: | Auger electron spectroscopy (AES) has been employed to examine the metal surface composition of PdAu and PdAg alloys as microspheres and as alumina-supported crystallites. For the PdAu system the observed PdAu ratios at the surface correspond closely to those of the bulk both for the microspheres and crystallites. However in the case of supported PdAg, the surface exhibits silver-enrichment relative to the bulk. By means of the regular solution monolayer model the results are interpreted theoretically and the binding energies between the dissimilar metal atoms are computed. |
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