Catalytic Properties of Surface Sites on Metal Oxides and Their Characterization by X-Ray Photoelectron Spectroscopy
Semiannual technical rept. 1 Dec 1974-30 May 1975
PURDUE RESEARCH FOUNDATION LAFAYETTE IN
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The catalytic activity and selectivity of many oxide catalysts can be varied by controlling the oxidation state of the surface oxide. Two methods of controlling the surface states are being investigated. a The dispersion of the active catalysts on an inactive support will be varied in hopes that the stable oxidation state at given ambient conditions will be influenced by the degree of dispersion of the catalysts. b Reactions at electrode surfaces will be studied in hopes that controlled potentials applied to the electrode will influence the oxidation state of the surface sites. The success of these techniques will be determined by measuring the catalytic activity and selectivity of various reactions on the oxide catalysts and measuring the resulting surface oxides formed by x-ray photoelectron spectroscopy XPS or ESCA. The following report briefly describes research on the topic. It is divided into three sections catalytic studies, characterization of surface states by ESCA and electrode reaction studies.
- Atomic and Molecular Physics and Spectroscopy