Download Advances in Catalysis, Vol. 7 by W.G. Frankenburg, V.I. Komarewsky, E.K. Rideal (Eds.) PDF

By W.G. Frankenburg, V.I. Komarewsky, E.K. Rideal (Eds.)

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72 References. 72 Since in any catalytic reaction, at least one of the reactants must be chemisorbed, no theory of catalysis can be constructed before the mechanism of chemisorption on the surfaces under investigation is fully understood. I n recent years, as a result of the advances in solid-state physics, it became apparent that an important group of adsorbents and catalysts, namely the oxides of the transition metals, were typical semiconductors. This simple idea stimulated both research and speculation in the catalytic field.

12. , J. Znsl. Metals 36, 309 (1926). 13. , “The Metallic State,” p. 328. Oxford, London, 1931. 14. , Proc. Roy. Soc. A147, 396 (1934). 15. , Phys. Rev. 64, 899 (1938). 16. , J. Am. Chem. 69, 542 (1947). 17. , Proc. Roy. A196, 343 (1949). 18. Trapnell, B. M. , Proc. Roy. A218, 566 (1953). 19. , Advances in CataZysis. 2, 151 (1950). 20. Emmett, P. , 12th Report of Comm. on Contact Catalysis 68, New York, 1940. No. 8, 172 (1950). 21. , and Eley, D. , Discussions Faraday SOC. 22. Eley, D. , Quart.

Beeck (31) has observed on metal films an increase in hydrogenation activity with decreasing strength of the hydrogen-metal bond, the heat of hydrogen adsorption being used as an indication of the bond strength. It is suggested th a t if hydrogen adsorption on the metal oxides involves either the formation of positive ions or covalent bonds, an electron excess will presumably decrease th e strength of bonding. Thus, in view of Beeck’s work, the observed increase in activity would be explainable.

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