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 1577.    ---------------.  [IPATIEFF, V. N.]  Mixed Catalysts.  Nat. Petrol. News, vol. 32, No. 32, 1940, pp. R-280-282; Petrol. Refiner, vol. 19, 1940, p. 250-255; Science, vol. 91, 1940, pp. 605-608; Chem. Abs., vol. 34, 1940, p. 6512.

       According to a theory formulated by Ipatieff, increased activity is not explained satisfactorily as a purely physical effect of the promoters resulting in arrested recrystallization and preservation of the surface.  Experiments with promoted catalysts led this author to conclude that a new source of energy contributes to catalysis.  He assumes that contact of the metallic promoter with the basic catalyst produces electric energy.  Ipatieff believes that the metallic oxide promoters participate in the reaction according to their chemical nature, thus assisting the catalyst in utilizing the reaction energy.  This would mean, for instance, that ThO₂ in a Co-ThO₂-kieselguhr catalyst acts not only by its stabilizing influence on the specific structure of the catalyst but actually takes part in the reaction as a dehydrating agent. An activating agent may thus operate by physical, chemical, or physicochemical means.

       See abs. 3091a.