2601.     PEASE, R. N., AND STEWART, L.  Catalytic Activity and Adsorptive Power of Supported Iron, Cobalt, Nickel, Copper, and Silver.  Jour. Am. Chem. Soc., vol. 49, 1927, pp. 2783-2787; Chem. Abs., vol. 22, 1928, p. 345.

        Samples from a uniform supply of diatomite brick were impregnated with solutions of the nitrates of Fe, Co, Ni, Cu, and G, in the proportions of 1 gm.-atom of metal per 100 gm. of dry brick, in order to insure that the differences in catalytic activity of the supported catalysts thus prepared might be due only to the specific properties of the metal in question.  The apparatus, the static method of measuring the catalytic activity of these catalysts for the hydrogenation of C₂H₄, and the method of measuring the adsorption of H₂ and C₂H₄ were the same as previously described in abs. 2599.  Co and Ni caused instantaneous hydrogenation of C₂H₄ at –20°; Fe was moderately active at 0°, Cu at 50°, and Ag at 100°.  Much more H₂ was adsorbed by Ni and Co than by the other metals, and more C₂H₄ by Fe.  Reaction velocity measurements with Ag at 100° and Cu show that the rate is proportional to the H₂, and independent of the C₂H₄ concentration.  With Fe at 0°, excess H₂ increases the rate, while excess C₂H₄ has little effect.  An association, rather than a dissociation theory of catalytic hydrogenation, is indicated.