3545.     VAN ITTERBEEK, A.  [Relation Between Adsorption and the Catalytic Activity of Metals.]  Mededeel. Koninkl. Viaam. Acad. Wetenschap., Belg., Klasse Wetenschap., vol. 3, No. 10, 1941, pp. 3-20; Chem. Zentralb., 1942, II, p.742; Chem. Abs., vol. 37, 1943, p. 4958.

        On the very pure Ni film the adsorption of H2 and CO at temperatures up to 500 and pressures below 1 mm. was studied with the help of a thermal-conductivity gage.  At ordinary temperature, activated adsorption of H2 occurs; at higher temperatures, this increases and is apparently not to be attributed to diffusion adsorption.  Comparison of the H2 and CO isobars shows that at 167 and 329 the ratio of H2:CO is 3:1 and at 2 other temperatures the ratio is 2:1, corresponding, respectively, to the synthesis of CH4 and benzene.  It is concluded that the occurrence of this stoichiometric surface ratio is related to the surface reaction.  On a copper film, neither H2 nor CO is adsorbed until a small quantity of Th is electrodeposited.  In this instance also, temperatures exist at which the H2:CO ratio is 3:1 and also those in which it is 2:1.