784.    EIDUS, Y. T., AND ALTSHULLER, S. B.  [Investigation of Catalysts for Hydrogenation of Carbon Monoxide by Simultaneous Use of the Dynamic and Static Methods.  II.  Activity of Catalysts Containing Various Components of the Catalyst Fe-Cu-ThO₂-K₂CO₃-Kieselguhr.]  Bull. Acad. Sci. U.R.S.S., Classe Sci. Chim., 1944, pp. 249-357; U.O.P. Co. Survey Foreign Petroleum Literature Transl., May 1945, No. 507; Chem. Abs., vol. 39, 1945, p. 3142.

     12 Catalysts containing varying combinations of the components of the complex catalyst Fe-Cu-ThO₂-K₂CO₃-kieselguhr made up in proportion of 100:25; 2:2:125 have been investigated by a combined method with respect to their activity in hydrogenation of CO and interaction of CO with the catalytic surface at 258°.  It was established that only those catalysts that contain both Fe and Cu as well as one of the promoters, either ThO₂ or K₂CO₃, are active in the process discussed.  However, addition of the 2d promoter brings about a sharp rise in the activity of the catalyst.  In both processes studied, the change in the initial velocity of the process is well correlated with the composition of the catalyst.  These data, in conjunction with those previously reported (abs. 783) justify an assumption that synthesis of hydrocarbons from CO and H₂, over Fe catalysts, involves carbide formation as an intermediate step, which does not take place over Co or Ni catalysts.  The dependence of velocity of the total process of hydrogenation of CO to hydrocarbons on the Fe-Cu-ThO₂-K₂CO₃-kieselguhr catalyst in the above proportions upon the temperature was studied in a static system.  The apparent energy of activation within 245° and 265° was found to amount to 28.7 calories per mole.  The pre-exponential member of the Arrhenius equation is diminished at temperatures above 255°, which may be due to formation of new reaction products resulting in a decrease of the number of active centers on the surface of the catalyst that participate in the basic reaction.