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 1332.    ---------------.  [HALL, C. C., AND SMITH, S. L.] Hydrocarbon Synthesis in the Presence of Cobalt Catalysts at Medium Pressures.  Jour. Inst. Petrol., vol. 33, 1947, pp. 439-459; Chem. Abs., vol. 42, 1948, p. 735.

        Effect of a pressure of 150 p.s.i. on the synthesis of hydrocarbons from H2 and CO with a Co:ThO2:MgO:kieselguhr catalyst was studied.  Conversion with synthesis gas (H2:CO=2:1) was about 10% greater, and the rate of catalyst deterioration was 30-50% less than at atmospheric pressure.  Improvement in performance over that at atmospheric pressure was not as marked as Fischer and Pichler obtained with their Co:ThO2:kieselguhr catalyst, abs. 1011.  Treatment with H2 at synthesis temperatures did not lengthen the life of the catalyst; reduction treatment at higher temperatures did not bring improvement under medium-pressure conditions.  Catalyst with a high Co content per unit of volume produced an excessive amount of gaseous hydrocarbons at 150 p.s.i.  This was corrected by using water gas (H2:CO=1.2:1) instead of the synthesis gas.  Gas production was reduced from 45 to 17 gm. per m.3 of inert free charge, and at the same time, the production of nongaseous hydrocarbons was reduced only from 134 to 130 gm. per m.3 of charge.  The olefin content of the fraction b. 30°-150° was increased by the reduction of H2 in the charge 8-53%.  The highest conversion to liquid and solid hydrocarbons was obtained with a H2:CO ratio of 1.5:1.  In the first few weeks of the catalyst’s life the conversion was 85% of the charge.