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.

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Literature Abstracts

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.