43a.  ANDERSON, R. B., KRIEG, A., AND FRIEDEL, R. A.  Fischer-Tropsch Synthesis—Differential Reaction Rate Studies With Cobalt Catalyst.  Ind. Eng. Chem., vol. 41, 1949, pp. 2,189-2,197; Chem. Abs., vol. 44, 1950, p. 2,358.

              Synthesis was studied on a pelletted Co : ThO₂ : kieselguhr (100 : 18 : 100) catalyst in a fixed-bed reactor (90 cm. long bed) at atmospheric pressure and 186°-207°.  The reactor contained a special tube for the removal of gas samples at 9 points along the length of the bed.  About 5% A was added to the feed gas as a reference component.  Synthesis gases containing H₂ : CO ratios of 3.5. 2. and 0.9 were used at space velocities ranging from 25-100 cc. of gas per cc. of total catalyst bed per hr.  With all gas compositions the synthesis rate was high in the first 10% of the bed and lower and essentially constant in the remainder of the bed until the reactants were nearly completely consumed.  The gas compositions in the bed in the region of constant synthesis rate varied considerably.  CH₄ appears to be formed by primary reactions as well as by hydrocracking of higher hydrocarbons; the latter being favored by high H₂ and hydrocarbon partial pressures.  CO₂ appears to be formed by primary reactions as well as by a secondary water-gas shift which latter was favored by high CO and H₂O partial pressures.  CO₂ was reduced in the synthesis gas after CO had been completely consumed.  Craxford’s postulate (abs. 639) that the synthesis occurs on Co₂C with secondary reactions on Co atoms does not appear adequate to explain the data reported.

              ANDERSON, R. B., HALL, W. K., HEWLETT, H., and SELIGMAN, B.  Studies of the Fischer-Tropsch Synthesis.  II.  Properties of Unreduced Cobalt Catalysts.  See abs. 45.

  ANDERSON, R. B., HOFER, L. J. E., COHN, E. M., and SELIGMAN, B.  Studies of the Fischer-Tropsch Synthesis.  IX.  Phase Changes of Iron Catalysts in the Synthesis.  See abs. 48.

              ANDERSON, R. B., KRIEG, A., FRIEDEL, R. A., and MASON, L. S.  Studies of the Fischer-Tropsch Synthesis.  VI.  Differential Reaction Rate Studies With Cobalt Catalyst.  See abs. 49.