1443. HOFER, L. J. E., AND PEEBLES, W. C. X-Ray Diffraction Studies of the Carburization of a Cobalt-Thoria-Kieselguhr Fischer-Tropsch Catalyst. Am. Chem. Soc., 111th Meeting Abs., 1947, p. 1-E.

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Literature Abstracts

1443. HOFER, L. J. E., AND PEEBLES, W. C. X-Ray Diffraction Studies of the Carburization of a Cobalt-Thoria-Kieselguhr Fischer-Tropsch Catalyst. Am. Chem. Soc., 111^th Meeting Abs., 1947, p. 1-E.

Catalyst containing Co-ThO₂-kieselguhr (100:18:100) was prepared essentially by the method of Fischer and Koch, reduced with H₂ at 400°, and then treated with CO at 210°. The reaction was followed gravimetrically in the manner of Bahr and Jessen. At 210° the weight increase owing to carburization stopped when the ratio C:Co in the catalyst was nearly the same as that in Co₂C. The C deposited at 210° could be rapidly converted to CH₄ and traces of higher hydrocarbons by treatment with H₂ at 210°. X-ray diffraction analysis showed that the ThO₂ and kieselguhr in the catalyst were amorphous, as was also the Co oxide before reduction. After reduction, however, the Co was in the form of cubic β-Co, which is the form stable above about 360°. No trace of any hexagonal a-Co lines could be detected. Upon carburization, lines of a new phase appeared, which previously have been identified as owing to a new Co carbide. After hydrogenation of the carburized catalyst, the lines of hexagonal a-Co appeared.