1455. HOFMANN, U. [Deposition of Carbon From Carbon Monoxide and Benzine in the Presence of Iron. I.] Ber. deut. chem. Gesell., vol. 61, B, 1928, pp. 1180-1195; Chem. Abs., vol. 22, 1928, p. 4289.

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Literature Abstracts

1455. HOFMANN, U. [Deposition of Carbon From Carbon Monoxide and Benzine in the Presence of Iron. I.] Ber. Deut. Chem. Gesell., vol. 61, B, 1928, pp. 1180-1195; Chem. Abs., vol. 22, 1928, p. 4289.

Continuation of the study of block C crystals. In previous work on thermal decompositions of hydrocarbons, temperatures under 700° could not be employed. With an Fe catalyst C separates from CO at 400°-700°, and from benzine at 700°-900°. The form or previous history of the Fe is without influence. The C samples so obtained were distinctly crystalline by X-ray analysis, the grain size increasing with temperature of deposition. Numerous density, chemical, and activity tests also depend on temperature. The fact that crystals of C can be obtained at so low a temperature indicates formations of a carbide with the Fe with subsequent decomposition. The formation of Fe₃C is not proved by X-ray analysis. However, at 400° with CO and at 700° with benzine diffraction lines appear for an unknown substance, which is called X-carbide, richer in C than Fe₃C.