1754a. KIMUMAKI, J., SHIRAI, S., AND OGAWA, T. Iron Catalyst for the Benzene Synthesis. Jour. Soc. Chem. Ind. (Japan), vol. 46, 1943, suppl. bind. pp. 80-83; Chem. Abs., vol. 46, 1952, p. 1,186.

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Literature Abstracts

For the preparation of better Fe catalysts for the synthesis of benzene from gas mixtures of CO and H₂, it is important to consider the state of division of the alkali to be added, the effect of the duration, and of the degree of heating. In order to improve the state of division of the alkali, it is recommended to replace the alkali carbonates, which were used in most cases with alkali nitrate which is easily formed at the precipitation of the metal hydroxides by K₂CO₃. The alkali nitrate was left in suitable quantity in the precipitate by properly regulating its washing. This alkali nitrate is always converted at the reduction process into alkali carbonate, which causes a homogeneous distribution of the alkali on the surface of the diatomaceous earth. Superheating the catalyst often impairs the synthesis of benzene. The reduction with H₂ will, therefore, be avoided as much as possible, because higher temperatures are always needed for this purpose. It is concluded, that for the synthesis of benzene from natural gases, the selective adsorption of the alkali among the catalyst metals and the diatomaceous earth is of great importance.

KIMURA, K. See abs. 1927, 1928, 1929.