銅・クロム・マンガン酸化物触媒の性能に関する研究-8-

概要

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We have succeeded in hydrogenation of nitrobenzene to aniline in quantitative yield in the vapor phase on the same hydrogenation condition mentioned in the previous report (27) by using pilled copperchromium-manganese oxide catalyst, prepared by the new method. The preparation of the catalyst (KW-11) is as follows; the copper-chromium-manganese oxide powder (KW-1) is mixed with the water solution of chromic acid anhydride. In this procedure copper oxide contained in KW-1 reacts with cromic acid to produce a compound of copper-chromium oxide (CuCr2O7·2H2O), and this may act as a binder of the copper-chromium-manganese oxide powder. Then these mixture are pilled 3mm×3mm size by ordinary pilling machine. In this experiment the amount of chromic acid is regulated to be the same mols of CuO contained in KW-1. The crushing strength of KW-11 is 100kg/cm2, and the KW-11 used in the hydrogenation is 250kg/cm2. From X-ray diffraction data, the type of combination of metallic oxide present in the used catalyst is as follows; the catalyst consists of reduced copper, CuCr2O4 combined with manganese oxide and may be amorphous CuCr2O4 which is reduced from CuCr2O7·2H2O.
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