High Pressure Reduction of Organic Compounds with Urushibara Catalyst. VI. A New Type of Urushibara Nickel Catalyst

A new Urushibara nickel catalyst, U-Ni-BA, was prepared from nickel chloride and aluminum grains. This new catalyst was found to be highly active for the hydrogenation of aromatic nucleus, contrary to the older Urushibara nickel catalyst, U-Ni-A or U-Ni-B. The preservability of the catalyst was examined: the precipitate, obtained by the reaction of nickel chloride with aluminum grains (or zinc dust), was kept for a long time in solvent or in dry state, and a similarly active catalyst could be obtained by digesting the preserved precipitate with aqueous caustic alkali.