Urushibara nickel

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Urushibara nickel is a hydrogenation catalyst, made from nickel. It is useful for various hydrogenations.


It was discovered by Yoshiyuki Urushibara in 1951, while doing research on the reduction of estrone to estradiol.


First nickel is precipitated in metallic form by reacting a solution of a nickel salt with zinc. This precipitated nickel contains relatively large amounts of zinc and zinc oxide. Then the catalyst is activated by digesting with either base or acid. There is different designations for differently prepared Urushibara nickel catalysts. The most common is U-Ni-A and U-Ni-B. U-Ni-A is prepared by digesting the precipitated nickel with an acid such as acetic acid. U-Ni-B is prepared by digesting with a base such as sodium hydroxide. After the digestion with acid most of the zinc and zinc oxide is dissolved from the catalyst, while after digestion with base it still contains considerable amounts of zinc and zinc oxide. It is also possible to precipitate the nickel using aluminium or magnesium.


Urushibara nickel is not pyrophoric. It can be used for most hydrogenations where Raney nickel can be used.


Hata, Kazuo (1971). New Hydrogenating Catalysts: Urushibara Catalysts. Halsted Press Division. ISBN 0 470-35890-4.