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Nickel boride is the common name of materials composed chiefly of the elements nickel and boron that are widely used as catalysts in organic chemistry. [ 1 ] [ 2 ] Their approximate chemical composition is Ni 2.5 B, [ 3 ] and they are often incorrectly denoted " Ni
Dinickel boride can be obtained (together with other nickel borides) by heating sodium borohydride with powdered nickel metal up to 670 °C in a closed vessel, so that the released hydrogen creates a pressure of up to 3.4 MPa. The main reactions can be summarized as 2 NaBH 4 ↔ 2NaH + B 2 H 6 2Ni + 2 B 2 H 6 + NaH ↔ Ni 2 B + 3 BH 3 + 2 H 2 + Na
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Metallic nickel is precipitated by treating a solution of a nickel salt with an excess of zinc. [3] [1] 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 are different designations for differently prepared Urushibara nickel catalysts. [4]
Catalysts for the reaction often include group 10 metals such as Raney nickel, [4] [5] [6] palladium black, or platinum dioxide. [1] However, other catalysts, such as cobalt boride, also can be regioselective for primary amine production: R-C≡N + 2 H 2 → R-CH 2 NH 2
Trinickel boride can be obtained, as grains embedded in a nickel matrix, by heating Brown's P-1 and P-2 "nickel boride"catalyst to 250 °C. This catalyst is produced by reduction of nickel salts with sodium borohydride. [5] Trinickel boride can be obtained also by compressing nickel and boron powders with explosives. [6]