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Showing papers on "Nickel boride published in 1980"


Journal ArticleDOI
TL;DR: In this paper, X-ray photoelectron spectroscopy has been employed to characterize the surface of nickel boride hydrogenation catalysts and the data indicate that the surface stoichiometry is identical to the bulk Ni 2 B.

182 citations


Journal ArticleDOI
TL;DR: In this paper, a poly(vinylpyrrolidone) was used as a polymer as a protective colloid to prevent atmospheric hydrogenation of olefins such as acrylamide.
Abstract: Colloidal nickel borides were prepared in ethanol from nickel(II) chloride and sodium borohydride using a polymer as a protective colloid. For atmospheric hydrogenation of olefins such as acrylamide at 30 °C, the colloid prepared by using poly(vinylpyrrolidone) exhibited catalytic activity 15–60 times that of the usual nickel boride prepared without using a polymer. The high activity of colloidal nickel borides was found to be due to the polymers, soluble nylon being the most effective. The colloids are stable under oxygen-free hydrogen, decomposing immediately on exposure to air.

16 citations


Journal ArticleDOI
TL;DR: Nickel boride generated within the wood structure allows the selective hydrogenolysis of wood meals as mentioned in this paper, and 4-n-Ethylguaiacol and 4n-ethylsyringol are prepared with interesting yields.

12 citations


Patent
19 Jun 1980
TL;DR: Nickel boride colloid useful as a catalyst for the hydrogenation of carbonyl compound is obtained by causing a nickel salt to react upon an alkali metal borohydride in an alcohol substantially free from dissolved oxygen under a non-oxidative atmosphere in the presence of an alcohol-soluble polymer.
Abstract: Nickel boride colloid useful as a catalyst for the hydrogenation of carbonyl compound is obtained by causing a nickel salt to react upon an alkali metal borohydride in an alcohol substantially free from dissolved oxygen under a non-oxidative atmosphere in the presence of an alcohol-soluble polymer.

9 citations


Patent
16 Dec 1980
TL;DR: In this paper, preferential hydrogenation of the methylene group of an organic compound is effected by bringing hydrogen into contact with the compound in the presence of a nickel boride colloid.
Abstract: In an organic compound having a methlene group attached to a tertiary carbon atom thereof, preferential hydrogenation of the methylene group of the compound is effected by bringing hydrogen into contact with the compound in the presence of a nickel boride colloid.

7 citations


Journal ArticleDOI
TL;DR: In this paper, the addition of sodium hydroxide to colloidal nickel boride in ethanol resulted in a marked enhancement of its catalytic activity for atmospheric hydrogenation of acetone at 30°C by a factor of more than 20.
Abstract: Addition of sodium hydroxide to colloidal nickel boride in ethanol resulted in a marked enhancement of its catalytic activity for atmospheric hydrogenation of acetone at 30°C by a factor of more than 20. Other ketones and aldehydes with bulky substituents were smoothly hydrogenated by the activated colloidal catalyst.

2 citations


Journal ArticleDOI
TL;DR: In this paper, a colloidal nickel borides in ethanol were prepared by the reaction of nickel(II) chloride with sodium borohydride in the presence of a polymer like poly(vinylpyrrolidone).
Abstract: Colloidal nickel borides in ethanol were prepared by the reaction of nickel(II) chloride with sodium borohydride in the presence of a polymer like poly(vinylpyrrolidone). The colloid was effective for the hydrogenation of acrylamide at 30°C under an atmospheric hydrogen pressure.