Journal ArticleDOI
Gas phase hydrogenation of acetonitrile on Raney nickel catalysts: reactive hydrogen
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TLDR
In this article, it was shown that only weakly adsorbed hydrogen, localised on top of the nickel atoms and on C 3 v symmetry sites, is active for hydrogenation.Abstract:
Catalytic hydrogenation of acetonitrile on Raney nickel has been studied in gas phase. The chemisorption of hydrogen has been followed by TPD and inelastic neutron scattering; these techniques indicate the presence of both weakly and strongly adsorbed hydrogen. Kinetic studies and pulse experiments show that only weakly adsorbed hydrogen, localised on top of the nickel atoms and on C 3 v symmetry sites, is active for the hydrogenation. Acetonitrile and reactive hydrogen are weakly adsorbed on Raney nickel, and compete for the same site. Conversely, amines more strongly adsorbed than acetonitrile, but on different sites, do not constitute a poison for the reaction.read more
Citations
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Journal ArticleDOI
The Reductive Amination of Aldehydes and Ketones and the Hydrogenation of Nitriles: Mechanistic Aspects and Selectivity Control
TL;DR: In this paper, a review of two of the most commonly used methods for the preparation of amines: reductive amination of aldehydes and ketones and the hydrogenation of nitriles is presented.
Journal ArticleDOI
On the mechanism of catalytic hydrogenation of nitriles to amines over supported metal catalysts
TL;DR: In this paper, it was shown that all reaction steps converting nitriles to primary, secondary and tertiary amines and unsaturated compounds take place on the catalysts surface.
Journal ArticleDOI
Stability of supported transition metal catalysts in the hydrogenation of nitriles
TL;DR: In this article, a gas phase hydrogenation of acetonitrile and butyronitrile over supported transition metal catalysts was carried out in a microflow reactor at 1 and 10 bar.
Journal ArticleDOI
Selective hydrogenation of acetonitrile to ethylamine using palladium-based alloy catalysts
TL;DR: In this article, a gas phase hydrogenation of acetonitrile has been studied with various Pd-based catalysts using several supports, including ZnO, Ga2O3, and In2O-3-supported catalysts.
Journal ArticleDOI
Investigations into the mechanism of the liquid-phase hydrogenation of nitriles over Raney-Co catalysts
TL;DR: In this article, the co-hydrogenation of acetonitrile and butyronitrile over Raney-Co was investigated in order to obtain insight into the mechanism underlying the formation of secondary amines.
References
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Journal ArticleDOI
Exchange reactions of hydrogen on metallic catalysts
Iurô Horiuti,M. Polanyi +1 more
Journal ArticleDOI
The nature of raney nickel, its adsorbed hydrogen and its catalytic activity for hydrogenation reactions (review)
TL;DR: In this article, the influence of catalyst preparation on the structure, texture and the metallic A1 content is reviewed and two examples of hydrogenation reactions with liquid acetone and gaseous benzene are described and the mechanisms are discussed in relation to the kinetics and the adsorbed hydrogen species.
Book ChapterDOI
Chapter 4 Hydrogenation of Nitriles
Jiří Volf,Josef Pasek +1 more
TL;DR: In this paper, the authors describe the hydrogenation of nitriles, which is a complicated process, owing to the existence of reactive intermediates comprising several consecutive and competitive reactions of different characters.