The Role of Hydrogen in Raney Nickel Catalysts

1959 ◽  
Vol 81 (19) ◽  
pp. 5032-5037 ◽  
Author(s):  
R. J. Kokes ◽  
P. H. Emmett
Keyword(s):  
Raney Nickel ◽  
Nickel Catalysts

Synthetical Applications of Activated Metal Catalysts. XVI. The Role of Hydrogen in the Formation of 2,2'-Bipyridyl from Pyridine under the Influence of Degassed Raney Nickel

1963 ◽  
Vol 16 (1) ◽  
pp. 14 ◽  
Author(s):  
WHF Sasse ◽  
CP Whittle
Keyword(s):  
Raney Nickel ◽  
Nickel Catalysts ◽  
Nickel Atom ◽  
Metal Catalysts ◽  
Published Data ◽  
Hydrogen Atoms ◽  
Adsorbed Pyridine

The efficiency of W7 Raney nickel catalysts degassed between 30 and 400�C in the preparation of 2,2'-bipyridyl has been examined. The highest activities are observed with catalysts which have been degassed at 200�C, and these catalysts arc up to 20% more efficient than catalysts previously used and degassed at 100�C. The results obtained are compared with published data concerning the hydrogen contents of degassed Raney nickel catalysts (Kokes and Emmett 1959, 1960). This shows that catalysts which are virtually free of hydrogen are only 25% less efficient than catalysts degassed at l00�C (containing 65 to 70% of their original hydrogen). Because of this finding a new mechanism is proposed in which the adsorbed pyridine is activated by the transfer of an electron from the catalyst. On stereochemical grounds it is proposed that meso-2,2'-dihydro-2,2'-bipyridyl with axially disposed hydrogen atoms at the 2,2'-positions and bonded via both nitrogen atoms to one nickel atom is the energetically most favoured intermediate.

Role of solid-state structure in propene hydrogenation with nickel catalysts

1990 ◽  
Vol 86 (4) ◽  
pp. 739 ◽  
Author(s):  
Giovanni Carturan ◽  
Stefano Enzo ◽  
Renzo Ganzerla ◽  
Maurizio Lenarda ◽  
Roberto Zanoni
Keyword(s):  
Solid State ◽  
Nickel Catalysts ◽  
State Structure ◽  
Solid State Structure

The Preparation and Aging of Raney Nickel Catalysts

1949 ◽  
Vol 71 (11) ◽  
pp. 3769-3771 ◽  
Author(s):  
Hilton A. Smith ◽  
William C. Bedoit ◽  
John F. Fuzek
Keyword(s):  
Raney Nickel ◽  
Nickel Catalysts

ChemInform Abstract: The Quantitative Recycling of Raney—Nickel Catalysts on a Lab-Scale.

ChemInform ◽  
2008 ◽  
Vol 39 (11) ◽  
Author(s):  
Waldemar M. Czaplik ◽  
Joerg-M. Neudoerfl ◽  
Axel Jacobi von Wangelin
Keyword(s):  
Raney Nickel ◽  
Nickel Catalysts

scholarly journals Efficient alkene hydrosilation with bis(8-quinolyl)phosphine (NPN) nickel catalysts. The dominant role of silyl-over hydrido-nickel catalytic intermediates

2020 ◽  
Vol 11 (19) ◽  
pp. 5043-5051
Author(s):  
Jian Yang ◽  
Verònica Postils ◽  
Michael I. Lipschutz ◽  
Meg Fasulo ◽  
Christophe Raynaud ◽  
...  
Keyword(s):  
Nickel Complex ◽  
Dominant Role ◽  
Nickel Catalysts ◽  
Mild Conditions ◽  
Catalytic Intermediates

A cationic nickel complex of the bis(8-quinolyl)(3,5-di-tert-butylphenoxy)phosphine (NPN) ligand, [(NPN)NiCl]+, is a precursor to efficient catalysts for the hydrosilation of alkenes with hydrosilanes under mild conditions and low catalyst loadings.

Stereoselective reduction with raney nickel catalysts

1973 ◽  
Vol 14 (20) ◽  
pp. 1773-1775 ◽  
Author(s):  
J.H.P. Tyman ◽  
S.W. Wilkins
Keyword(s):  
Raney Nickel ◽  
Nickel Catalysts ◽  
Stereoselective Reduction
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