The Electrocatalytic Hydrogenation of Glucose: II . Raney Nickel Powder Flow‐Through Reactor Model

1994 ◽  
Vol 141 (10) ◽  
pp. 2742-2751 ◽  
Author(s):  
V. Anantharaman ◽  
P. N. Pintauro
Keyword(s):  
Raney Nickel ◽  
Nickel Powder ◽  
Powder Flow ◽  
Electrocatalytic Hydrogenation ◽  
Reactor Model ◽  
Flow Through

The electrocatalytic hydrogenation of fused poly cyclic aromatic compounds at Raney nickel electrodes: the influence of catalyst activation and electrolysis conditions

1990 ◽  
Vol 68 (7) ◽  
pp. 1218-1227 ◽  
Author(s):  
Denis Robin ◽  
Michel Comtois ◽  
Anna Martel ◽  
René Lemieux ◽  
Amoy Kam Cheong ◽  
...  
Keyword(s):  
Raney Nickel ◽  
Supporting Electrolyte ◽  
Aqueous Sodium Hydroxide ◽  
Constant Current ◽  
Electrocatalytic Hydrogenation ◽  
Catalyst Activation ◽  
Nickel Electrodes ◽  
Initial Ph ◽  
Raney Ni ◽  
Tetrabutylammonium Chloride

The electrocatalytic hydrogenation (ECH) of phenanthrene, anthracene, and naphthalene has been investigated under constant current at Raney nickel electrodes in a mixed aqueous organic medium. The influence of various parameters on the efficiency of the process determined by the current efficiency (a measure of the competition between hydrogenation and hydrogen evolution, the only two electrochemical processes occurring), the extent of hydrogenation (yield of octahydro-derivatives), and the conversion rate was studied with phenanthrene. The best conditions were ethylene glycol or propylene glycol as cosolvent containing between 1.5 to 5% of water, a neutral or slightly acidic medium containing boric acid (0.1 M) as buffer (initial pH of 2.6, final pH of 6.0–6.2), sodium chloride or tetrabutylammonium chloride as supporting electrolyte, a temperature of 80° C, and a current density of 42 to 84 mA/cm2. The most active electrodes (consisting of Raney Ni particles dispersed in a nickel matrix and surrounded by a layer of porous nickel) were obtained by leaching the dispersed alloy particles at 75 °C for 7 h in 30% aqueous sodium hydroxide. The electrohydrogenation stopped at derivatives with a single aromatic ring, namely the octahydrophenanthrenes, octahydroanthracenes, and tetralin. In a non-buffered medium, tetrahydrophenanthrene could be obtained with selectivities of 80% or better. Keywords: electrocatalytic hydrogenation, Raney nickel electrodes, phenanthrene, anthracene, naphthalene.

The electrocatalytic hydrogenation of phenanthrene at Raney nickel electrodes: the influence of an inert gas pressure

1998 ◽  
Vol 43 (12-13) ◽  
pp. 1697-1703 ◽  
Author(s):  
Richard Menini ◽  
Anna Martel ◽  
Hugues Me ́nard ◽  
Jean Lessard ◽  
Olivier Vittori
Keyword(s):  
Raney Nickel ◽  
Gas Pressure ◽  
Inert Gas ◽  
Electrocatalytic Hydrogenation ◽  
Nickel Electrodes

ChemInform Abstract: ASYMMETRIC SYNTHESIS BY MODIFIED RANEY NICKEL POWDER ELECTRODES

1983 ◽  
Vol 14 (4) ◽  
Author(s):  
M. FUJIHIRA ◽  
A. YOKOZAWA ◽  
H. KINOSHITA ◽  
T. OSA
Keyword(s):  
Asymmetric Synthesis ◽  
Raney Nickel ◽  
Nickel Powder

scholarly journals Asymmetric Reduction of Methyl Acetoacetate with Modified Raney-Nickel Powder Electrode

1985 ◽  
Vol 53 (2) ◽  
pp. 104-108 ◽  
Author(s):  
Tetsuo OSA ◽  
Tomokazu MATSUE ◽  
Akira YOKOZAWA ◽  
Tsukasa YAMADA ◽  
Masamichi FUJIHIRA
Keyword(s):  
Raney Nickel ◽  
Nickel Powder ◽  
Asymmetric Reduction ◽  
Methyl Acetoacetate

Powdered Metal Heat Treatment Apparatus Designed for a Laboratory

2020 ◽  
Author(s):  
Jacob Porter ◽  
John Parmigiani
Keyword(s):  
Heat Treatment ◽  
Additive Manufacturing ◽  
Material Properties ◽  
Powder Flow ◽  
Manufacturing Processes ◽  
Metal Production ◽  
Handling System ◽  
Powdered Metal ◽  
Flow Through ◽  
Metal Additive

Abstract Metal additive manufacturing is a rapidly growing and sophisticated industry however the manufacturing processes and equipment for the heat treatment of the needed powdered metals is underdeveloped. Heat treatment is a key step in the powdered metal production process and is often needed to produce desired material properties. The objective of this paper is to examine the design of a heat treatment machine that addresses the needs of a laboratory performing research on powdered metals. The device was designed to address the three criteria of a heat treatment device; treatment, environment, and containment. The treatment criterion is accomplished by continuous powder flow through a furnace. The environment criterion is accomplished through a gas handling system capable of creating both an argon and vacuum environment. Finally, the containment criterion is accomplished through a network of tubes that provides structure to contain the powder. The design of this machine will allow research and development labs to heat treat powdered to a higher quality at a significantly faster rate.

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