Electrochemical reduction of some o-bis(phenylsulphonyl)benzene derivatives. Effect of the substrate structure and of the addition of bases on the product distribution

1987 ◽  
pp. 623 ◽  
Author(s):  
Marino Novi ◽  
Giacomo Garbarino ◽  
Giovanni Petrillo ◽  
Carlo Dell'Erba
Keyword(s):  
Electrochemical Reduction ◽  
Product Distribution ◽  
Benzene Derivatives ◽  
Substrate Structure

Electrochemical reduction of aromatic ketones in 1-butyl-3-methylimidazolium-based ionic liquids in the presence of carbon dioxide: the influence of the ketone substituent and the ionic liquid anion on bulk electrolysis product distribution

2015 ◽  
Vol 17 (29) ◽  
pp. 19247-19254 ◽  
Author(s):  
Shu-Feng Zhao ◽  
Mike Horne ◽  
Alan M. Bond ◽  
Jie Zhang
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Electrochemical Reduction ◽  
Product Distribution ◽  
Aromatic Ketone ◽  
Aromatic Ketones ◽  
Bulk Electrolysis ◽  
Electrolysis Product

The yield of electrocarboxylation of aromatic ketone depends on the imidazolium-based ionic liquid anion and the ketone substituent.

Electrochemical Reduction of CO2 using Copper Oxide Nanoparticles supported on Glassy Carbon Electrodes

2014 ◽  
Vol 1677 ◽  
Author(s):  
Gregory L. Griffin ◽  
Joel Bugayong
Keyword(s):  
Electrochemical Reduction ◽  
Glassy Carbon ◽  
Morphological Changes ◽  
Chemical Reduction ◽  
Product Distribution ◽  
Product Formation ◽  
Copper Oxide Nanoparticles ◽  
Carbon Fiber Paper ◽  
Cu Foil ◽  
Reduction Of Co2

ABSTRACTWe have studied the electrochemical reduction of CO2 using Cu2O nanoparticles deposited on planar electrodes. Nanoparticles are prepared in aqueous solution by chemical reduction of CuCl2 using ascorbic acid with polyethylene glycol surfactant. The particles are then re-suspended in ethanol with added Nafion binder and brush-coated onto glassy carbon substrates. The CO2 electroreduction activity is measured in KHCO3 electrolyte under flowing CO2 using a two-compartment electrochemical cell. Product formation rates are determined using gas chromatography; major gas phase products include CO, H2, C2H4, and CH4, while liquid phase products include C2H5OH and 1-C3H5OH. The observed product distribution agrees with results obtained previously using similar Cu2O particles deposited on carbon fiber paper supports, as well as Cu2O catalysts prepared by electrodeposition or thermal oxidation. In particular, the catalysts produce a much higher ratio of C2H4 to CH4 than observed using polycrystalline Cu foil. The potential dependence of the formation rates for hydrocarbon and alcohol products is roughly two times greater than for H2 and CO formation. Both XRD and SEM measurements confirm the Cu2O nanoparticles undergo at least partial reduction to Cu metal under CO2 reduction conditions, accompanied by significant surface morphological changes. Thus the kinetic results are consistent with current models that the increased C2H4/CH4 ratio is due to the presence of a more open atomic structure on the freshly reduced Cu surfaces.

The electrochemical reduction of α-nitrocumene in a protic and basic medium on large surface area (porous) electrodes: electronation-protonation or electrocatalytic hydrogenation?

1999 ◽  
Vol 77 (5-6) ◽  
pp. 687-694 ◽  
Author(s):  
Elisa Soazara Chan-Shing ◽  
Denys Boucher ◽  
Jean Lessard
Keyword(s):  
Electrochemical Reduction ◽  
Surface Area ◽  
Product Distribution ◽  
Porous Electrodes ◽  
Large Surface Area ◽  
Basic Medium ◽  
Electrocatalytic Hydrogenation ◽  
Polycrystalline Nickel ◽  
Metal Electrodes ◽  
Controlled Potential

The electrochemical reduction of α-nitrocumene (1) has been investigated under controlled potential, at a mercury pool cathode and at Raney metal (Raney nickel, Raney cobalt and Devarda copper) and fractal nickel electrodes in basic aqueous ethanol. A comparison of the product distribution from the reduction at Hg (electronation-protonation (EP) mechanism) and that from the reduction at Raney metals and fractal nickel has shown that both the electrocatalytic hydrogenation (ECH) and EP mechanisms can be involved at large surface area (porous) transition metal electrodes in a basic protic medium. Cyclic voltammetry was used to determine the reduction potential of 1 at Hg and at bright polycrystalline nickel, cobalt, and copper cathodes in the same medium.Key words: electrocatalytic hydrogenation, electroreduction, 2-nitro-2-phenylpropane, Raney metal cathodes, mechanism.

scholarly journals Electrochemical Reduction of Carbon Dioxide at Gold-Palladium Core-Shell Nanoparticles: Product Distribution versus Shell Thickness

ChemCatChem ◽  
2016 ◽  
Vol 8 (5) ◽  
pp. 952-960 ◽  
Author(s):  
Jo J. L. Humphrey ◽  
Daniela Plana ◽  
Verónica Celorrio ◽  
Sajanikumari Sadasivan ◽  
Robert P. Tooze ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Electrochemical Reduction ◽  
Shell Thickness ◽  
Product Distribution ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Distribution Versus ◽  
Core Shell Nanoparticles

Electrochemical Reduction of CO2 using Supported Cu2O Catalysts

2013 ◽  
Vol 1542 ◽  
Author(s):  
Joel Bugayong ◽  
Gregory L. Griffin
Keyword(s):  
Electrochemical Reduction ◽  
Computational Models ◽  
Chemical Reduction ◽  
Product Distribution ◽  
Ethanol Solution ◽  
Branch Points ◽  
Faradaic Efficiency ◽  
The Individual ◽  
Reduction Of Co2 ◽  
Major Hydrocarbon

ABSTRACTWe have studied the electrochemical reduction of CO2 to produce short chain hydrocarbons and alcohols using supported Cu2O electrocatalysts. The catalysts are prepared using Cu2O nanoparticles formed by chemical reduction of aqueous CuCl2 mixed with polyethylene glycol surfactant, followed by addition of NaOH and L-ascorbic acid (sodium). The nanoparticles are then added to a Nafion/ethanol solution and coated onto a carbon fiber support. When tested used for CO2 electroreduction at −1.5 V(NHE), the Cu2O particles are reduced to metallic Cu, but the hydrocarbon product distribution remains different from that reported for conventional metallic Cu electrodes. Ethylene is the major hydrocarbon produced, with a Faradaic efficiency around 25%, while the efficiency for CH4 formation is reduced to around 1%. The major alcohol product is ethanol, with a Faradaic efficiency around 6%. The relative formation rates of the individual products are discussed in terms of the relevant branch points in recent computational models for the overall reaction mechanism.

Coefficients of molecular homeomorphism and crystalline isomorphism in the series of para-disubstituted benzene derivatives

1991 ◽  
Vol 88 ◽  
pp. 509-514 ◽  
Author(s):  
MA Cuevas Diarte ◽  
T Calvet ◽  
M Labrador ◽  
E Estop ◽  
HAJ Oonk ◽  
...  
Keyword(s):  
Benzene Derivatives ◽  
Disubstituted Benzene
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