The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform

Xian-yong Wei - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical Reduction of pyrite in aqueous NaCl solution
    Fuel, 2004
    Co-Authors: Wei Zhao, Hong Zhu, Zhi-min Zong, Jian-hua Xia, Xian-yong Wei
    Abstract:

    Abstract Optimum conditions for pyrite removal from a high-sulfur coal by Electrochemical Reduction during flotation are determined by orthogonal experiments. The Electrochemical Reduction process of pure pyrite is examined with XRD, Electrochemical and chemical analysis. The results show that the Electrochemical Reduction products of pyrite are FeS and S2−. During this process, the reactions at cathode are: FeS2+2e→FeS+S2− and 2H++2e→H2. The corresponding electrode potentials and kinetic equation are determined. The conversion of hydrophobic pyrite to hydrophilic FeS and S2− by Electrochemical Reduction is beneficial to desulfurization from coal in floatation process.

Jean-paul Glatz - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical Reduction of (U, Pu)O2 in Molten LiCl and CaCl2 Electrolytes
    Journal of Nuclear Science and Technology, 2007
    Co-Authors: Masatoshi Iizuka, Tadashi Inoue, Michel Ougier, Jean-paul Glatz
    Abstract:

    The Electrochemical Reduction of UO2-PuO2 mixed oxides (MOX) was performed in molten LiCl at 923 K and CaCl2 at 1,123 K to evaluate the behavior of the plutonium quantitatively and to define the optimum conditions for the Electrochemical Reduction of those materials. In LiCl, excess deposition of lithium metal can be avoided and the MOX was smoothly reduced at −0.65 V vs. Bi-35 mol% Li reference electrode. The Reduction ratio calculated from the mass change of the samples taken during the Electrochemical Reduction and the ratio evaluated by gas-burette method were in good agreement. The cathodic current efficiency remained 30–50% mainly due to the deoxidation of tantalum cathode basket. Although dissolution of plutonium and americium into the electrolyte was found by the chemical analysis, the dissolved amount was negligible and had no immediate influence on the feasibility of the Electrochemical Reduction process. In CaCl2, Reduction of the MOX occurred in whole range of the tested cathode potential (−0....

Kiyohisa Ohta - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical Reduction of CO2 in methanol with aid of CuO and Cu2O
    Catalysis Today, 2009
    Co-Authors: Shinya Ohya, Hideyuki Katsumata, Satoshi Kaneco, Tohru Suzuki, Kiyohisa Ohta
    Abstract:

    Abstract The Electrochemical Reduction of CO 2 in methanol-based electrolyte was investigated with zinc particle-pressed electrodes. In order to evaluate the characteristic of copper oxide catalysts for the Electrochemical Reduction of CO 2 , zinc particles mixed with CuO and Cu 2 O powders were pressed for fabricating a disk plate of electrode. Without copper oxide particles, only formic acid and carbon monoxide were formed in the Electrochemical Reduction of CO 2 , and the formation of hydrocarbons could scarcely be observed. On the other hand, hydrocarbons were obtained for the zinc particle-pressed electrodes containing copper oxide particles. At CuO/Zn particle-pressed electrode, the Faradic efficiency of ethylene was better relative to that of methane at all conditions tested. With Cu 2 O/Zn powder-pressed electrode, the current efficiency of methane was larger compared with that of ethylene in the low content range of Cu 2 O (1–2.5%). The maximum formation efficiencies of methane and ethylene were of 7.5% and 6.8% with the electrode consisted of Cu 2 O/Zn, respectively. It was found that copper oxide catalysts (CuO and Cu 2 O) were effective for the formation of hydrocarbons, especially ethylene, in the Electrochemical Reduction of CO 2 in methanol-based electrolyte.

  • Electrochemical Reduction of CO2 in copper particle-suspended methanol
    Chemical Engineering Journal, 2006
    Co-Authors: Satoshi Kaneco, Yousuke Ueno, Hideyuki Katsumata, Tohru Suzuki, Kiyohisa Ohta
    Abstract:

    Abstract The Electrochemical Reduction of CO 2 in copper particle-suspended methanol was investigated with lead and zinc electrodes. Without copper particles, only formic acid and carbon monoxide were formed in the Electrochemical Reduction of CO 2 , and the formation of hydrocarbons could not be observed. On the contrary, hydrocarbons were obtained in the copper particle-suspended electrolyte. The Faradaic efficiencies for methane and ethylene increased gradually with increasing the amounts of copper particles, however the current efficiencies of formic acid and CO decreased. The maximum formation efficiencies of methane were of 6% and 12%, at Pb and Zn electrodes, respectively. It was found to be able to roughly change and control the Reduction product distributions by the addition of metal particles into the catholyte in the Electrochemical Reduction of CO 2 .

  • Electrochemical Reduction of CO2 on Cu in 0.1 M KOH-methanol
    Energy Sources, 1997
    Co-Authors: Takayuki Mizuno, Kiyohisa Ohta, Mituhiro Kawamoto, Akira Saji
    Abstract:

    The Electrochemical Reduction of carbon dioxide in 0.1 M KOH-methanol electrolyte was investigated with a copper electrode at −30, −15, 0, and 15°C. The main products from carbon dioxide by Electrochemical Reduction were carbon monoxide, formic acid, ethylene, and methane. Under the optimum experimental conditions, 56% Faradaic efficiency carbon monoxide, 23% formic acid, and 10% methane were produced from carbon dioxide by Electrochemical Reduction. The best ethylene formation (12%) was obtained at −2.2 V and 0°C.

  • Electrochemical Reduction of CO2 in methanol at −30°C
    Journal of Electroanalytical Chemistry, 1995
    Co-Authors: Takayuki Mizuno, Akira Naitoh, Kiyohisa Ohta
    Abstract:

    Abstract The Electrochemical Reduction of carbon dioxide at an extremely low temperature (−30°C) was investigated with a copper electrode in methanol electrolyte. Products of the Electrochemical Reduction of carbon dioxide were methane, carbon monoxide and ethylene. Under optimal experimental conditions, the faradaic efficiency of methane was more than 42%. At the low temperature, the efficiency of hydrogen formation as the competitive reaction was depressed to less than 8%.

C. Suresh Reddy - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical Reduction Behaviour of Guanethidine
    Asian Journal of Research in Chemistry, 2011
    Co-Authors: P. Chenna Rohini Kumar, C. Sridevi, G.r.k. Naidu, C. Suresh Reddy
    Abstract:

    The Electrochemical Reduction behaviour of 2-[2-(azocan-1-yl) ethyl] guanidine (Guanethidine) has been studied in different supporting electrolytes (HClO4, HCl,H2SO4) in DMF water mixtures by employing D.C polarography, controlled potential electrolysis and millicoulometry. The kinetic parameters such as diffusion coefficient(D) and heterogeneous forward rate constant (kof, h) values were evaluated and reported. A Reduction mechanism is proposed in consistency with the data obtained.

  • Electrochemical Reduction behaviour of chlomethoxyfen
    Organic Chemistry: An Indian Journal, 2011
    Co-Authors: K. Balaji, C. Sridevi, C. Suresh Reddy
    Abstract:

    The Electrochemical Reduction behaviour of chlomethoxyfen has been studied using d.c. polarography, cyclic voltammetry, millicoulometry and controlled potential electrolysis in universal buffers of pH values ranging from 2.0 to 12.0 in double distilled-water. Kinetic parameters such as diffusion coefficient (D) and heterogeneous forward rate constant (Ki‚°f.h) values are evaluated and reported.AReduction mechanism is proposed in consistence with the data obtained.

Myung Soo Kim - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical Reduction of organic sulfides investigated by Raman spectroscopy
    The Journal of Physical Chemistry, 1992
    Co-Authors: Sang Bok Lee, Kwan Kim, Myung Soo Kim
    Abstract:

    The Electrochemical Reduction of aromatic and aliphatic sulfides has been investigated at Ag electrodes by means of surface-enhanced Raman spectroscopy (SERS) and cyclic voltammetry. The SERS technique applied to a rotating electrode system was demonstrated to be very useful for microscopic study of the Electrochemical process on metal surfaces. We have proven the validity of the earlier proposition that addition of borohydride in aqueous Ag sol lowers the sol surface potential, enabling the Electrochemical Reduction of organic sulfides to thiolates