The Experts below are selected from a list of 62691 Experts worldwide ranked by ideXlab platform
Liangshih Fan - One of the best experts on this subject based on the ideXlab platform.
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syngas redox sgr process to Produce Hydrogen from coal derived syngas
Energy & Fuels, 2007Co-Authors: Puneet Gupta, Luis G Velazquezvargas, Liangshih FanAbstract:The syngas redox (SGR) process to Produce Hydrogen from coal derived syngas is described. The process involves reduction of a metal oxide to metallic form with syngas and subsequent regeneration wi...
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Syngas Redox (SGR) Process to Produce Hydrogen from Coal Derived Syngas
Energy & Fuels, 2007Co-Authors: Puneet Gupta, Luis G. Velazquez-vargas, Liangshih FanAbstract:The syngas redox (SGR) process to Produce Hydrogen from coal derived syngas is described. The process involves reduction of a metal oxide to metallic form with syngas and subsequent regeneration with steam to generate Hydrogen in a cyclic operation. Metal oxides of Ni, Cu, Cd, Co, Mn, Sn, and Fe were evaluated for this process based upon thermodynamic equilibrium limitations. It was found that Fe2O3 provided the best conversion of syngas to combustion products CO2 and H2O along with a high conversion of steam to Hydrogen. Other oxides provide high conversion of syngas but were found lacking in producing Hydrogen from steam. Composite particles with Fe2O3 as the key ingredient were developed that undergo multiple redox cycles without loss of activity. Analysis of process economics with respect to particle recyclability showed that the particles should undergo at least a 100 redox cycles without diminishing its activity. Process modifications to address carbon formation on reaction of syngas with iron oxide...
Puneet Gupta - One of the best experts on this subject based on the ideXlab platform.
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syngas redox sgr process to Produce Hydrogen from coal derived syngas
Energy & Fuels, 2007Co-Authors: Puneet Gupta, Luis G Velazquezvargas, Liangshih FanAbstract:The syngas redox (SGR) process to Produce Hydrogen from coal derived syngas is described. The process involves reduction of a metal oxide to metallic form with syngas and subsequent regeneration wi...
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Syngas Redox (SGR) Process to Produce Hydrogen from Coal Derived Syngas
Energy & Fuels, 2007Co-Authors: Puneet Gupta, Luis G. Velazquez-vargas, Liangshih FanAbstract:The syngas redox (SGR) process to Produce Hydrogen from coal derived syngas is described. The process involves reduction of a metal oxide to metallic form with syngas and subsequent regeneration with steam to generate Hydrogen in a cyclic operation. Metal oxides of Ni, Cu, Cd, Co, Mn, Sn, and Fe were evaluated for this process based upon thermodynamic equilibrium limitations. It was found that Fe2O3 provided the best conversion of syngas to combustion products CO2 and H2O along with a high conversion of steam to Hydrogen. Other oxides provide high conversion of syngas but were found lacking in producing Hydrogen from steam. Composite particles with Fe2O3 as the key ingredient were developed that undergo multiple redox cycles without loss of activity. Analysis of process economics with respect to particle recyclability showed that the particles should undergo at least a 100 redox cycles without diminishing its activity. Process modifications to address carbon formation on reaction of syngas with iron oxide...
Shunichi Fukuzumi - One of the best experts on this subject based on the ideXlab platform.
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much enhanced catalytic reactivity of cobalt chlorin derivatives on two electron reduction of dioxygen to Produce Hydrogen peroxide
Inorganic Chemistry, 2015Co-Authors: Kentaro Mase, Kei Ohkubo, Shunichi FukuzumiAbstract:Effects of changes in the redox potential or configuration of cobalt chlorin derivatives (CoII(Chn) (n = 1–3)) on the catalytic mechanism and the activity of two-electron reduction of dioxygen (O2) were investigated based on the detailed kinetic study by spectroscopic and electrochemical measurements. Nonsubstituted cobalt chlorin complex (CoII(Ch1)) efficiently and selectively catalyzed two-electron reduction of dioxygen (O2) by a one-electron reductant (1,1′-dimethylferrocene) to Produce Hydrogen peroxide (H2O2) in the presence of perchloric acid (HClO4) in benzonitrile (PhCN) at 298 K. The detailed kinetic studies have revealed that the rate-determining step in the catalytic cycle is the proton-coupled electron transfer reduction of O2 with the protonated CoII(Ch1) complex ([CoII(Ch1H)]+), where one-electron reduction potential of [CoIII(Ch1)]+ was changed from 0.37 V (vs SCE) to 0.48 V by the addition of HClO4 due to the protonation of [CoIII(Ch1)]+. The introduction of electron-withdrawing aldehyde g...
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Hydrogen peroxide as a sustainable energy carrier electrocatalytic production of Hydrogen peroxide and the fuel cell
Electrochimica Acta, 2012Co-Authors: Shunichi Fukuzumi, Yusuke Yamada, Kenneth D KarlinAbstract:This review describes homogeneous and heterogeneous catalytic reduction of dioxygen with metal complexes focusing on the catalytic two-electron reduction of dioxygen to Produce Hydrogen peroxide. Whether two-electron reduction of dioxygen to Produce Hydrogen peroxide or four-electron O2-reduction to Produce water occurs depends on the types of metals and ligands that are utilized. Those factors controlling the two processes are discussed in terms of metal–oxygen intermediates involved in the catalysis. Metal complexes acting as catalysts for selective two-electron reduction of oxygen can be utilized as metal complex-modified electrodes in the electrocatalytic reduction to Produce Hydrogen peroxide. Hydrogen peroxide thus Produced can be used as a fuel in a Hydrogen peroxide fuel cell. A Hydrogen peroxide fuel cell can be operated with a one-compartment structure without a membrane, which is certainly more promising for the development of low-cost fuel cells as compared with two compartment Hydrogen fuel cells that require membranes. Hydrogen peroxide is regarded as an environmentally benign energy carrier because it can be Produced by the electrocatalytic two-electron reduction of O2, which is abundant in air, using solar cells; the Hydrogen peroxide thus Produced could then be readily stored and then used as needed to generate electricity through the use of Hydrogen peroxide fuel cells.
Kenneth D Karlin - One of the best experts on this subject based on the ideXlab platform.
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Hydrogen peroxide as a sustainable energy carrier electrocatalytic production of Hydrogen peroxide and the fuel cell
Electrochimica Acta, 2012Co-Authors: Shunichi Fukuzumi, Yusuke Yamada, Kenneth D KarlinAbstract:This review describes homogeneous and heterogeneous catalytic reduction of dioxygen with metal complexes focusing on the catalytic two-electron reduction of dioxygen to Produce Hydrogen peroxide. Whether two-electron reduction of dioxygen to Produce Hydrogen peroxide or four-electron O2-reduction to Produce water occurs depends on the types of metals and ligands that are utilized. Those factors controlling the two processes are discussed in terms of metal–oxygen intermediates involved in the catalysis. Metal complexes acting as catalysts for selective two-electron reduction of oxygen can be utilized as metal complex-modified electrodes in the electrocatalytic reduction to Produce Hydrogen peroxide. Hydrogen peroxide thus Produced can be used as a fuel in a Hydrogen peroxide fuel cell. A Hydrogen peroxide fuel cell can be operated with a one-compartment structure without a membrane, which is certainly more promising for the development of low-cost fuel cells as compared with two compartment Hydrogen fuel cells that require membranes. Hydrogen peroxide is regarded as an environmentally benign energy carrier because it can be Produced by the electrocatalytic two-electron reduction of O2, which is abundant in air, using solar cells; the Hydrogen peroxide thus Produced could then be readily stored and then used as needed to generate electricity through the use of Hydrogen peroxide fuel cells.
Luis G Velazquezvargas - One of the best experts on this subject based on the ideXlab platform.
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syngas redox sgr process to Produce Hydrogen from coal derived syngas
Energy & Fuels, 2007Co-Authors: Puneet Gupta, Luis G Velazquezvargas, Liangshih FanAbstract:The syngas redox (SGR) process to Produce Hydrogen from coal derived syngas is described. The process involves reduction of a metal oxide to metallic form with syngas and subsequent regeneration wi...
