The Experts below are selected from a list of 19938 Experts worldwide ranked by ideXlab platform

Ferenc Darvas - One of the best experts on this subject based on the ideXlab platform.

  • a benchtop continuous flow reactor a solution to the hazards posed by gas cylinder based hydrogenation
    Journal of Chemical Health and Safety, 2013
    Co-Authors: Gyorgy Dorman, Laszlo Kocsis, Richard A L Jones, Ferenc Darvas
    Abstract:

    This paper reports on benchtop continuous-flow hydrogenation reactors (H-Cube 1 together with its new version, a follow-up model H-Cube Pro 2 ) and its safe application in chemical laboratories. The reactors combine endogenous hydrogen generation from the Electrolysis of Water with a continuous flow-through system. The system makes significant advances over current batch hydrogenation reactors in terms of safety, rates of reaction, as well as reaction optimization efficiency. The hydrogenation process is described along with a general introduction and capabilities of the device. Several hydrogenation reactions will be discussed that are normally avoided in the comtemporary laboratories, either solely for safety reasons (applying highly pyrophoric catalysts or explosive reactants) or because standard batch equipment has difficulties achieving high temperature and pressures. The solution to these problems may open many novel chemistry opportunities and pathways for chemists to develop new compounds.

  • continuous flow high pressure hydrogenation reactor for optimization and high throughput synthesis
    ACS Combinatorial Science, 2006
    Co-Authors: Richard V Jones, Lajos Godorhazy, Varga Norbert, Daniel Szalay, Laszlo Urge, Ferenc Darvas
    Abstract:

    This paper reports on a novel continuous-flow hydrogenation reactor and its integration with a liquid handler to generate a fully automated high-throughput hydrogenation system for library synthesis. The reactor, named the H-Cube, combines endogenous hydrogen generation from the Electrolysis of Water with a continuous flow-through system. The system makes significant advances over current batch hydrogenation reactors in terms of safety, reaction validation efficiency, and rates of reaction. The hydrogenation process is described along with a detailed description of the device's main parts. The reduction of a series of functional groups, varying in difficulty up to 70 degrees C and 70 bar are also described. The paper concludes with the integration of the device into an automated liquid handler followed by the reduction of a nitro compound in a high throughput manner. The system is fully automated and can conduct 5 reactions in the time it takes to perform and workup one reaction manually on a standard batch reactor.

  • continuous flow high pressure hydrogenation reactor for optimization and high throughput synthesis
    ACS Combinatorial Science, 2006
    Co-Authors: Richard V Jones, Lajos Godorhazy, Daniel Szalay, Laszlo Urge, Norbert Varga, Ferenc Darvas
    Abstract:

    This paper reports on a novel continuous-flow hydrogenation reactor and its integration with a liquid handler to generate a fully automated high-throughput hydrogenation system for library synthesis. The reactor, named the H-Cube, combines endogenous hydrogen generation from the Electrolysis of Water with a continuous flow-through system. The system makes significant advances over current batch hydrogenation reactors in terms of safety, reaction validation efficiency, and rates of reaction. The hydrogenation process is described along with a detailed description of the device's main parts. The reduction of a series of functional groups, varying in difficulty up to 70 °C and 70 bar are also described. The paper concludes with the integration of the device into an automated liquid handler followed by the reduction of a nitro compound in a high throughput manner. The system is fully automated and can conduct 5 reactions in the time it takes to perform and workup one reaction manually on a standard batch reactor.

Leroy Cronin - One of the best experts on this subject based on the ideXlab platform.

  • 3d printed flow plates for the Electrolysis of Water an economic and adaptable approach to device manufacture
    Energy and Environmental Science, 2014
    Co-Authors: Greig Chisholm, Philip J Kitson, Niall Kirkaldy, Leanne G Bloor, Leroy Cronin
    Abstract:

    The Electrolysis of Water is considered a promising route to the production of hydrogen from renewable energy sources. Electrolysers based on proton exchange membranes (PEMs) have a number of advantages including high current density, high product gas purity and the ability to operate at high pressure. Despite these advantages the high cost of such devices is an impediment to their widespread deployment. A principal factor in this cost are the materials and machining of flow plates for distribution of the liquid reagents and gaseous products in the electrochemical cell. We demonstrate the production and operation of a PEM electrolyser constructed from silver coated 3D printed components fabricated from polypropylene. This approach allows construction of light weight, low cost electrolysers and the rapid prototyping of flow field design. Furthermore we provide data on the operation of this electrolyser wherein we show that performance is excellent for a first generation device in terms of overall efficiency, internal resistances and current–voltage response. This development opens the door to the fabrication of light weight and cheap electrolysers as well as related electrochemical devices such as flow batteries and fuel cells.

  • Decoupled catalytic hydrogen evolution from a molecular metal oxide redox mediator in Water splitting
    Science, 2014
    Co-Authors: Benjamin Rausch, Mark D. Symes, Greig Chisholm, Leroy Cronin
    Abstract:

    The Electrolysis of Water using renewable energy inputs is being actively pursued as a route to sustainable hydrogen production. Here we introduce a recyclable redox mediator (silicotungstic acid) that enables the coupling of low-pressure production of oxygen via Water oxidation to a separate, catalytic hydrogen production step outside the electrolyzer that requires no post-Electrolysis energy input. This approach sidesteps the production of high-pressure gases inside the electrolytic cell (a major cause of membrane degradation) and essentially eliminates the hazardous issue of product gas crossover at the low current densities that characterize renewables-driven Water-splitting devices. We demonstrated that a platinum-catalyzed system can produce pure hydrogen over 30 times faster than state-of-the-art proton exchange membrane electrolyzers at equivalent platinum loading.

  • a bio inspired small molecule electron coupled proton buffer for decoupling the half reactions of electrolytic Water splitting
    Journal of the American Chemical Society, 2013
    Co-Authors: Benjamin Rausch, Mark D. Symes, Leroy Cronin
    Abstract:

    Electron-coupled-proton buffers (ECPBs) allow H2 and O2 evolution to be separated from each other in time during the Electrolysis of Water. Natural photosynthetic systems achieve an analogous feat during Water splitting and employ a range of intermediate redox mediators such as quinone derivatives to aid this process. Drawing on this natural example, we show that a low molecular weight quinone derivative is capable of decoupling H2 evolution from O2 evolution at scale during electrochemical Water splitting. This work could significantly lower the cost of ECPBs, paving the way for their more widespread adoption in Water splitting.

Richard V Jones - One of the best experts on this subject based on the ideXlab platform.

  • continuous flow high pressure hydrogenation reactor for optimization and high throughput synthesis
    ACS Combinatorial Science, 2006
    Co-Authors: Richard V Jones, Lajos Godorhazy, Varga Norbert, Daniel Szalay, Laszlo Urge, Ferenc Darvas
    Abstract:

    This paper reports on a novel continuous-flow hydrogenation reactor and its integration with a liquid handler to generate a fully automated high-throughput hydrogenation system for library synthesis. The reactor, named the H-Cube, combines endogenous hydrogen generation from the Electrolysis of Water with a continuous flow-through system. The system makes significant advances over current batch hydrogenation reactors in terms of safety, reaction validation efficiency, and rates of reaction. The hydrogenation process is described along with a detailed description of the device's main parts. The reduction of a series of functional groups, varying in difficulty up to 70 degrees C and 70 bar are also described. The paper concludes with the integration of the device into an automated liquid handler followed by the reduction of a nitro compound in a high throughput manner. The system is fully automated and can conduct 5 reactions in the time it takes to perform and workup one reaction manually on a standard batch reactor.

  • continuous flow high pressure hydrogenation reactor for optimization and high throughput synthesis
    ACS Combinatorial Science, 2006
    Co-Authors: Richard V Jones, Lajos Godorhazy, Daniel Szalay, Laszlo Urge, Norbert Varga, Ferenc Darvas
    Abstract:

    This paper reports on a novel continuous-flow hydrogenation reactor and its integration with a liquid handler to generate a fully automated high-throughput hydrogenation system for library synthesis. The reactor, named the H-Cube, combines endogenous hydrogen generation from the Electrolysis of Water with a continuous flow-through system. The system makes significant advances over current batch hydrogenation reactors in terms of safety, reaction validation efficiency, and rates of reaction. The hydrogenation process is described along with a detailed description of the device's main parts. The reduction of a series of functional groups, varying in difficulty up to 70 °C and 70 bar are also described. The paper concludes with the integration of the device into an automated liquid handler followed by the reduction of a nitro compound in a high throughput manner. The system is fully automated and can conduct 5 reactions in the time it takes to perform and workup one reaction manually on a standard batch reactor.

Nelson A. Kelly - One of the best experts on this subject based on the ideXlab platform.

  • optimization of solar powered hydrogen production using photovoltaic Electrolysis devices
    International Journal of Hydrogen Energy, 2008
    Co-Authors: Thomas L. Gibson, Nelson A. Kelly
    Abstract:

    Abstract Hydrogen fuel for fuel cell vehicles can be produced by using solar electric energy from photovoltaic (PV) modules for the Electrolysis of Water without emitting carbon dioxide or requiring fossil fuels. In the past, this renewable means of hydrogen production has suffered from low efficiency (2–6%), which increased the area of the PV array required and therefore, the cost of generating hydrogen. In this research, the efficiency of the PV-Electrolysis system was optimized by matching the voltage and maximum power output of the photovoltaics to the operating voltage of proton exchange membrane (PEM) electrolyzers. The optimization process increased the hydrogen generation efficiency to 12% for a solar powered PV-PEM electrolyzer that could supply enough hydrogen to operate a fuel cell vehicle.

  • a solar powered high efficiency hydrogen fueling system using high pressure Electrolysis of Water design and initial results
    International Journal of Hydrogen Energy, 2008
    Co-Authors: Nelson A. Kelly, Thomas L. Gibson, David B Ouwerkerk
    Abstract:

    Abstract Hydrogen for fuel-cell electric vehicles (FCEVs) was produced using clean, renewable solar energy to electrolyze Water. This report describes the design, construction, and initial performance testing of a solar hydrogen fueler at the GM Proving Ground in Milford, MI. The system used high-efficiency photovoltaic (PV) modules, a high-pressure (6500 psi, 44.8 MPa) electrolyzer, and an optimized direct connection between the PV and electrolyzer systems. This resulted in world-class solar to hydrogen efficiencies as high as 9.3% (based on H2 lower heating value, LHV). The system could potentially supply approximately 0.5 kg of hydrogen per day from solar power for the average solar insolation in Detroit; more hydrogen would be produced in locations with more abundant sunshine. This is sufficient hydrogen to operate an FCEV for an average daily urban commute. Thus, the solar hydrogen fueler testing served as a “proof of concept” for clean, renewable hydrogen with potential applications including convenient, clean, quiet, small-scale home fueling of FCEVs (that can contribute to the growth of a future FCEV fleet) and fueling in remote locations where grid electricity is not available.

Laszlo Urge - One of the best experts on this subject based on the ideXlab platform.

  • continuous flow high pressure hydrogenation reactor for optimization and high throughput synthesis
    ACS Combinatorial Science, 2006
    Co-Authors: Richard V Jones, Lajos Godorhazy, Varga Norbert, Daniel Szalay, Laszlo Urge, Ferenc Darvas
    Abstract:

    This paper reports on a novel continuous-flow hydrogenation reactor and its integration with a liquid handler to generate a fully automated high-throughput hydrogenation system for library synthesis. The reactor, named the H-Cube, combines endogenous hydrogen generation from the Electrolysis of Water with a continuous flow-through system. The system makes significant advances over current batch hydrogenation reactors in terms of safety, reaction validation efficiency, and rates of reaction. The hydrogenation process is described along with a detailed description of the device's main parts. The reduction of a series of functional groups, varying in difficulty up to 70 degrees C and 70 bar are also described. The paper concludes with the integration of the device into an automated liquid handler followed by the reduction of a nitro compound in a high throughput manner. The system is fully automated and can conduct 5 reactions in the time it takes to perform and workup one reaction manually on a standard batch reactor.

  • continuous flow high pressure hydrogenation reactor for optimization and high throughput synthesis
    ACS Combinatorial Science, 2006
    Co-Authors: Richard V Jones, Lajos Godorhazy, Daniel Szalay, Laszlo Urge, Norbert Varga, Ferenc Darvas
    Abstract:

    This paper reports on a novel continuous-flow hydrogenation reactor and its integration with a liquid handler to generate a fully automated high-throughput hydrogenation system for library synthesis. The reactor, named the H-Cube, combines endogenous hydrogen generation from the Electrolysis of Water with a continuous flow-through system. The system makes significant advances over current batch hydrogenation reactors in terms of safety, reaction validation efficiency, and rates of reaction. The hydrogenation process is described along with a detailed description of the device's main parts. The reduction of a series of functional groups, varying in difficulty up to 70 °C and 70 bar are also described. The paper concludes with the integration of the device into an automated liquid handler followed by the reduction of a nitro compound in a high throughput manner. The system is fully automated and can conduct 5 reactions in the time it takes to perform and workup one reaction manually on a standard batch reactor.