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No-kuk Park - One of the best experts on this subject based on the ideXlab platform.

  • Optimization of Nickel-Based Catalyst Composition and Reaction Conditions for the Prevention of Carbon Deposition in Toluene Reforming
    Energies, 2019
    Co-Authors: No-kuk Park, Tae-jin Lee, Young Jin Lee, Byung Chan Kwon, Suk Hwan Kang, Bum Ui Hong, Taejin Kim
    Abstract:

    In this study, Nickel-Based reforming Catalysts were synthesized for the reforming of toluene, a major component of thinners and widely used as an organic solvent. The reaction characteristics of these Catalysts were investigated by both steam reforming and auto-thermal reforming. Reforming aromatic hydrocarbons like toluene to produce synthesis gas is difficult because carbon deposition also occurs, and the deposition of carbon lowers the activity of the Catalyst and causes a pressure drop during the reaction process. In order to maintain a stable reforming process, a catalytic reaction technique capable of suppressing carbon deposition is required. Steam reforming and auto-thermal reforming of toluene were used in this study, and the temperature of the Catalyst bed was remarkably reduced, due to a strong endothermic reaction during the reforming process. By using scanning electric microscopy (SEM), X-ray diffraction (XRD), and temperature-programmed oxidation analysis, it is shown that carbon deposition was markedly generated due to a Catalyst bed temperature decrease. In this study, optimum conditions for Catalyst composition and the reforming reaction are proposed to suppress the formation of carbon on the Catalyst surface, and to remove the generated carbon from the process. In addition, ceria and zirconia were added as catalytic promoters to inhibit carbon deposition on the Catalyst surface, and the carbon deposition phenomena according to the Catalyst’s promoter content were investigated. The results showed that the carbon deposition inhibition function of CeO2, via its redox properties, is insignificant in steam reforming, but is notably effective in the auto-thermal reforming of toluene.

  • Preparation of micro-channel catalytic reactor coated with macro-porous Al2O3 for fuel reformer
    International Journal of Precision Engineering and Manufacturing, 2014
    Co-Authors: No-kuk Park, Tae-jin Lee
    Abstract:

    Macroporous ordered alumina was synthesized in a micro-channel reactor, using polystyrene colloidal spherical nano-beads as a template for the formation of the macro pores. A 0.1 M aluminum nitrate solution, used as the precursor for the synthesis of alumina, was mixed with a polystyrene colloidal solution at a volumetric ratio of 1:1. In this study, SUS-316, stainless steel material was used as a micro-channel plate and the buffer layer was homogeneously coated over the micro-channel plate. Scanning electron microscopy confirmed the synthesis of high quality ordered macro porous alumina over the micro channels through the application of a buffer layer. To use the ordered macro porous alumina as a catalytic support, the precursor of the active components, Ni, was added to a mixed solution of the aluminum precursor and polystyrene colloid. A channel type heat exchange reactor was used as a fuel reformer for SOFC in this study. The macro-porous Ni-Al2O3 based Catalyst coated over the micro-channel plate was inserted into the outside channel. It could be confirmed through this study that the efficiency of heat exchange was enhanced through the use of the micro-channel plate, and the metal foam and the catalytic activity of nickel based Catalyst for reforming of dodecane was improved through the use of the macro-porous alumina support.

  • Preparation of micro-channel catalytic reactor coated with macro-porous Al_2O_3 for fuel reformer
    International Journal of Precision Engineering and Manufacturing, 2014
    Co-Authors: No-kuk Park, Tae-jin Lee
    Abstract:

    Macroporous ordered alumina was synthesized in a micro-channel reactor, using polystyrene colloidal spherical nano-beads as a template for the formation of the macro pores. A 0.1 M aluminum nitrate solution, used as the precursor for the synthesis of alumina, was mixed with a polystyrene colloidal solution at a volumetric ratio of 1:1. In this study, SUS-316, stainless steel material was used as a micro-channel plate and the buffer layer was homogeneously coated over the micro-channel plate. Scanning electron microscopy confirmed the synthesis of high quality ordered macro porous alumina over the micro channels through the application of a buffer layer. To use the ordered macro porous alumina as a catalytic support, the precursor of the active components, Ni, was added to a mixed solution of the aluminum precursor and polystyrene colloid. A channel type heat exchange reactor was used as a fuel reformer for SOFC in this study. The macro-porous Ni-Al_2O_3 based Catalyst coated over the micro-channel plate was inserted into the outside channel. It could be confirmed through this study that the efficiency of heat exchange was enhanced through the use of the micro-channel plate, and the metal foam and the catalytic activity of nickel based Catalyst for reforming of dodecane was improved through the use of the macro-porous alumina support.

Tae-jin Lee - One of the best experts on this subject based on the ideXlab platform.

  • Optimization of Nickel-Based Catalyst Composition and Reaction Conditions for the Prevention of Carbon Deposition in Toluene Reforming
    Energies, 2019
    Co-Authors: No-kuk Park, Tae-jin Lee, Young Jin Lee, Byung Chan Kwon, Suk Hwan Kang, Bum Ui Hong, Taejin Kim
    Abstract:

    In this study, Nickel-Based reforming Catalysts were synthesized for the reforming of toluene, a major component of thinners and widely used as an organic solvent. The reaction characteristics of these Catalysts were investigated by both steam reforming and auto-thermal reforming. Reforming aromatic hydrocarbons like toluene to produce synthesis gas is difficult because carbon deposition also occurs, and the deposition of carbon lowers the activity of the Catalyst and causes a pressure drop during the reaction process. In order to maintain a stable reforming process, a catalytic reaction technique capable of suppressing carbon deposition is required. Steam reforming and auto-thermal reforming of toluene were used in this study, and the temperature of the Catalyst bed was remarkably reduced, due to a strong endothermic reaction during the reforming process. By using scanning electric microscopy (SEM), X-ray diffraction (XRD), and temperature-programmed oxidation analysis, it is shown that carbon deposition was markedly generated due to a Catalyst bed temperature decrease. In this study, optimum conditions for Catalyst composition and the reforming reaction are proposed to suppress the formation of carbon on the Catalyst surface, and to remove the generated carbon from the process. In addition, ceria and zirconia were added as catalytic promoters to inhibit carbon deposition on the Catalyst surface, and the carbon deposition phenomena according to the Catalyst’s promoter content were investigated. The results showed that the carbon deposition inhibition function of CeO2, via its redox properties, is insignificant in steam reforming, but is notably effective in the auto-thermal reforming of toluene.

  • Preparation of micro-channel catalytic reactor coated with macro-porous Al2O3 for fuel reformer
    International Journal of Precision Engineering and Manufacturing, 2014
    Co-Authors: No-kuk Park, Tae-jin Lee
    Abstract:

    Macroporous ordered alumina was synthesized in a micro-channel reactor, using polystyrene colloidal spherical nano-beads as a template for the formation of the macro pores. A 0.1 M aluminum nitrate solution, used as the precursor for the synthesis of alumina, was mixed with a polystyrene colloidal solution at a volumetric ratio of 1:1. In this study, SUS-316, stainless steel material was used as a micro-channel plate and the buffer layer was homogeneously coated over the micro-channel plate. Scanning electron microscopy confirmed the synthesis of high quality ordered macro porous alumina over the micro channels through the application of a buffer layer. To use the ordered macro porous alumina as a catalytic support, the precursor of the active components, Ni, was added to a mixed solution of the aluminum precursor and polystyrene colloid. A channel type heat exchange reactor was used as a fuel reformer for SOFC in this study. The macro-porous Ni-Al2O3 based Catalyst coated over the micro-channel plate was inserted into the outside channel. It could be confirmed through this study that the efficiency of heat exchange was enhanced through the use of the micro-channel plate, and the metal foam and the catalytic activity of nickel based Catalyst for reforming of dodecane was improved through the use of the macro-porous alumina support.

  • Preparation of micro-channel catalytic reactor coated with macro-porous Al_2O_3 for fuel reformer
    International Journal of Precision Engineering and Manufacturing, 2014
    Co-Authors: No-kuk Park, Tae-jin Lee
    Abstract:

    Macroporous ordered alumina was synthesized in a micro-channel reactor, using polystyrene colloidal spherical nano-beads as a template for the formation of the macro pores. A 0.1 M aluminum nitrate solution, used as the precursor for the synthesis of alumina, was mixed with a polystyrene colloidal solution at a volumetric ratio of 1:1. In this study, SUS-316, stainless steel material was used as a micro-channel plate and the buffer layer was homogeneously coated over the micro-channel plate. Scanning electron microscopy confirmed the synthesis of high quality ordered macro porous alumina over the micro channels through the application of a buffer layer. To use the ordered macro porous alumina as a catalytic support, the precursor of the active components, Ni, was added to a mixed solution of the aluminum precursor and polystyrene colloid. A channel type heat exchange reactor was used as a fuel reformer for SOFC in this study. The macro-porous Ni-Al_2O_3 based Catalyst coated over the micro-channel plate was inserted into the outside channel. It could be confirmed through this study that the efficiency of heat exchange was enhanced through the use of the micro-channel plate, and the metal foam and the catalytic activity of nickel based Catalyst for reforming of dodecane was improved through the use of the macro-porous alumina support.

M. Laborde - One of the best experts on this subject based on the ideXlab platform.

  • A Kinetic Study of Ethanol Steam Reforming Using a Nickel Based Catalyst
    Topics in Catalysis, 2008
    Co-Authors: M. L. Bergamini, G. Baronetti, N. Amadeo, M. Laborde
    Abstract:

    A kinetic study of ethanol steam reforming to produce hydrogen within the region of kinetic rate control was carried out. A Ni(II)–Al(III) lamellar double hydroxide as Catalyst precursor was used. H_2, CO, CO_2 and CH_4 were obtained as products. Using the Langmuir–Hinshelwood (L–H) approach, two kinetic models were proposed. The first was a general model including four reactions, two of them corresponding to ethanol steam reforming and the other two to methane steam reforming. When high temperatures and/or high water/ethanol feed ratios were used, the system could be reduced to two irreversible ethanol steam reforming reactions.

Olaf Deutschmann - One of the best experts on this subject based on the ideXlab platform.

  • Surface Reaction Kinetics of Steam- and CO2-Reforming as Well as Oxidation of Methane over Nickel-Based Catalysts
    Catalysts, 2015
    Co-Authors: Karla H. Delgado, Henning Stotz, Alexander Zellner, Lubow Maier, Steffen Tischer, Olaf Deutschmann
    Abstract:

    An experimental and kinetic modeling study on the Ni-catalyzed conversion of methane under oxidative and reforming conditions is presented. The numerical model is based on a surface reaction mechanism consisting of 52 elementary-step like reactions with 14 surface and six gas-phase species. Reactions for the conversion of methane with oxygen, steam, and CO2 as well as methanation, water-gas shift reaction and carbon formation via Boudouard reaction are included. The mechanism is implemented in a one-dimensional flow field description of a fixed bed reactor. The model is evaluated by comparison of numerical simulations with data derived from isothermal experiments in a flow reactor over a powdered Nickel-Based Catalyst using varying inlet gas compositions and operating temperatures. Furthermore, the influence of hydrogen and water as co-feed on methane dry reforming with CO2 is also investigated.

Karla H. Delgado - One of the best experts on this subject based on the ideXlab platform.

  • Surface Reaction Kinetics of Steam- and CO2-Reforming as Well as Oxidation of Methane over Nickel-Based Catalysts
    Catalysts, 2015
    Co-Authors: Karla H. Delgado, Henning Stotz, Alexander Zellner, Lubow Maier, Steffen Tischer, Olaf Deutschmann
    Abstract:

    An experimental and kinetic modeling study on the Ni-catalyzed conversion of methane under oxidative and reforming conditions is presented. The numerical model is based on a surface reaction mechanism consisting of 52 elementary-step like reactions with 14 surface and six gas-phase species. Reactions for the conversion of methane with oxygen, steam, and CO2 as well as methanation, water-gas shift reaction and carbon formation via Boudouard reaction are included. The mechanism is implemented in a one-dimensional flow field description of a fixed bed reactor. The model is evaluated by comparison of numerical simulations with data derived from isothermal experiments in a flow reactor over a powdered Nickel-Based Catalyst using varying inlet gas compositions and operating temperatures. Furthermore, the influence of hydrogen and water as co-feed on methane dry reforming with CO2 is also investigated.

  • Surface Reaction Kinetics for Oxidation and Reforming of H2, CO, and CH4 over Nickel-Based Catalysts
    2014
    Co-Authors: Karla H. Delgado
    Abstract:

    An experimental and kinetic modeling study of H2 and CO oxidation, as well as conversion of methane under oxidative and reforming conditions over Nickel-Based Catalyst is presented. The numerical model is based on a newly developed surface reaction mechanism consisting of 52 elementary-steps reactions with 14 surface and 6 gas-phase species. The mechanism was evaluated against experimental data at varying operating conditions performed in this study and also taken from literature.