Jai-woh Kim - Academia.edu (original) (raw)

Uploads

Papers by Jai-woh Kim

Research paper thumbnail of The Prediction of Binary Gas Mixture Adsorption Equilibria from Single Component Adsorption Isotherms Based on Vacancy Solution Model

Korean Journal of Chemical Engineering, 1989

ABSTRACT

Research paper thumbnail of The Effect of Anode Thickness on the Performance of Anode-Supported Solid Oxide Fuel Cells

Research paper thumbnail of Catalytic and thermal effects in the upgrading of bitumen-derived heavy oils (Abstract only)

abstractHeavy oils derived from PR Spring bitumen were hydrotreated in the fixed bed reactor as a... more abstractHeavy oils derived from PR Spring bitumen were hydrotreated in the fixed bed reactor as a function of process variables. The presulfided commercial NiMo/y-alumina (HDN) catalyst, Mo supported on y-alumina (HDM) catalyst and sodium-impregnated HDN catalyst support were used in this study to investigate catalytic and thermal reactions during heavy oil hydrotreating. The process variables studied were reactor temperature (625-685 K), liquid hourly space velocity (0.14-0.80 hr-1) and pressure (11.1-16.6 MPa). The hydrogen-to-oil ratio was fixed at 890 m3/m3 (5000 scf H2/bbl) in all experiments. A parallel-consecutive reaction model was used to model nitrogen, sulfur, and nickel removal and Conradson carbon and residuum conversion. Nitrogen removal over the HDN catalyst and the HDM catalyst could be modeled by a power rate law equation A comparison of the catalytic performance of the HDN catalyst, HDM catalyst, and sodium-impregnated HDN catalyst support was made in terms of hete...

Research paper thumbnail of Flat fuel cell stack solid oxide with metal-foil-interconnectors

Research paper thumbnail of Defense Technical Information Center Compilation Part Notice ADPO 11210 TITLE : The Role of Electrode Microstructure on Activation and Concentration Polarizations in Solid Oxide Fuel Cells

Activation and concentration polarization effects in anode-supported solid oxide fuel cells (SOFC... more Activation and concentration polarization effects in anode-supported solid oxide fuel cells (SOFC) were examined. The anode and the cathode consisted respectively of porous, composite, contiguous mixtures of Ni + yttria-stabilized zirconia (YSZ) and Sr-doped LaMnO 3 (LSM) + YSZ. The composite electrode provides parallel paths for oxygen ions (through YSZ), electrons (through the electronic conductor; Ni for the anode and LSM for the cathode), and gaseous species (through the pores) and thereby substantially decreases the activation polarization. The composite electrode effectively spreads the charge transfer reaction from the electrolyte/electrode interface into the electrode. At low current densities where the activation polarization can be approximated as being ohmic, an effective charge transfer resistance, R"f , is defined in terms of various parameters, including the intrinsic charge transfer resistance, Rct which is a characteristic of the electrocatalyst/ electrolyte pai...

Research paper thumbnail of The Effect of Anode Thickness on the Performance of Anode-Supported Solid Oxide Fuel Cells

ECS Proceedings Volumes, 1999

Research paper thumbnail of The Prediction of Binary Gas Mixture Adsorption Equilibria from Single Component Adsorption Isotherms Based on Vacancy Solution Model

Korean Chemical Engineering Research

ABSTRACT

Research paper thumbnail of The role of electrode microstructure on activation and concentration polarizations in solid oxide fuel cells

Research paper thumbnail of Polarization effects in intermediate temperature, anode-supported solid oxide fuel cells

Journal of The Electrochemical Society, 1999

Anode-supported solid oxide fuel cells with yttria-stabilized zirconia (YSZ) electrolyte, Sr-dope... more Anode-supported solid oxide fuel cells with yttria-stabilized zirconia (YSZ) electrolyte, Sr-doped (LSM) + YSZ cathode, and Ni + YSZ anode were fabricated and their performance was evaluated between 650 and 800°C with humidified hydrogen as the fuel and air as the oxidant. ...

Research paper thumbnail of Upgrading of bitumen-derived heavy oils over a commercial HDN catalyst

Fuel, 1997

The hydrotreatment of PR Spring bitumen-derived heavy oils was achieved in a fixed-bed reactor ov... more The hydrotreatment of PR Spring bitumen-derived heavy oils was achieved in a fixed-bed reactor over presulfided commercial NiMo/alumina hydrodenitrogenation catalysts. The extents of heteroatom and metal removal and of Conradson carbon residue (CCR) and residuum (> 811 K) conversion were determined as a function of process operating variables: temperature (625–685 K) and liquid hourly space velocity (0.14–0.80 h−1). Pressure and

Research paper thumbnail of Catalytic and thermal effects during hydrotreating of bitumen-derived heavy oils

Fuel, 1998

... HDN catalyst. NiO (wt.%), 3.8. MoO 3 (wt.%), 19.5. Al 2 O 3 (wt.%), 76.7. Pore volume (cm 3 g... more ... HDN catalyst. NiO (wt.%), 3.8. MoO 3 (wt.%), 19.5. Al 2 O 3 (wt.%), 76.7. Pore volume (cm 3 g −1 ), 0.47. Surface area (m 2 g −1 ), 155. 1.3 mm trilobe extrudates, HDM catalyst. MoO 3 (wt.%), 6.0. Al 2 O 3 (wt.%), 94. Pore volume (cm 3 g −1 ), 0.85. Surface area (m 2 g −1 ), 130. ...

Research paper thumbnail of Thermal conversion of PR Spring bitumen-derived heavy oil in the presence of Na/alumina

Fuel Processing Technology, 1998

Research paper thumbnail of Catalytic hydrotreatment of PR spring bitumen over an HDM catalyst

Research paper thumbnail of The Prediction of Binary Gas Mixture Adsorption Equilibria from Single Component Adsorption Isotherms Based on Vacancy Solution Model

Korean Journal of Chemical Engineering, 1989

ABSTRACT

Research paper thumbnail of The Effect of Anode Thickness on the Performance of Anode-Supported Solid Oxide Fuel Cells

Research paper thumbnail of Catalytic and thermal effects in the upgrading of bitumen-derived heavy oils (Abstract only)

abstractHeavy oils derived from PR Spring bitumen were hydrotreated in the fixed bed reactor as a... more abstractHeavy oils derived from PR Spring bitumen were hydrotreated in the fixed bed reactor as a function of process variables. The presulfided commercial NiMo/y-alumina (HDN) catalyst, Mo supported on y-alumina (HDM) catalyst and sodium-impregnated HDN catalyst support were used in this study to investigate catalytic and thermal reactions during heavy oil hydrotreating. The process variables studied were reactor temperature (625-685 K), liquid hourly space velocity (0.14-0.80 hr-1) and pressure (11.1-16.6 MPa). The hydrogen-to-oil ratio was fixed at 890 m3/m3 (5000 scf H2/bbl) in all experiments. A parallel-consecutive reaction model was used to model nitrogen, sulfur, and nickel removal and Conradson carbon and residuum conversion. Nitrogen removal over the HDN catalyst and the HDM catalyst could be modeled by a power rate law equation A comparison of the catalytic performance of the HDN catalyst, HDM catalyst, and sodium-impregnated HDN catalyst support was made in terms of hete...

Research paper thumbnail of Flat fuel cell stack solid oxide with metal-foil-interconnectors

Research paper thumbnail of Defense Technical Information Center Compilation Part Notice ADPO 11210 TITLE : The Role of Electrode Microstructure on Activation and Concentration Polarizations in Solid Oxide Fuel Cells

Activation and concentration polarization effects in anode-supported solid oxide fuel cells (SOFC... more Activation and concentration polarization effects in anode-supported solid oxide fuel cells (SOFC) were examined. The anode and the cathode consisted respectively of porous, composite, contiguous mixtures of Ni + yttria-stabilized zirconia (YSZ) and Sr-doped LaMnO 3 (LSM) + YSZ. The composite electrode provides parallel paths for oxygen ions (through YSZ), electrons (through the electronic conductor; Ni for the anode and LSM for the cathode), and gaseous species (through the pores) and thereby substantially decreases the activation polarization. The composite electrode effectively spreads the charge transfer reaction from the electrolyte/electrode interface into the electrode. At low current densities where the activation polarization can be approximated as being ohmic, an effective charge transfer resistance, R"f , is defined in terms of various parameters, including the intrinsic charge transfer resistance, Rct which is a characteristic of the electrocatalyst/ electrolyte pai...

Research paper thumbnail of The Effect of Anode Thickness on the Performance of Anode-Supported Solid Oxide Fuel Cells

ECS Proceedings Volumes, 1999

Research paper thumbnail of The Prediction of Binary Gas Mixture Adsorption Equilibria from Single Component Adsorption Isotherms Based on Vacancy Solution Model

Korean Chemical Engineering Research

ABSTRACT

Research paper thumbnail of The role of electrode microstructure on activation and concentration polarizations in solid oxide fuel cells

Research paper thumbnail of Polarization effects in intermediate temperature, anode-supported solid oxide fuel cells

Journal of The Electrochemical Society, 1999

Anode-supported solid oxide fuel cells with yttria-stabilized zirconia (YSZ) electrolyte, Sr-dope... more Anode-supported solid oxide fuel cells with yttria-stabilized zirconia (YSZ) electrolyte, Sr-doped (LSM) + YSZ cathode, and Ni + YSZ anode were fabricated and their performance was evaluated between 650 and 800°C with humidified hydrogen as the fuel and air as the oxidant. ...

Research paper thumbnail of Upgrading of bitumen-derived heavy oils over a commercial HDN catalyst

Fuel, 1997

The hydrotreatment of PR Spring bitumen-derived heavy oils was achieved in a fixed-bed reactor ov... more The hydrotreatment of PR Spring bitumen-derived heavy oils was achieved in a fixed-bed reactor over presulfided commercial NiMo/alumina hydrodenitrogenation catalysts. The extents of heteroatom and metal removal and of Conradson carbon residue (CCR) and residuum (> 811 K) conversion were determined as a function of process operating variables: temperature (625–685 K) and liquid hourly space velocity (0.14–0.80 h−1). Pressure and

Research paper thumbnail of Catalytic and thermal effects during hydrotreating of bitumen-derived heavy oils

Fuel, 1998

... HDN catalyst. NiO (wt.%), 3.8. MoO 3 (wt.%), 19.5. Al 2 O 3 (wt.%), 76.7. Pore volume (cm 3 g... more ... HDN catalyst. NiO (wt.%), 3.8. MoO 3 (wt.%), 19.5. Al 2 O 3 (wt.%), 76.7. Pore volume (cm 3 g −1 ), 0.47. Surface area (m 2 g −1 ), 155. 1.3 mm trilobe extrudates, HDM catalyst. MoO 3 (wt.%), 6.0. Al 2 O 3 (wt.%), 94. Pore volume (cm 3 g −1 ), 0.85. Surface area (m 2 g −1 ), 130. ...

Research paper thumbnail of Thermal conversion of PR Spring bitumen-derived heavy oil in the presence of Na/alumina

Fuel Processing Technology, 1998

Research paper thumbnail of Catalytic hydrotreatment of PR spring bitumen over an HDM catalyst

Log In