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RISS 인기검색어
- 검색키워드
- 저자 : James A . Guin ( Young Woo Rhee ) (검색결과 10 건)
- 무료
- 기관 내 무료
- 유료
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MODELING OF COAL LIQUEFACTION WITH HINDERED DIFFUSION
Rhee, Young Woo,Guin, James A 한국화학공학회 1993 Korean Journal of Chemical Engineering Vol.10 No.1
A simple model taking into account most important aspects of catalyst properties and reaction was developed to interpret a maximal point in catalyst activity observed using unimodal catalysts in coal-tetralin reactions. The model was found to be highly applicable to the prediction of catalyst activity and the maximal point in catalyst activity could be explained in terms of the trade-off between the hindered diffusion and surface area.
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Preparation of Alumina Catalyst Supports and NiMo / Al2O3 Catalysts
Young Woo Rhee,James A . Guin 한국화학공학회 1993 화학공업과 기술 Vol.11 No.5
N/A Several alumina catalysts were prepared to investigate effects of catalyst preparation variables on pore structure, including sintering time and temperature, acid type, and fiber type and loading. Each catalyst was characterized with a porosimeter and sorptomeler in terms of pore size distribution, average pore diameters, pore volumes, densities and surface area. Bimodal NiMo catalysts were effectively prepared without Losing surface area by using a combined method of coextrusion and fiber incorporation.
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Effect of Catalyst Pore Structure on Effective Diffusivity
Young Woo Rhee,James A . Guin 한국화학공학회 1994 화학공업과 기술 Vol.12 No.2
N/A The effective diffusivity of the catalyst was experimentally measured in both octane-decane and polystyrene-chloroform systems for comparison with effects identified in the coal liquefaction model work. The diffusivity data were in good agreement with the theoretical solution and their reproducibility was satisfactory. In both experimental systems, the effective diffitsivity was strongly dependent upon the ratio of diffusing species to catalyst pore size. When the steric exclusion-hydrodynamic drag theory was applied, the tortuosity significantly varied with the ratio of diffusing molecule to catalyst pore size. Using the diffusivity data of unimodal catalysts, an empirical equation relating the size ratio to the restrictive factor was derived to evaluate the diffusivity data of bimodal catalysts.
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Effect of Catalyst Pore Structure on Effective Diffusivity
Guin, James A,Rhee, Young Woo 한국화학공학회 1994 NICE Vol.12 No.2
The effective diffusivity of the catalyst was experimentally measured in both octane-decane and polystyrene-chloroform systems for comparison with effects identified in the coal liquefaction model work. The diffusivity data were in good agreement with the theoretical solution and their reproducibility was satisfactory. In both experimental systems, the effective diffitsivity was strongly dependent upon the ratio of diffusing species to catalyst pore size. When the steric exclusion-hydrodynamic drag theory was applied, the tortuosity significantly varied with the ratio of diffusing molecule to catalyst pore size. Using the diffusivity data of unimodal catalysts, an empirical equation relating the size ratio to the restrictive factor was derived to evaluate the diffusivity data of bimodal catalysts.
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Preparation of Alumina Catalyst Supports and NiMo/Al2O3 Catalysts
Guin, James A,Rhee, Young Woo 한국화학공학회 1993 NICE Vol.11 No.5
Several alumina catalysts were prepared to investigate effects of catalyst preparation variables on pore structure, including sintering time and temperature, acid type, and fiber type and loading. Each catalyst was characterized with a porosimeter and sorptomeler in terms of pore size distribution, average pore diameters, pore volumes, densities and surface area. Bimodal NiMo catalysts were effectively prepared without Losing surface area by using a combined method of coextrusion and fiber incorporation.
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Modeling of Coal Liquefaction with Hindered Diffusion
Guin, James A,Rhee, Young Woo 한국화학공학회 1993 NICE Vol.11 No.5
A simple model taking into account most important aspects of catalyst properties and reaction was developed to interpret a maximal point in catalyst activity observed using unimodal catalysts in coal-tetralin reactions. The model was found to be highly applicable to the prediction of catalyst activity and the maximal point in catalyst activity could be explained in terms of the trade-off between the hindered diffusion and surface area.
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EFFECT OF CATALYST PORE STRUCTURE ON EFFECTIVE DIFFUSIVITY
Rhee, Young Woo,Guin, James A 한국화학공학회 1994 Korean Journal of Chemical Engineering Vol.11 No.1
The effective diffusivity of the catalyst was experimentally measured in both octanedecane and polystyrene-chloroform systems for comparison with effects identified in the coal liquefaction model work. The diffusivity data were in good agreement with the theoretical solution and their reproducibility was satisfactory. In both experimental systems, the effective diffusivity was strongly dependent upon the ratio of diffusing species to catalyst pore sue. When the steric exclusion-hydrodynamic drag theory was applied, the tortuosity significantly varied with the ratio of diffusing molecule to catalyst pore size. Using the diffiisivity data of unimodal catalysts, an empirical equation relating the size ratio to the restrictive factor was derived to evaluate the diffusivity data of bimodal catalysts.
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PREPARATION OF ALUMINA CATALYST SUPPORTS AND NiMo/Al2O3 CATALYSTS
Rhee, Young Woo,Guin, James A 한국화학공학회 1993 Korean Journal of Chemical Engineering Vol.10 No.2
Several alumina catalysts were prepared to investigate effects of catalyst preparation variables on pore structure, including sintering time and temperature, acid type, and fiber type and loading. Each catalyst was characterized with a porosimeter and sorptometer in terms of pore size distribution, average pore diameters, pore volumes, densities and surface area. Bimodal NiMo catalysts were effectively prepared without losing surface area by using a combined method of coextrusion and fiber incorporation.
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Modeling of Coal Liquefaction with Hindered Diffusion
Young Woo Rhee,James A . Guin 한국화학공학회 1993 화학공업과 기술 Vol.11 No.5
N/A A simple model taking into account most important aspects of catalyst properties and reaction was developed to interpret a maximal point in catalyst activity observed using unimodal catalysts in coal-tetralin reactions. The model was found to be highly applicable to the prediction of catalyst activity and the maximal point in catalyst activity could be explained in terms of the trade-off between the hindered diffusion and surface area.
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이영우,James A . Guin ( Young Woo Rhee ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.1
The effects of catalyst pore structure on the catalyst activity observed in the catalytic hydrodesulfurization reactions of asphaltenes were studied. In the simplified model, effective diffusivity and surface area were calculated using important physical properties of catalyst and the experimental hydrodesulfurization activity was analyzed based on this calculation. The existence of a maximal point in catalyst activity observed in the reaction could be explained in terms of the trade-off between the effective diffusivity and surface area.
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