Assessment Report of Doctoral Theses

化物ガラスにおける遷移金属イオンの原子価制御[村田]メタンおよび水素を燃料とするエネルギー変換のための触媒材料の開発[関澤]Studies of Si Epitaxial Deposition at Low Temperature Using an Electron Cyclotron Resonance Plasma[高

学位論文審査報告

化物ガラスにおける遷移金属イオンの原子価制御[村田]メタンおよび水素を燃料とするエネルギー変換のための触媒材料の開発[関澤]Studies of Si Epitaxial Deposition at Low Temperature Using an Electron Cyclotron Resonance Plasma[高

Kinetic Processes of Methane Combustion over Hexaaluminate Catalysts

Kinetic analysis by direct curve fitting was performed on catalytic combustion of methane over Mn-substituted hexaaluminates. The analysis provided useful information in understanding the complicated interaction among the surface catalyzed reaction, the mass transfer process, and the gas phase reaction. The large surface area catalyst is effective in promoting the combustion reaction under the limitation of mass transfer. At higher temperatures, strong interaction between surface catalyzed and gas phase reactions takes place because the thermal formation of radical species, which are necessary for the initiation of gas phase reactions, is suppressed by the surface catalyzed oxidation

Fabrication of porous Ceramic Catalyst with High Gas Permeability

Porous ceramic catalysts were fabricated by using hexaaluminate (BaMnAl11O19-alpha) as a base material. The two-stage sintering of hexaaluminate powders produced large macropores (>10,μm), being effective in increasing gas permeability. The gas permeability of two-stage sintered hexaaluminate increased with elevating the first-stage sintering temperature and with lowering the second-stage sintering temperature. Calcination of alkoxide-derived gel produced the bulk sample, which showed the gas permeabilities higher than those of the two-stage sintering sample. Thermal decomposition of polyethylene dispersed in gel appears to form macropores (>10,μm) in a heating process. The porous ceramic catalyst thus obtained showed the high catalytic activity for methane combustion

高速ガス透過能と参加触媒能を有するセラミック多孔体の作製

Porous ceramic catalysts were fabricated by using hexaaluminate (BaMnAl11O19-alpha) as a base material. The two-stage sintering of hexaaluminate powders produced large macropores (>10,μm), being effective in increasing gas permeability. The gas permeability of two-stage sintered hexaaluminate increased with elevating the first-stage sintering temperature and with lowering the second-stage sintering temperature. Calcination of alkoxide-derived gel produced the bulk sample, which showed the gas permeabilities higher than those of the two-stage sintering sample. Thermal decomposition of polyethylene dispersed in gel appears to form macropores (>10,μm) in a heating process. The porous ceramic catalyst thus obtained showed the high catalytic activity for methane combustion

ヘキサアルミネート触媒を用いたメタン燃焼の速度過程

Kinetic analysis by direct curve fitting was performed on catalytic combustion of methane over Mn-substituted hexaaluminates. The analysis provided useful information in understanding the complicated interaction among the surface catalyzed reaction, the mass transfer process, and the gas phase reaction. The large surface area catalyst is effective in promoting the combustion reaction under the limitation of mass transfer. At higher temperatures, strong interaction between surface catalyzed and gas phase reactions takes place because the thermal formation of radical species, which are necessary for the initiation of gas phase reactions, is suppressed by the surface catalyzed oxidation