Dry reforming reaction of CH4 by CO2 was carried out over alumina-supported Ni catalysts. Main products were H2 and CO with small amount of H2O by-production because of reverse water gas shift reaction. The activity was gradually decreased with time on stream by carbon deposition. The addition of Ce component was investigated to improve the catalyst stability. The Ce addition brought decrease of carbon deposition during the reaction. The role of Ce has been considered that an inactive coke formation is significantly suppressed.

Hydrogen Production by Methane Dry Reforming on Supported Nickel Catalysts – Enhanced Stability of the Reforming Process

メタンの二酸化炭素による改質反応プロセスの強化，すなわち活性の向上と安定性の改善を目的として，そのモデルとなる，反応速度式の構築を検討した．実際の反応機構がなるべく反映される形の速度式を基本として，反応速度の分圧依存性から求めた．その結果，Ni/Al2O3触媒上での反応では，Langmuir-Hinshelwood型に類似した形式の反応速度式で表現でき，CH4に1次，CO2に−0.5次，COに−1次，H2に0次であることがわかった。これより，Ni/Al2O3触媒表面は，吸着COおよび吸着O（反応原料のCO2の解離吸着により生成）でかなり被覆されていることが示唆された。総括での反応速度式だけでなく，動作状態における触媒表面状態（吸着種中間体濃度など）もふくめた触媒反応プロセス強化の可能性が示された．

Kinetic Analysis of Syngas Formation from Carbon Dioxide (Dry Reforming of Methane with Carbon Dioxide) for Process Intensification

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Kinetic Analysis of Syngas Formation from Carbon Dioxide (Dry Reforming of Methane with Carbon Dioxide) for Process Intensification