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CO₂ Reforming of Methane over Ni on MgO-Precoated Al₂O₃
Zhong-Wen Liu,Hyun-Seong Roh,전기원,H. S. Potdar,Min Ji 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.5
The effects of MgO loading and calcination temperature of the catalysts on the carbon dioxide reforming of methane (CDR) have been extensively investigated over Ni/MgO/Al2O3 catalysts in a fixed-bed reactor system. Results indicate that the activity and stability of the catalysts were significantly influenced by both MgO loading and calcination temperature, i.e., higher calcination temperature and higher MgO loading are essential for high activity and stability of the catalyst. Characterization results indicate that mixed spinel phase composed of MgAl2O4 and NiAl2O4 is effective to produce active and stable Ni species having strong Ni to support interaction resulting in active and stable catalytic performance in CDR.
Carbon Dioxide Reforming of Methane over Ni/CaO/Al₂O₃
Roh, Hyun-Seog,Liu, Zhong-Wen,Potdar, H.S.,Kim, Jae-Woo,Jun, Ki-Won 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.6
Ni catalysts supported on CaO-precoated A1₂0₃ were prepared and characterized by BET, XRD and TPR techniques. The Ni/CaO/A1₂O₃ catalysts with various CaO loadings were applied to carbon dioxide refonning of CH₄. All the catalysts showed a fairly good stability but the activity of Ni/CaO/A1₂O₃ depended upon the amount of CaO. Among the catalysts tested, the Ni/CaO/A1₂O₃ catalyst with a Ca/AI ratio of 0.04 exhibited the highest activity and stability. The interaction between Ni and the support was changed with the addition of CaO and the variation of Ca/Al ratio. Based on the characterization results, the promotional effect of CaO on Ni/-Al₂O₃ resulted from (1) the interaction between Ni and CaO, (2) the stabilization of CaO on A1₂O₃; and (3) the strong basicity of CaO. It was suggested that the highly dispersed CaO species are effective to obtain active and stable Ni/CaO/Al₂O₃; catalysts in carbon dioxide reforming of methane.
Carbon Dioxide Reforming of Methane over Ni/CaO/Al₂O₃
Hyun-Seog Roh,Zhong-Wen Liu,H. S. Potdar,Jae-Woo Kim,전기원 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.6
Ni catalysts supported on CaO-precoated Al2O3 were prepared and characterized by BET, XRD and TPR techniques. The Ni/CaO/Al2O3 catalysts with various CaO loadings were applied to carbon dioxide reforming of CH4. All the catalysts showed a fairly good stability but the activity of Ni/CaO/Al2O3 depended upon the amount of CaO. Among the catalysts tested, the Ni/CaO/Al2O3 catalyst with a Ca/Al ratio of 0.04 exhibited the highest activity and stability. The interaction between Ni and the support was changed with the addition of CaO and the variation of Ca/Al ratio. Based on the characterization results, the promotional effect of CaO on Ni/-Al2O3 resulted from (1) the interaction between Ni and CaO, (2) the stabilization of CaO on Al2O3 and (3) the strong basicity of CaO. It was suggested that the highly dispersed CaO species are effective to obtain active and stable Ni/CaO/Al2O3 catalysts in carbon dioxide reforming of methane.
CO₂ Reforming of Methane over Ni on MgO-Precoated Al₂O₃
Liu, Zhong-Wen,Roh, Hyun-Seog,Jun, Ki-Won,Potdar, H. S.,Ji, Min 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.5
The effects of MgO loading and calcination temperature of the catalysts on the carbon dioxide reforming of methane (CDR) have been extensively investigated over Ni/MgO/Al₂0₃ catalysts in a fixed-bed reactor system. Results indicate that the activity and stability of the catalysts were significantly influenced by both MgO loading and calcination temperature, i.e., higher calcination temperature and higher MgO loading are essential for high activity and stability of the catalyst. Characterization results indicate that mixed spinel phase composed of MgA1₂0 ^4 and NiAl₂O^4 is effective to produce active and stable Ni species having strong Ni to support interaction resulting in active and stable catalytic performance in CDR.