Carbon dioxide reforming of methane over Ni/CaO/Al2O3

Ni catalysts Supported on CaO-precoated Al2O3, were prepared and characterized by BET, XRD and TPR techniques. The Ni/CaO/Al2O3 catalysts kith 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 CA 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 obtain active and stable Ni/CaO/Al2O3 catalysts in carbon dioxide reforming of methane.