Ni catalysts supported on CaO-precoated Al2O3 were prepared and characterized by BET, XRD and TPR techniques. The Ni/CaO/Al 2O3 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/Al 2O3 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/-Al 2O3 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.
|Number of pages||6|
|Journal||Journal of Industrial and Engineering Chemistry|
|Publication status||Published - 2003 Dec 1|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)