A Ni-Ce/MgAl2O4 catalyst was prepared by the co-impregnation method by adjusting the Ce/Ni ratio in a range of 0.0-1.0 for the combined steam and carbon dioxide reforming of methane (CSCRM). The characterization as to surface area, metal dispersion, NiO crystallite size as well as reduction temperature and basicity of prepared catalysts was analyzed by BET, H2-chemisroption, XRD, TPR and CO2-TPD. The used catalysts were collected to investigate the coke formation and surface characteristics through SEM, TGA, XPS and Raman analysis. The Ce addition to Ni/MgAl2O4 catalyst has significant effects on the NiO crystallite size, metal dispersion and reduction degree. The Ni-Ce/MgAl 2O4 catalyst with the Ce/Ni ratio of 0.25 showed the smallest NiO crystallite size of 8.3 nm and the highest metal dispersion of 4.91%. Meanwhile, in the Ni/MgAl2O4 (Ce/Ni = 0) catalyst, the NiO crystallite size was found to be as large as 11.0 nm and showed a low metal dispersion of 3.49%. The Ni-Ce/MgAl2O4 (Ce/Ni = 0.25) catalyst shows the highest activity and coke resistance in CSCRM due to the improvement of metal dispersion, excellent reducibility as well as effective surface oxygen transfer as evidenced by XPS results.
Bibliographical noteFunding Information:
This work was conducted under the framework of Research and Development Program of the Korea Institute of Energy Research (KIER) (B3-2413). This work was supported by the Energy Efficiency & Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Knowledge Economy ( 20122010200040 ).
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology