Citation:
MO Wen-long, MA Feng-yun, LIU Yue-e, LIU Jing-mei, ZHONG Mei, . Effect of preparation methods on the catalytic performance of Ni-Al2O3 for CO2-CH4 reforming[J]. Journal of Fuel Chemistry and Technology,
;2015, 43(9): 1083-1091.
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To investigate the catalytic performance of nickel-based catalysts for carbon dioxide reforming of methane, four samples, SCM, IMP, T310 and HTP, with same contents of Ni were prepared by solution combustion method, incipient-wetness impregnation method, colloid mill circulating impregnation method and hydrothermal-precipitation method. The catalytic performance was tested at 800 ℃. The samples were characterized with ICP-AES, N2 absorption-desorption method, XRD, H2-TPR and TEM techniques. It was shown that the preparation methods had significant effects on the catalytic performance. The HTP and T310 samples had larger specific surface area, 190.83 m2/g and 182.21 m2/g respectively, which could provide more active sites and improve the activity (the initial conversion of CH4 and CO2 of HTP was up to 85.15% and 90.84%). The reduction peak area of NiAl2O4 of the catalysts prepared by solution combustion method and incipient-wetness impregnation method was higher than 90% of the total reduction area, indicating that these catalysts had more small Ni size particles and better stability after reduction (the conversion of CH4 for SCM and IMP was higher than that of HTP and T310 after 50 h experiment, and was up to 50% after 100 h reaction). Hence, the mojor reason for improving the activity and stability of catalyst would be the size of Ni particles and its resistance to sintering.
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