The present studies have been investigated to suppress the carbon deposition by various promoters (La, Ce, Mg) over Ni-based catalysts in steam-CO2 reforming of methane. Ni-X-Y/γ-Al2O3 (X = 10 wt% La, Y = 6 wt% Mg, Ce) catalysts were prepared by co-impregnation method. The catalytic reactions were tested at 800~900 ℃ and 20 bar in the composition of CH4:CO2:H2O:Ar = 1:0.8:1.3:1 and GHSV = 15,000~25,000 h-1. The prepared catalysts were characterized by BET surface area, X-ray diffraction (XRD), H2-Temperature programmed reduction (TPR), CO2-Temperature programmed desorption (TPD) and TEM image. The carbon deposition amount and type in used catalysts were examined by TGA analysis and FE-SEM/EDX image. Ni-La-Z/γ-Al2O3 catalysts were tested at 800 ℃ and 20 bar in order to investigate the effect on carbon deposition. As a result, those catalysts showed decrease of the carbon deposition than the Ni catalyst. The Ni-La-Mg catalyst showed highest activity and higher carbon resistance than other catalysts. It was suggested that the Ni-La-Mg catalyst had the lowest Ni particle size and formed relatively stable MgAl2O4, which has an effect on the catalytic performance. Additionally, the study of kinetics was carried out with variations of each feed gases partial pressure and reaction temperature with keeping the other condition constant.

Carbon depositions and kinetic study over Ni-based catalysts in steam-CO2 reforming of methane

249th National Meeting (2015)

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