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The Catalytic performances for methane steam reforming reaction ofNi/Al_2O_3(commercial), Ni/Al_2O_3 (developed surface )and Ni/Al_2O_3-R_xO_y (R israre earth oxide) Catalysts were investigated by means of X-ray diffraction,TG, SEM/ X-ray analysis, pulse gas chromatography,BET and Mercuryporsiniter techniques. The distribution of rear earth oxides on the supports,themetal-support (additives) interaction and the influence of rare earth oxideadditives on the dispersion of active components,catulytic activities,variationof nickel crystallites size,CO chemisorption,formation of NiAl_2O_4 as well asthe reducibility of the catalysts were examined.The presence of rare earthoxides in the Ni/Al_2O_3 (developed surface) results in great improvement ofstubility through suppressing the growth of Ni crystallites,the oxidation of themetallic Ni and the formation of NiAl_2O_4. The effect of heavy rare earth oxidesis more distinct than that of the light ones.Strong metal support interaction(SMSI) exists in Ni/Al_2O_3- R
The Catalytic performances for methane steam reforming reaction of Ni / Al_2O_3 commercialized, Ni / Al_2O_3 developed surface and Ni / Al_2O_3-R_xO_y (R israre earth oxide) Catalysts were investigated by means of X-ray diffraction, TG, SEM / X -ray analysis, pulse gas chromatography, BET and Mercuryporsiniter techniques. The distribution of rear earth oxides on the supports, themetal-support (additives) interaction and the influence of rare earth oxideadditives on the dispersion of active components, catulytic activities, variation of nickel crystallites size, CO chemisorption, formation of NiAl 2 O 4 as well asthe reducibility of the catalysts were. The presence of rare earthoxides in the Ni / Al 2 O 3 (developed surface) results in great improvement of stubility through suppressing the growth of Ni crystallites, the oxidation of themetallic Ni and the formation of NiAl_2O_4. The effect of heavy rare earth oxidesis more distinct than that of the light ones. Strong metal support interaction (SMSI) exis ts in Ni / Al_2O_3- R