关键词: O2 , Carbon dioxide (CO2) , Methane , Ni/α-Al2O3 catalysts , combined reaction , O2, Carbon dioxide (CO2), Methane, Ni/α-Al2O3 catalysts, combined reaction

Abstract: Ni/?Al2O3 catalysts were found to be active in the temperature range 600-900oC for both CO2 reforming and partial oxidation of methane. The effects of Ni loading, reaction temperature and feed gas ratio for combination of CO2 reforming and partial oxidation of CH4 over Ni/?Al2O3 were investigated. x wt.% Ni/?Al2O3 (x= 2.5, 5, 8 and 12) catalysts were prepared by wet impregnation of the calcined support with a solution of nickel nitrate. The obtained results showed that the 5% wt Ni/?Al2O3 was the most active catalyst compared with the other catalysts, because an increase in Ni loading more than 5% wt. led to reduction in Ni dispersion. In case of partial oxidation, CH4 conversion dropped from 99 % for 5%wt Ni to 94% for 12%wt Ni loaded catalyst. By adding more Ni to 5%wt Ni catalyst up to 12%wt, the trend was the same for dry reforming as methane conversion decreased 40%. In addition, by combining the endothermic carbon dioxide reforming reaction with the exothermic partial oxidation reaction, the loss of activity of the catalyst with time on stream with the amount of oxygen added to the feed was negligible.