Effects of Nickel Precursor and Calcination Temperature on the Performance of Ni/MgAl2O4 Catalysts for Syngas Production by CO2 Reforming of Coke Oven Gas

The CO2 reforming of coke oven gas (COG) to product syngas at 750 degrees C over 10 wt% Ni loaded on spinel MgAl2O4 (10Ni/MA) catalyst supported different nickel precursors was researched, including nickel nitrate, nickel acetate, nickel chloride and nickel acetylacetonate. Moreover, the calcination temperature of catalysts was also studied to investigate the activity and stability. The catalysts were analyzed by XRD, BET, CO2-TPD, H-2-TPH and TEM. It was observed that MA (calcined at 800 degrees C) supported nickel nitrate has the largest surface area, the most uniform pore diameter and the ratio nickel species owned higher bounding strength with support was the best. In addition, the results showed that catalysts supported nickel nitrate demonstrated the highest catalytic activity in which the conversion of CH4 and CO2 were up to 81.4% and 94.5%, respectively, and the selectivity of H-2 and CO were 71.3% and 88.8%, respectively.