Enhanced Production of C5+Hydrocarbons from CO2 Hydrogenation by the Synergistic Effects of Pd and K on -Fe2O3 Catalyst

Pure -Fe2O3 was prepared by two steps. L(+)-Tartaric acid and Fe(NO3)(3)9H(2)O were sequentially dissolved into water, then the stick liquid was dried and calcined in air. Promoter Pd and K were added to Fe2O3 by impregnation. The influence of Pd or K on Fe2O3 was different in view of the reducibility of Fe2O3, H-2 and CO2 adsorption. But synergistic effects were observed from the catalyst co-promoted by Pd and K (Catalyst PKF). The improving effect of Pd on Fe2O3 reduction was further stimulated by K, and the CO2 quantity desorbed from catalyst PKF at the temperature lower than 300 degrees C was increased. The synergistic effects resulted in PKF having the highest C(5+)selectivity for CO2 hydrogenation at 235 degrees C among the studied catalysts.