CHARACTERIZATION OF TIO2-SUPPORTED, ZRO2-SUPPORTED AND AL2O3-SUPPORTED IRON CATALYSTS AS USED FOR CO2 HYDROGENATION

Alumina-, titania- and zirconia-supported iron oxides with an Fe loadi ng of 5 wt.-% have been prepared by direct reduction of the precursors from incipient wetness impregnation and used for the synthesis of C-2 +-hydrocarbons from CO2 and H-2. According to the conversion of CO2, t he catalytic activity decreases in the following order: Fe/TiO2(B) sim ilar to Fe/ZrO2(B) > Fe/TiO2(A) > Fe/ZrO2(A) > Fe/Al2O3. XRD, Raman, M ossbauer and EXAFS analyses are employed for the characterization of t he catalysts following the reduction treatment. The results suggest th at conversion of CO2 to hydrocarbons is favored by the simultaneous pr esence of both zerovalent irons and coordinatively unsaturated cationi c irons, among which ferric ions are for the Fe/ZrO2(B) and ferrous io ns for the Fe/TiO2(B).