The hydrogenation of carbon dioxide over Fe-Zn-M/HY (M=Cr, Al) composite catalysts at 340 ℃, 5.0 MPa was studied. Effects of Fe content of Fe-Zn-M catalysts on the conversion of carbon dioxide, the selectivity of hydrocarbon products were investigated. The adsorption performance of carbon dioxide and the reductive performance of Fe-Zn-M (M=Cr, Al) catalysts were studied by means of carbon dioxide Temperature-Programmed-Desorption (TPD) and H2 Temperature-Programmed-Reduction (TPR). The results indicated that the activity of the composite catalysts was improved with the increase of Fe content of Fe-Zn-M catalysts while the selectivity to hydrocarbons was decreased. Furthermore, the fraction of iso-alkanes in hydrocarbons produce decreased with the increase of the Fe content. CO2-TPD and H2-TPR study showed that the higher Fe content could result in more adsorption of carbon dioxide and easier reduction of the catalysts.
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