The activity and products distribution of CO2 hydrogenation reaction on the iron-based catalysts were shown in Fig. . Varied transition metal promoters, i.e. Zn, Cu and Mn, were investigated for iron-based catalysts in CO2 hydrogenation reaction (Fig. ). The CO2 conversion and light olefin (C2-C4 = ) selectivity over the Fe120K10 catalyst were 35.3% and 41.0% respectively. The incorporation of the transition metal Zn resulted in an increase of CO2 conversion from 35.3% to 41.2%, meanwhile the selectivity of the by-product CO decreased from 22.9% to 16.6%, with essentially no effect on the distribution of the hydrocarbon products.