Study on CO_2 hydrogenation to light olefins over iron-based catalysts

Hydrogenation of carbon dioxide to light olefins over the supported Fe-Cu-K-Ce catalysts prepared by impregnation method was studied.The effects of supports,loading contents of Fe,Cu,K and Ce on the support,calcination temperature of the catalyst,and the reaction conditions of temperature,space velocity and pressure on the activity of the catalysts were examined.The results showed that the MgO-ZSM-5 supported Fe-Cu-K-Ce catalyst with 15% by mass Fe and the Fe/Cu/K/Ce molar ratio of 100:20: 8:8 and calcined in air at 773K exhibited the best catalytic activity under reaction temperature of 623K,pressure of 1.0MPa and GHSV of 1200h-1,with a CO2 conversion of over 60% and a selectivity to light olefins of over 20%.The catalysts were characterized by CO2-TPD,XRD and TEM.