Preparation And Characterization Of Fe-Base Catalyst For Reverse-Water-Gas-Shift Reaction

Recycle of CO₂ is urgent because of its emission threaten environment fearfully. Reverse Water Gas Shift Reaction(RWGS) is one of the most important approach in the reusing of CO₂. Co-precipitation was used to prepare iron manganeses mixed oxides for the RWGS. The catalysts samples were studied by Micro-reactor,XRD,TPR,BET and TEM. The emphasis is to optimize composite and structure of the catalysts with robust activity and thermostability.The activity of catalyst prepared by Fe²⁺ and Fe³⁺ starting materials is superior to that of catalyst prepared by individual Fe²⁺ or Fe³⁺. Manganese dopant into the iron oxides enhances its activity and thermostability. Fe/Mn based catalyst present higher activity and thermostability than that of Cu/Mn,Zn/Mn based catalyst.. The optimization composition is Fe²⁺/Fe³⁺/Mn=42:16:42.Additives rare earths can further improve activity and thermostability no matter Fe or Fe/Mn catalysts. Co adulterant of CeO2 and La2O3 can promote the activity and thermostability of manganeses mixed oxides for the reverse water gas shift reaction.