Investigation Of Chemical Looping Combustion Performance Between Fe₂O₃（104） Composite And Carbon Monoxide Under The Synergy Of Carrier

Oxygen carrier acts as one of the key factors for chemical-looping combustion (CLC). The properties of oxygen carrier decide the performance efficiency of CLC. In this work, Fe-based oxygen carriers are selected due to its low cost and environmental compatibility, which were obtained by supporting Fe2O3(104) on various carriers, including Al2O3, TiO2, MgO, SiO2 and ZrO2 to improve the oxygen transport capacity and avioding agglomeration.Firstly, Fe-based oxygen carriers, whose mass fraction is 60%, were preparated by coprecipitation, Fe2O3(104)/Al2O3, Fe2O3(104)/SiO2, Fe2O3(104)/TiO2, Fe2O3(104)/MgO and Fe2O3(104)/ZrO2. The surface topography and constituent are modified by XRD, SEM and BET. The result shows, Fe2O3(104) are distributed at the surface of Al2O3, MgO, SiO2 and ZrO2 successfully, and crystal formation is steady. Besides, oxygen carriers have the quality of uniform size, cruded surface and well-developed porosity, and the BET area of is comparatively large.Secondly, Fe2O3(104) with different carriers(Al2O3, TiO2, MgO, SiO2,ZrO2) was studed in a thermogravimetric analyzer(TGA) and mini-experiment test, and the experiment treat CO as the fuel. For Fe-based oxygen carriers with different support materials (mass fraction of Fe2O3 is 60%), the support can improve the performance of the reaction between CO and carriers, Al2O3 proved to be the best inert for Fe-based oxygen carriers, but Fe2O3 oxide showed the bad behavior on TiO2, SiO2. The temperature have great effect on the the activity of Fe-based oxygen carrier. The activity improves as temperature rose. Fe-based oxide is a dimensional model, reaction activation energy of 161.387J·mol-1. And experimental values has a great correlation with calculated values.Finally, in order to investigate the carbon deposition, the experiment between CO and Fe2O3(104) carrier are betested in different temperature and time. Campare to other inerts(Al2O3, MgO, SiO2, ZrO2), TiO2 proved to be the best inert for Fe2O3(104) at anti-carbon depositon ability. But Fe2O3(104)/SiO2 and Fe2O3(104)/MgO have much more serious carbon deposition. The carbon deposits vary with reaction temperature. When the reaction temperature is 800℃, TiO2 is proved to be the best inert for oxygen carriers; When the reaction temperature is 900℃, Fe2O3(104)/TiO2, Fe2O3(104)/Al2O3 show the better anti-carbon depositon ability.