(706b) Evaluation of the Iron-Based Material with Al2O3/ZrO2 Addition As Oxygen Carrier Applied in Chemical Looping Process

Chemical looping process is one of the promising technologies for carbon capture. Oxygen carrier plays an important role in the chemical looping process. By the reaction of oxidation and reduction, iron could carry or release the oxygen by its phase change. In the present study, iron-based composite with alumina and zirconia addition were used for oxygen carriers in chemical looping. Material properties including relative density, microstructure, reactivity and mechanical ones were measured. Feasibility of this composite for chemical looping could therefore be evaluated.

The result indicated that all of the specimens formed a layer of Fe₂O₃ in the surface. Different ionic diffusion rate made this phase separation occurred. Moreover, the reactivity was then decreased. In the case of the addition of ZrO₂, an extra oxygen vacancy will produce due to the substitutional reaction between Zr and Fe. Although the specimen which only composited with ZrO₂ and Fe₂O₃ showed the best reactivity, the consuming of Fe₂O₃ might lead it not suitable to be the material for chemical looping.

Keywords: chemical looping, oxygen carrier, zirconia, microstructure, redox reaction