Abstract
We selected Fe2O3 as the model oxygen carrier for chemical looping combustion(CLC) to theoretically detect the electronic properties of the high index surface(104) and the referenced low index surface(001). Fe2O3(104) exhibits better electronic structure for the interaction to lignite. Then,based on the theoretical calculations,Fe2O3(104) supported on Al2O3 was obtained via surface-controlled preparation. The reaction between lignite and the prepared Fe2O3(104) /Al2O3 is more efficient than the reaction between lignite and the reference Fe2O3/ Al2O3 prepared via traditional impregnation method,which corresponds to the theoretical calculations. Ultimate analysis shows less carbon deposit on the reduced Fe2O3(104) /Al2O3 than on the reduced Fe2O3/ Al2O3. Further,the fresh and the regenerated oxygen carrier were characterized,which verified the regeneration ability of Fe2O3(104) after severe structural relaxation during the reaction processes.These findings indicate that morphological control of oxygen carrier is very rewarding and will throw light to the next generation of highly efficient oxygen carriers for CLC technology.
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