Abstract
Fe2O3 is an excellent active metal oxide for chemical looping hydrogen generation (CLHG) with high conversion of CO to CO2 in the reduction stage, and high H2 mole fractions in the subsequent steam oxidation stage, especially for its low cost and abundance in nature. However, supports are generally used to improve its reactivity and stability and to eliminate its carbon deposition. In this paper, Fe-based oxygen carriers are prepared by a coprecipitation method with three supports, i.e., CeO2, ZrO2, and Al2O3. The reactivity, carbon deposition, redox stability, and sintering characteristics of the oxygen carriers are analyzed to investigate the effects of supports as well as the fundamental mechanism. The results show that the properties of the oxygen carriers highly rely on the support and its interaction with iron oxide. The oxygen carrier supported on Al2O3 exhibits poor reactivity and stability, and the oxygen carrier supported on ZrO2 leads to much carbon deposition, decreasing H2 purity, despite its...
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