Feasibility Study of Fe-ti based Oxygen Carriers for Chemical Looping Combustion

Abstract

The reactivity and high fuel conversion efficiency of metal oxide as oxygen carrier are two of the most important functions that can be research in order to make chemical looping combustion (CLC) a reality. In this study, oxygen carriers of Fe2O3, supported by titanium oxides were prepared to evaluate the feasibility as oxygen carriers for chemical looping by thermogravimetric analyzer (TGA), as well as gas conversion in a fixed bed reactor (FBR). Supported Fe2O3 oxygen carriers and sintered in air at 1100̊C is a suitable preparation parameter to demonstrate reasonable oxygen conversion. The reduction mechanism of supported Fe2O3 oxygen carriers were proposed in accordance with TGA and x-ray diffraction analysis (XRD) characterizations. Fe2TiO5 and inherent TiO2 as supporting material would be formed and carried on FBR in practical operation. The preparation of FT-03 (80% Fe2O3 and 20% TiO2) oxygen carrier demonstrated high CO2 yields regarding to syngas (10% H2 and 10% CO in N2) and methane (10% CH4 in N2) combustion in FBR, operated at temperatures higher than 500 and 900̊C, respectively. Moreover, great mechanical strength and reasonable reactivity of supported Fe2O3 oxygen carriers were also examined by texture analyzer with well-suited for used in CLC.