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 Fe 2 O 3 , 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 Fe 2 O 3 oxygen carriers and sintered in air at 1100C is a suitable preparation parameter to demonstrate reasonable oxygen conversion. The reduction mechanism of supported Fe 2 O 3 oxygen carriers were proposed in accordance with TGA and x-ray diffraction analysis (XRD) characterizations. Fe 2 TiO 5 and inherent TiO 2 as supporting material would be formed and carried on FBR in practical operation. The preparation of FT-03 (80% Fe 2 O 3 and 20% TiO 2 ) oxygen carrier demonstrated high CO 2 yields regarding to syngas (10% H 2 and 10% CO in N 2 ) and methane (10% CH 4 in N 2 ) combustion in FBR, operated at temperatures higher than 500 and 900C, respectively. Moreover, great mechanical strength and reasonable reactivity of supported Fe 2 O 3 oxygen carriers were also examined by texture analyzer with well-suited for used in CLC.