Abstract
Aiming at the problems of low redox activity and easy sintering deactivation of hematite, Sr was used to modify hematite in chemical looping combustion (CLC). The results showed that a low concentration (1 wt%) of Sr dopant could significantly improve the redox activity and cyclic stability of hematite. During the successive redox cycles, the surface sintering was not occurred for the Sr-doped hematite samples, indicating that Sr could significantly intensify the sintering resistance of hematite in CLC. In the first redox cycle, the oxygen carrying capacity of the Sr-doped hematite samples followed the sequence: 10Sr-HM (3.32%) > 5Sr-HM (3.20%) > 1Sr-HM (2.11%). By comparing the redox performance of hematite samples doped with different SrO content, 5 wt% is the best addition ratio of SrO dopant. The results of successive 50 cycles indicated that the hematite sample doped with 5 wt% SrO exhibited very high cyclic stability. For the 5Sr-HM, the CH4 conversion and CO2 selectivity was about 90% and 100%, respectively. In addition, the effect of calcination temperature (950 °C, 1050 °C, 1150 °C) on the redox performance of Sr-doped hematite was also considered. The results indicated that the Sr-doped hematite presented high redox activity after high temperature calcination.
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