Citation:
LI Qu, QIN Wu, ZHANG Jun-jiao, CHENG Wei-liang, DONG Chang-qing. Characteristics and kinetics of chemical looping combustion of Mn-doped Fe2O3 oxygen carrier with CO[J]. Journal of Fuel Chemistry and Technology,
;2014, 42(8): 932-937.
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Mn-doped Fe2O3 oxygen carriers with different molar ratios of Fe to Mn were prepared by co-precipitation method, which were characterized by XRD, BET and TEM. Chemical looping combustion tests between Mn-Fe2O3 and CO at different temperatures were performed to investigate the reaction characteristics, and to determine the optimized Mn doping amount and reaction temperature. The results reveal that a rational Mn doping could enhance the reactivity of iron-base oxygen carrier, and the optimal Fe/Mn molar ratio is 50. Multi-cycle experiments confirm the high stability of the optimized oxygen carrier. Furthermore, the reaction kinetic analysis at heating rates of 30, 40, 50 ℃/min shows that the Avrami-Erofeev model is suitable for the reactions, and the activation energy and pre-exponential factor can be calculated according to the kinetic model.
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Keywords:
- chemical looping combustion,
- Fe2O3 oxygen carrier,
- Mn,
- CO,
- CO2-capture
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