Performance and kinetics of iron-based oxygen carriers reduced by carbon monoxide for chemical looping combustion

Xiuning HUA , Wei WANG , Feng WANG

Front. Environ. Sci. Eng. ›› 2015, Vol. 9 ›› Issue (6) : 1130 -1138.

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Front. Environ. Sci. Eng. ›› 2015, Vol. 9 ›› Issue (6) : 1130 -1138. DOI: 10.1007/s11783-015-0821-y
RESEARCH ARTICLE
RESEARCH ARTICLE

Performance and kinetics of iron-based oxygen carriers reduced by carbon monoxide for chemical looping combustion

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Abstract

Chemical looping combustion is a promising technology for energy conversion due to its low-carbon, high-efficiency, and environmental-friendly feature. A vital issue for CLC process is the development of oxygen carrier, since it must have sufficient reactivity. The mechanism and kinetics of CO reduction on iron-based oxygen carriers namely pure Fe2O3 and Fe2O3 supported by alumina (Fe2O3/Al2O3) were investigated using thermo-gravimetric analysis. Fe2O3/Al2O3 showed better reactivity over bare Fe2O3 toward CO reduction. This was well supported by the observed higher rate constant for Fe2O3/Al2O3 over pure Fe2O3 with respective activation energy of 41.1±2.0 and 33.3±0.8 kJ·mol−1. The proposed models were compared via statistical approach comprising Akaike information criterion with correction coupled with F-test. The phase-boundary reaction and diffusion control models approximated to 95% confidence level along with scanning electron microscopy results; revealed the promising reduction reactions of pure Fe2O3 and Fe2O3/Al2O3. The boosting recital of iron-based oxygen carrier support toward efficient chemical looping combustion could be explained accurately through the present study.

Keywords

chemical looping combustion / iron-based oxygen carriers / reduction kinetics / carbon monoxide / statistics

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Xiuning HUA, Wei WANG, Feng WANG. Performance and kinetics of iron-based oxygen carriers reduced by carbon monoxide for chemical looping combustion. Front. Environ. Sci. Eng., 2015, 9(6): 1130-1138 DOI:10.1007/s11783-015-0821-y

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