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Performance and kinetics of iron-based oxygen carriers reduced by carbon monoxide for chemical looping combustion
Abstract Chemical looping combustion is a promising technology for energy conversion due to its low-carbon, high-efficiency, and environmental-friendly feature. Avital 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 $ Fe_{2} $$ O_{3} $ and $ Fe_{2} $$ O_{3} $ supported by alumina ($ Fe_{2} $$ O_{3} $/$ Al_{2} $$ O_{3} $) were investigated using thermo-gravimetric analysis. $ Fe_{2} $$ O_{3} $/$ Al_{2} $$ O_{3} $ showed better reactivity over bare $ Fe_{2} $$ O_{3} $ toward CO reduction. This was well supported by the observed higher rate constant for $ Fe_{2} $$ O_{3} $/$ Al_{2} $$ O_{3} $ over pure $ Fe_{2} $$ O_{3} $ 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 $ Fe_{2} $$ O_{3} $ and $ Fe_{2} $$ O_{3} $/$ Al_{2} $$ O_{3} $. The boosting recital of iron-based oxygen carrier support toward efficient chemical looping combustion could be explained accurately through the present study.
Performance and kinetics of iron-based oxygen carriers reduced by carbon monoxide for chemical looping combustion
Abstract Chemical looping combustion is a promising technology for energy conversion due to its low-carbon, high-efficiency, and environmental-friendly feature. Avital issue for CLC process is the development of oxygen carrier, since it must have sufficient reactivity. The mechanism and kinetics of CO reduction on iron-based oxygen carriers namely pure $ Fe_{2} $$ O_{3} $ and $ Fe_{2} $$ O_{3} $ supported by alumina ($ Fe_{2} $$ O_{3} $/$ Al_{2} $$ O_{3} $) were investigated using thermo-gravimetric analysis. $ Fe_{2} $$ O_{3} $/$ Al_{2} $$ O_{3} $ showed better reactivity over bare $ Fe_{2} $$ O_{3} $ toward CO reduction. This was well supported by the observed higher rate constant for $ Fe_{2} $$ O_{3} $/$ Al_{2} $$ O_{3} $ over pure $ Fe_{2} $$ O_{3} $ with respective activation energy of 41.1±2.0 and 33.3±0.8 kJ∙$ mol^{–1} $. The proposed models were compared via statistical approach comprising Akaike information criterion with correction coupled with F-test. The phase-boundary reaction and diffusion control models approximated to 95% confidence level along with scanning electron microscopy results; revealed the promising reduction reactions of pure $ Fe_{2} $$ O_{3} $ and $ Fe_{2} $$ O_{3} $/$ Al_{2} $$ O_{3} $. The boosting recital of iron-based oxygen carrier support toward efficient chemical looping combustion could be explained accurately through the present study.
Performance and kinetics of iron-based oxygen carriers reduced by carbon monoxide for chemical looping combustion
Hua, Xiuning (author) / Wang, Wei (author) / Wang, Feng (author)
2015
Article (Journal)
English
Chemical looping gasification of lignin with bimetallic oxygen carriers
| Elsevier | 2019