Kinetic compensation effects in the chemical reaction-controlled regime and mass transfer-controlled regime during the gasification of biochar in O2
© 2018 Elsevier B.V. This study aims to investigate the kinetic compensation effects during the char-O2reaction in a fluidised-bed reactor for two particle sizes of 0.80–1.0 mm and 2.0–3.35 mm. The rate of char-O2reaction was determined by analysing the gasification product gas composition in a quad...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
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Elsevier
2018
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| Online Access: | http://purl.org/au-research/grants/arc/DP180101788 http://hdl.handle.net/20.500.11937/71508 |
| _version_ | 1848762498585460736 |
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| author | Akhtar, M. Zhang, Shu Shao, X. Dang, H. Liu, Y. Li, T. Zhang, Lei Li, Chun-Zhu |
| author_facet | Akhtar, M. Zhang, Shu Shao, X. Dang, H. Liu, Y. Li, T. Zhang, Lei Li, Chun-Zhu |
| author_sort | Akhtar, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2018 Elsevier B.V. This study aims to investigate the kinetic compensation effects during the char-O2reaction in a fluidised-bed reactor for two particle sizes of 0.80–1.0 mm and 2.0–3.35 mm. The rate of char-O2reaction was determined by analysing the gasification product gas composition in a quadrupole mass spectrometer. The char-O2reaction exhibited different kinetic compensation effects between apparent activation energy and apparent pre-exponential factor in the kinetics-controlled, diffusion-controlled and mixed regimes for both particle sizes. The same reaction mechanism is followed during the char-O2reaction in the kinetic regime at same or at different pyrolysis temperatures as revealed by the kinetic compensation effects. In the mixed regime, higher diffusion limitations increased the m and c values in the kinetic compensation effect lnAapp= mEapp+ c for any given particle size. Due to higher rates of reaction at higher char conversions, the char-O2reaction switched from kinetics-controlled to mixed regimes, resulting in higher slopes ‘m’ and y-intercepts ‘c’ in the kinetic compensation effects. The absence of isokinetic temperature at higher conversions indicates that char properties changed significantly at higher conversions compared with those at lower conversions. |
| first_indexed | 2025-11-14T10:48:31Z |
| format | Journal Article |
| id | curtin-20.500.11937-71508 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:48:31Z |
| publishDate | 2018 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-715082022-10-27T07:32:08Z Kinetic compensation effects in the chemical reaction-controlled regime and mass transfer-controlled regime during the gasification of biochar in O2 Akhtar, M. Zhang, Shu Shao, X. Dang, H. Liu, Y. Li, T. Zhang, Lei Li, Chun-Zhu © 2018 Elsevier B.V. This study aims to investigate the kinetic compensation effects during the char-O2reaction in a fluidised-bed reactor for two particle sizes of 0.80–1.0 mm and 2.0–3.35 mm. The rate of char-O2reaction was determined by analysing the gasification product gas composition in a quadrupole mass spectrometer. The char-O2reaction exhibited different kinetic compensation effects between apparent activation energy and apparent pre-exponential factor in the kinetics-controlled, diffusion-controlled and mixed regimes for both particle sizes. The same reaction mechanism is followed during the char-O2reaction in the kinetic regime at same or at different pyrolysis temperatures as revealed by the kinetic compensation effects. In the mixed regime, higher diffusion limitations increased the m and c values in the kinetic compensation effect lnAapp= mEapp+ c for any given particle size. Due to higher rates of reaction at higher char conversions, the char-O2reaction switched from kinetics-controlled to mixed regimes, resulting in higher slopes ‘m’ and y-intercepts ‘c’ in the kinetic compensation effects. The absence of isokinetic temperature at higher conversions indicates that char properties changed significantly at higher conversions compared with those at lower conversions. 2018 Journal Article http://hdl.handle.net/20.500.11937/71508 10.1016/j.fuproc.2018.09.009 http://purl.org/au-research/grants/arc/DP180101788 Elsevier restricted |
| spellingShingle | Akhtar, M. Zhang, Shu Shao, X. Dang, H. Liu, Y. Li, T. Zhang, Lei Li, Chun-Zhu Kinetic compensation effects in the chemical reaction-controlled regime and mass transfer-controlled regime during the gasification of biochar in O2 |
| title | Kinetic compensation effects in the chemical reaction-controlled regime and mass transfer-controlled regime during the gasification of biochar in O2 |
| title_full | Kinetic compensation effects in the chemical reaction-controlled regime and mass transfer-controlled regime during the gasification of biochar in O2 |
| title_fullStr | Kinetic compensation effects in the chemical reaction-controlled regime and mass transfer-controlled regime during the gasification of biochar in O2 |
| title_full_unstemmed | Kinetic compensation effects in the chemical reaction-controlled regime and mass transfer-controlled regime during the gasification of biochar in O2 |
| title_short | Kinetic compensation effects in the chemical reaction-controlled regime and mass transfer-controlled regime during the gasification of biochar in O2 |
| title_sort | kinetic compensation effects in the chemical reaction-controlled regime and mass transfer-controlled regime during the gasification of biochar in o2 |
| url | http://purl.org/au-research/grants/arc/DP180101788 http://hdl.handle.net/20.500.11937/71508 |