Drastic changes in biomass char structure and reactivity upon contact with steam
An Australian cane trash biomass was pyrolysed by heating at a slow heating rate to 700–900 °C in an inert gas atmosphere. The chars were then gasified in situ with steam. Our results indicate that the gasification of char with steam, even only for 20 s when the char conversion was minimal, resulted...
| Main Authors: | , , |
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| Format: | Journal Article |
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Elsevier Science Ltd
2008
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| Online Access: | http://hdl.handle.net/20.500.11937/22764 |
| _version_ | 1848750962122948608 |
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| author | Keown, D. Hayashi, J. Li, Chun-Zhu |
| author_facet | Keown, D. Hayashi, J. Li, Chun-Zhu |
| author_sort | Keown, D. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | An Australian cane trash biomass was pyrolysed by heating at a slow heating rate to 700–900 °C in an inert gas atmosphere. The chars were then gasified in situ with steam. Our results indicate that the gasification of char with steam, even only for 20 s when the char conversion was minimal, resulted in drastic reduction in the intrinsic reactivity of char with air at 400 °C. The decreases in the char reactivity were not mainly due to the possible volatilisation of inherent catalysts during gasification in steam. Instead, the FT-Raman spectroscopy of the chars showed that the gasification of char with steam resulted in drastic changes in char structure including the transformation of smaller ring systems (3–5 fused rings) to large ring systems (>6 fused rings). It is believed that the intermediates of char–steam reactions, especially H, penetrated deep into the char matrix to induce the ring condensation reactions. |
| first_indexed | 2025-11-14T07:45:09Z |
| format | Journal Article |
| id | curtin-20.500.11937-22764 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:45:09Z |
| publishDate | 2008 |
| publisher | Elsevier Science Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-227642017-09-13T13:56:22Z Drastic changes in biomass char structure and reactivity upon contact with steam Keown, D. Hayashi, J. Li, Chun-Zhu Char structure Raman Gasification Reactivity Biomass An Australian cane trash biomass was pyrolysed by heating at a slow heating rate to 700–900 °C in an inert gas atmosphere. The chars were then gasified in situ with steam. Our results indicate that the gasification of char with steam, even only for 20 s when the char conversion was minimal, resulted in drastic reduction in the intrinsic reactivity of char with air at 400 °C. The decreases in the char reactivity were not mainly due to the possible volatilisation of inherent catalysts during gasification in steam. Instead, the FT-Raman spectroscopy of the chars showed that the gasification of char with steam resulted in drastic changes in char structure including the transformation of smaller ring systems (3–5 fused rings) to large ring systems (>6 fused rings). It is believed that the intermediates of char–steam reactions, especially H, penetrated deep into the char matrix to induce the ring condensation reactions. 2008 Journal Article http://hdl.handle.net/20.500.11937/22764 10.1016/j.fuel.2007.05.057 Elsevier Science Ltd restricted |
| spellingShingle | Char structure Raman Gasification Reactivity Biomass Keown, D. Hayashi, J. Li, Chun-Zhu Drastic changes in biomass char structure and reactivity upon contact with steam |
| title | Drastic changes in biomass char structure and reactivity upon contact with steam |
| title_full | Drastic changes in biomass char structure and reactivity upon contact with steam |
| title_fullStr | Drastic changes in biomass char structure and reactivity upon contact with steam |
| title_full_unstemmed | Drastic changes in biomass char structure and reactivity upon contact with steam |
| title_short | Drastic changes in biomass char structure and reactivity upon contact with steam |
| title_sort | drastic changes in biomass char structure and reactivity upon contact with steam |
| topic | Char structure Raman Gasification Reactivity Biomass |
| url | http://hdl.handle.net/20.500.11937/22764 |