Mechanism of decomposition of aromatics over charcoal and necessary condition for maintaining its activity
Decomposition of mono- to tetra-aromatics over charcoal was investigated under conditions such as temperature; 700–900 °C, inlet concentrations of aromatics, steam and H2; 7.5–15 g/Nm3, 0–15.5 vol% and 0–15.5 vol%, respectively, gas residence time within charcoal bed; 0.2 s, particle size of charcoa...
| 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/20.500.11937/26264 |
| _version_ | 1848751936990347264 |
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| author | Hosokai, S. Kumabe, K. Ohshita, M. Norinaga, K. Li, Chun-Zhu Hayashi, J. |
| author_facet | Hosokai, S. Kumabe, K. Ohshita, M. Norinaga, K. Li, Chun-Zhu Hayashi, J. |
| author_sort | Hosokai, S. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Decomposition of mono- to tetra-aromatics over charcoal was investigated under conditions such as temperature; 700–900 °C, inlet concentrations of aromatics, steam and H2; 7.5–15 g/Nm3, 0–15.5 vol% and 0–15.5 vol%, respectively, gas residence time within charcoal bed; 0.2 s, particle size of charcoal; 1.3–2.4 mm. The charcoal, with an initial surface area of 740 m2/g, was active enough to decompose naphthalene completely even at 750 °C. Aromatics with more rings per molecule were decomposed more rapidly. The aromatics were decomposed over the charcoal by coking rather than direct steam reforming irrespective of temperature and steam/H2 concentrations. The coking, i.e., carbon deposition from the aromatics, caused loss of micropores and thereby activity of the charcoal, while steam gasification of the charcoal/coke formed or regenerated micropores. Relationship between the overall rate of carbon deposition by the coking and gas formation by the gasification within the charcoal bed showed that progress of the gasification at a rate equivalent with or greater than that of the carbon deposition was necessary for maintaining the activity of the charcoal. |
| first_indexed | 2025-11-14T08:00:39Z |
| format | Journal Article |
| id | curtin-20.500.11937-26264 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:00:39Z |
| publishDate | 2008 |
| publisher | Elsevier Science Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-262642017-09-13T15:26:50Z Mechanism of decomposition of aromatics over charcoal and necessary condition for maintaining its activity Hosokai, S. Kumabe, K. Ohshita, M. Norinaga, K. Li, Chun-Zhu Hayashi, J. Charcoal Tar elimination Biomass gasification Decomposition of mono- to tetra-aromatics over charcoal was investigated under conditions such as temperature; 700–900 °C, inlet concentrations of aromatics, steam and H2; 7.5–15 g/Nm3, 0–15.5 vol% and 0–15.5 vol%, respectively, gas residence time within charcoal bed; 0.2 s, particle size of charcoal; 1.3–2.4 mm. The charcoal, with an initial surface area of 740 m2/g, was active enough to decompose naphthalene completely even at 750 °C. Aromatics with more rings per molecule were decomposed more rapidly. The aromatics were decomposed over the charcoal by coking rather than direct steam reforming irrespective of temperature and steam/H2 concentrations. The coking, i.e., carbon deposition from the aromatics, caused loss of micropores and thereby activity of the charcoal, while steam gasification of the charcoal/coke formed or regenerated micropores. Relationship between the overall rate of carbon deposition by the coking and gas formation by the gasification within the charcoal bed showed that progress of the gasification at a rate equivalent with or greater than that of the carbon deposition was necessary for maintaining the activity of the charcoal. 2008 Journal Article http://hdl.handle.net/20.500.11937/26264 10.1016/j.fuel.2008.04.019 Elsevier Science Ltd restricted |
| spellingShingle | Charcoal Tar elimination Biomass gasification Hosokai, S. Kumabe, K. Ohshita, M. Norinaga, K. Li, Chun-Zhu Hayashi, J. Mechanism of decomposition of aromatics over charcoal and necessary condition for maintaining its activity |
| title | Mechanism of decomposition of aromatics over charcoal and necessary condition for maintaining its activity |
| title_full | Mechanism of decomposition of aromatics over charcoal and necessary condition for maintaining its activity |
| title_fullStr | Mechanism of decomposition of aromatics over charcoal and necessary condition for maintaining its activity |
| title_full_unstemmed | Mechanism of decomposition of aromatics over charcoal and necessary condition for maintaining its activity |
| title_short | Mechanism of decomposition of aromatics over charcoal and necessary condition for maintaining its activity |
| title_sort | mechanism of decomposition of aromatics over charcoal and necessary condition for maintaining its activity |
| topic | Charcoal Tar elimination Biomass gasification |
| url | http://hdl.handle.net/20.500.11937/26264 |