Determination of O-containing functional groups distribution in low-rank coals by chemical titration
Distribution of oxygen-functional groups (carboxyl, alcohol-hydroxyl, phenol-hydroxyl, methoxyl and carbonyl) in 4 Chinese low-rank coals was evaluated based on chemical analysis. Concentration of carboxyl was quantitated by acetic acid calcium ion exchange method and the buffer (pH=8.3). The effect...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Published: |
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/55429 |
| _version_ | 1848759618728099840 |
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| author | Zhou, J. Wang, Y. Huang, X. Zhang, Shu Lin, X. |
| author_facet | Zhou, J. Wang, Y. Huang, X. Zhang, Shu Lin, X. |
| author_sort | Zhou, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Distribution of oxygen-functional groups (carboxyl, alcohol-hydroxyl, phenol-hydroxyl, methoxyl and carbonyl) in 4 Chinese low-rank coals was evaluated based on chemical analysis. Concentration of carboxyl was quantitated by acetic acid calcium ion exchange method and the buffer (pH=8.3). The effect of analysis condition on the concentration of carboxyl and total acidity was studied. The results show that the reliable results are obtained in N 2 atmosphere other than in air. The occurrence of carboxyl in coal is carboxylate. When quantitating the concentration of phenol-hydroxyl in the acid-washing brown coal with ion exchanged method, its concentration increases with increasing pH value. Concentration of carboxyl and hydroxyl account for 34.49% and 34.79%, respectively, in the total oxygen for the dry ash free basis brown coal. Different concentrations of carbonyl exist in the low-rank coals, but that of methoxyl is little. |
| first_indexed | 2025-11-14T10:02:45Z |
| format | Journal Article |
| id | curtin-20.500.11937-55429 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:02:45Z |
| publishDate | 2013 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-554292017-08-24T02:18:47Z Determination of O-containing functional groups distribution in low-rank coals by chemical titration Zhou, J. Wang, Y. Huang, X. Zhang, Shu Lin, X. Distribution of oxygen-functional groups (carboxyl, alcohol-hydroxyl, phenol-hydroxyl, methoxyl and carbonyl) in 4 Chinese low-rank coals was evaluated based on chemical analysis. Concentration of carboxyl was quantitated by acetic acid calcium ion exchange method and the buffer (pH=8.3). The effect of analysis condition on the concentration of carboxyl and total acidity was studied. The results show that the reliable results are obtained in N 2 atmosphere other than in air. The occurrence of carboxyl in coal is carboxylate. When quantitating the concentration of phenol-hydroxyl in the acid-washing brown coal with ion exchanged method, its concentration increases with increasing pH value. Concentration of carboxyl and hydroxyl account for 34.49% and 34.79%, respectively, in the total oxygen for the dry ash free basis brown coal. Different concentrations of carbonyl exist in the low-rank coals, but that of methoxyl is little. 2013 Journal Article http://hdl.handle.net/20.500.11937/55429 restricted |
| spellingShingle | Zhou, J. Wang, Y. Huang, X. Zhang, Shu Lin, X. Determination of O-containing functional groups distribution in low-rank coals by chemical titration |
| title | Determination of O-containing functional groups distribution in low-rank coals by chemical titration |
| title_full | Determination of O-containing functional groups distribution in low-rank coals by chemical titration |
| title_fullStr | Determination of O-containing functional groups distribution in low-rank coals by chemical titration |
| title_full_unstemmed | Determination of O-containing functional groups distribution in low-rank coals by chemical titration |
| title_short | Determination of O-containing functional groups distribution in low-rank coals by chemical titration |
| title_sort | determination of o-containing functional groups distribution in low-rank coals by chemical titration |
| url | http://hdl.handle.net/20.500.11937/55429 |