Chemical structural features of pyridine extracts and residues of the Argonne Premium coals using solid-state C-13 NMR spectroscopy
| Autor: | Thomas H. Fletcher, S. Wood, R. J. Pugmire, Mark S. Solum, S. Bai, David M. Grant |
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| Rok vydání: | 1993 |
| Předmět: |
Residue (complex analysis)
Hydrogen Chemistry General Chemical Engineering Energy Engineering and Power Technology chemistry.chemical_element Aromaticity Nuclear magnetic resonance spectroscopy Carbon-13 NMR chemistry.chemical_compound Fuel Technology Covalent bond Pyridine Proton NMR Organic chemistry Nuclear chemistry |
| Zdroj: | Energy & Fuels. 7:734-742 |
| ISSN: | 1520-5029 0887-0624 |
| Popis: | Soxhlet extractions were performed on the eight Argonne Premium coals using pyridine purged with argon and followed by a novel washing procedure to remove the pyridine. Mass closure (extracts plus residues) on duplicate experiments accounted for 94-96 % of the original coal, repeatable to within 2 %. Chemical structural features determined from 13 C NMR analyses of the extracts and residues showed more attachments per aromatic cluster for the residues, indicating a greater degree of covalent bonding in the residue than in the extract. 1 H NMR analysis of the extracts showed a gradual increase in the hydrogen aromaticity with rank, along with a maximum in the percentage of α-hydrogen in the high-volatile bituminous coals |
| Databáze: | OpenAIRE |
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