燃料化学学报Issue(5)：519-529,11.
东胜长焰煤热解含氧官能团结构演化的13 C-NMR和FT-IR分析
Structure evolution of oxygen functional groups in Dongsheng long flame coal by 13 C-NMR and FT-IR
摘要
Abstract
Vitrinite was separated and enriched from the 2 nd long flame coal seam in Dongsheng coal mine by flotation and centrifugation. Structural parameters of groups were obtained from proximate and ultimate analysis, as well as 13 C-NMR and FT-IR spectrum. The contents of carboxyl and carbonyl in the vitrain are from 8. 91 to 10. 90 mol/kg and from 1. 61 to 1. 79 mol/kg, respectively. Carboxyl is lost rapidly with increasing pyrolysis temperature. Methyl and methylene groups attached in the form of end groups to oxygen in the aliphatic chain or an aliphatic ring structure are removed first, and is basically stable above 350℃. The variation in occurrence of oxygen functional groups is the result of competition between aromatic and aliphatic system. Aromatic and aliphatic oxygen in coal pyrolyzed at 510 ℃ are 7. 49 and 3. 45 mol/kg. The evolution of hydroxyl is closely associated with the occurrence of oxygen. The content of various hydroxyls reduced along with the increasing temperature. Destructive effect on macromolecular network caused by pyrolysis interferes various hydrogen bonds, while the hydroxyl-π effect is enhance. The chemical activity order of oxygen in the coal is [ COOH] >[ R-O] > [ Ar-O-Ar, Ar-O-C, C-O-C] > [ C=O] . The contents of inactive and active ether in the vitrain are 0. 68 and 0. 48 mol/kg, respectively.关键词
东胜长焰煤/热解/含氧官能团/结构演化/13C-NMR/FT-IRKey words
Dongsheng long flame coal/pyrolysis/oxygen functional groups/structure evolution/13 C-NMR/FT-IR分类
化学工程引用本文复制引用
宋昱,朱炎铭,李伍..东胜长焰煤热解含氧官能团结构演化的13 C-NMR和FT-IR分析[J].燃料化学学报,2015,(5):519-529,11.基金项目
国家自然科学基金(41072117,41472135)。 （41072117,41472135）
