东胜长焰煤热解含氧官能团结构演化的<sup>13</sup>C-NMR和FT-IR分析

宋昱; 朱炎铭; 李伍

东胜长焰煤热解含氧官能团结构演化的¹³C-NMR和FT-IR分析

宋昱^1,2,
朱炎铭^1,2,,
李伍^1,2

1.
中国矿业大学资源与地球科学学院, 江苏徐州 221116;
2.
中国矿业大学煤层气资源与成藏过程教育部重点实验室, 江苏徐州 221008

基金项目: 国家自然科学基金(41072117, 41472135)。

详细信息

通讯作者:
朱炎铭(1963-), 教授, 从事煤、油气资源评价、页岩气资源勘探、能源沉积盆地分析等方面的研究。 Email: yanmingzhu@sohu.com。

中图分类号: TQ530.2
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出版历程
- 收稿日期: 2014-10-22
- 刊出日期: 2015-05-30

Structure evolution of oxygen functional groups in Dongsheng long flame coal by ¹³C-NMR and FT-IR

SONG Yu^1,2,
ZHU Yan-ming^{1,2
,},
LI Wu^1,2

1.
School of Resources and Earth Science, China University of Mining & Technology, Xuzhou 221116, China;
2.
Key Laboratory of Coalbed Methane Resource & Reservoir Formation Process, Ministry of Education, Xuzhou 221008, China

摘要

摘要: 以东胜煤田色拉一号井田2号煤层长焰煤为研究对象,利用浮沉离心法富集其镜质组。基于工业分析、元素分析、¹³C-NMR、FT-IR、谱图分峰拟合技术和化学分析测试,求取镜煤及一系列热解煤含氧官能团结构与含量参数,从不同角度研究了含氧官能团的分布规律与演化特点。镜煤中羧基、羰基含量分别为8.91~10.90 mol/kg、1.61~1.79 mol/kg,随热解温度升高羧基显著减少。热解作用促使以端基形式连接在脂肪链或脂肪环结构氧上的甲基和亚甲基首先脱去,且在温度高于350 ℃后基本稳定。氧在热解过程赋存状态的变化是芳香体系与脂肪体系相互竞争的结果,510 ℃热解煤中芳香类氧和脂肪类氧的含量分别为7.49、3.45 mol/kg。羟基的演化过程与热解过程中氧的赋存状态密切相关。随着热解过程的进行,在热解温度低于440 ℃时,各种羟基含量均减少,热解过程对于大分子网络的破坏干扰了各种氢键作用,而羟基π作用则暂时增强,至510 ℃时各种氢键含量均降为最低。东胜长焰煤中含氧官能团化学活性顺序为:[COOH]>[R-O]>[Ar-O-Ar,Ar-O-C,C-O-C]>[C=O]。镜煤非活性醚键含量为0.68 mol/kg,活性醚键为0.48 mol/kg,主要为非活性醚键。
- 东胜长焰煤 /
- 热解 /
- 含氧官能团 /
- 结构演化 /
- ¹³C-NMR /
- FT-IR
Abstract: Vitrinite was separated and enriched from the 2nd 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 ¹³C-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.
- Dongsheng long flame coal /
- pyrolysis /
- oxygen functional groups /
- structure evolution /
- ¹³C-NMR /
- FT-IR

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东胜长焰煤热解含氧官能团结构演化的¹³C-NMR和FT-IR分析

通讯作者:
朱炎铭(1963-), 教授, 从事煤、油气资源评价、页岩气资源勘探、能源沉积盆地分析等方面的研究。 Email: yanmingzhu@sohu.com。

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Structure evolution of oxygen functional groups in Dongsheng long flame coal by ¹³C-NMR and FT-IR

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2023年《燃料化学学报（中英文）》评优结果公布！

留言板

东胜长焰煤热解含氧官能团结构演化的13C-NMR和FT-IR分析

通讯作者: 朱炎铭(1963-), 教授, 从事煤、油气资源评价、页岩气资源勘探、能源沉积盆地分析等方面的研究。 Email: yanmingzhu@sohu.com。

计量

出版历程

Structure evolution of oxygen functional groups in Dongsheng long flame coal by 13C-NMR and FT-IR

计量

出版历程

目录

2023年《燃料化学学报（中英文）》评优结果公布！

东胜长焰煤热解含氧官能团结构演化的¹³C-NMR和FT-IR分析

通讯作者:
朱炎铭(1963-), 教授, 从事煤、油气资源评价、页岩气资源勘探、能源沉积盆地分析等方面的研究。 Email: yanmingzhu@sohu.com。

Structure evolution of oxygen functional groups in Dongsheng long flame coal by ¹³C-NMR and FT-IR