摘要
以空化洗油为溶胀剂,对新疆准东煤田西沟煤样进行自然溶胀和微波溶胀处理.借助peakfit软件,对三种煤样的FTIR谱图进行分峰处理,定性和半定量分析比较了原煤样的分子结构特点,以及自然溶胀和微波溶胀对其分子结构中各官能团的作用.FTIR分峰结果为：1）三种煤样的红外谱均可大致分为四段,即3 600cm-1~3 100cm-1处羟基官能团、3 000cm-1~2 800cm-1处脂肪氢、1 800cm-1~1 000cm-1处含氧官能团和900cm-1~700cm-1处苯环取代结构;2）煤样分子结构中存在的5种羟基官能团,其脱落的难易程度为：羟基环氢键〈羟基π氢键〈自缔合羟基氢键〈羟基N氢键〈羟基醚氢键;3）与原煤样相比,自然溶胀煤样面内不对称—CH2增加88.76%,—CH减少65.42%,含氧官能团和芳环结构变化不大,苯环四取代和五取代结构减少50%左右,三取代和二取代结构分别增加150%和57%,说明与苯环相连的侧链断裂;4）与自然溶胀煤样相比,经进一步微波溶胀,煤样的—CH3和—CH分别增加2.7倍和3.6倍,含氧官能团含量增加,苯环取代结构变化不大,芳环结构减少,这表明微波辐射能够增强溶胀剂对芳环结构的溶解.
Xigou coal sample from Xinjiang Zhundong field were swelled by cavitated creosote oil as solvent at the condition of natural and microwave.Combined with peakfit software and FTIR spectra,the characteristics of the molecular structure of raw coal sample and the effect of swelling the sample in the natural and microwave on its molecular structures were analyzed with qualitative and semi-quantitative.Results of FTIR analysis were that：1）three coal samples can be divided into four region which were 3 600cm-1-3 100cm-1 hydroxyl group,3 000cm-1-2 800cm-1 aliphatic,1 800cm-1-1 000cm-1 oxygen-containing groups and 900cm-1-700cm-1aromatic bonds;2）the peeling off order of five kinds of hydrogen groups exsisted in coal molecular structure was：cyclic OHOH—πself-associated OHOH—NOH—ether O;3）compared with raw coal sample,in the natural swollen coal sample,the contents of asymmetric aliphatic—CH2increased 88.76%,—CH decreased 65.42%,oxygen-containing group and aromatic unchanged,one and two adjacent H deformation all deceased nearly 50%,three and four adjacent H deformation increased 150% and 57%,respectively,which indicated that the chain connected with benzene ring break;4）compared with natural swollen coal sample,in the microwave swollen coal sample,the contents of—CH3and—CH increased 2.7and 3.6times,respectively,oxygen-containing group increased,benzene ring structure changed a little,aromatic decreased,which indicated that microwave radiation could enhance the dissolution of solvent to the aromatic.
出处
《煤炭转化》
CAS
CSCD
北大核心
2015年第4期5-11,共7页
Coal Conversion
基金
国家自然科学基金资助项目(21276219)
新疆维吾尔自治区国际科技合作计划项目(20146007)
关键词
FTIR光谱
溶胀
煤结构
FTIR spectrum
swelling
coal molecular structure
