微波辐射对霍州煤碳结构作用的FTIR研究  

Effect of microwave radiation on carbon structure of Huozhou coal

作　　者：李洋 葛涛[1,2] 张明旭 LI Yang;GE Tao;ZHANG Ming-xu(School of Material Science and Engineering,Anhui University of Science and Technology,Huainan 232001,China;Department of Civil and Environmental Engineering,University of Houston,Houston Texas 77204,United States)

机构地区：[1]安徽理工大学材料科学与工程学院,安徽淮南232001 [2]Department of Civil and Environmental Engineering,University of Houston,Houston Texas 77204

出　　处：《煤炭工程》2020年第9期135-138,共4页Coal Engineering

基　　金：中国博士后科学基金项目(2018M632519);国家自然科学基金项目(E041102);新疆维吾尔自治区自然科学基金项目(2018D01B03)。

摘　　要：选择山西霍州煤进行915MHz微波辐照实验,对微波辐射后表层煤样、底层煤样进行FTIR解析,并与原煤样进行对比分析,研究微波辐射对煤中碳结构的影响。结果表明:霍州煤中芳香结构主要以苯环的二、四取代物形式存在,两者占芳香结构的73.58%,可见煤的缩合程度较低。脂肪结构主要以甲基(—CH3)和亚甲基(—CH2)结构存在,其中,—CH2在总脂肪结构含量中的占比达到77.43%,因此,原煤样品中存在有较多的烷基侧链。经过915MHz微波辐射过后,芳香结构中苯环单取代物和苯环五取代物含量降低,苯环二取代物和四取代物含量上升。微波辐射对煤样结构具有影响,辐射后表层、底层煤样与辐射前煤样相比,脂肪结构中—CH2对称与不对称伸缩振动产生的吸收峰相对含量分别上升了3.77%和10.75%,—CH伸缩振动和—CH3的不对称伸缩振的相对含量分别下降了3.26%、5.68%和0.51%、1.81%。The 915MHz microwave irradiation experiment is carried out on Huozhou coal.The surface coal sample and the bottom coal sample as analyzed by FTIR after microwave irradiation,and compared with the original coal sample to study the effect of microwave radiation on the carbon structure in coal.The results show that the aromatic structure of Huozhou coal mainly exists in the form of disubstituted or tetrasubstituted benzene rings,accounting for 73.58%of the aromatic structure.It can be seen that the degree of condensation of coal is low.The aliphatic structure mainly exists in the structure of—CH3 and methylene—CH2,wherein the proportion of—CH2 in the total fat structure content reaches 77.43%.Therefore,there are more alkyl side chains in the raw coal sample.After 915MHz microwave irradiation,the content of benzene ring monosubstituted and benzene ring pentasubstituted in the aromatic structure decreases,and the content of benzene ring disubstituted and tetrasubstituted compounds increases.Compared with the preirradiation coal sample,the relative content of the methylene(—CH2)symmetry and asymmetric stretching vibration in the aliphatic structure increases by 3.77%and 10.75%,the relative content of CH stretching vibration and CH3 asymmetric stretching vibration decreases by 3.26%,5.68%,and 0.51%,and 1.81%,respectively.

关 键 词：煤 微波 FTIR 芳香结构 脂肪结构 

分 类 号：TQ533.6[化学工程—煤化学工程]