摘要
利用X线衍射(XRD)、拉曼光谱(Raman)和红外光谱(FTIR)研究离子液体1-乙基-3-甲基咪唑四氟硼酸盐([EMIm]BF4)和1-丁基-3-甲基咪唑四氟硼酸盐([BMIm]BF4)对煤中微观活性结构的溶解破坏作用。研究结果表明:离子液体处理煤中的矿物质质量分数降低,芳香层片直径减小,说明离子液体能够溶解除去煤中部分无机矿物质,并对微晶结构的脂族侧链有溶解破坏作用;[BMIm]BF4处理煤的结构有序程度提高,侧链支链等无序结构减少;离子液体处理煤中活性较高的羟基、醚氧键含氧类官能团和甲基、亚甲基脂肪烃类官能团的总体质量分数降低,芳环类C—H基团和C=C基团的活性也减弱。[BMIm]BF4对煤中各类微观活性结构的溶解破坏作用要明显强于[EMIm]BF4的破坏作用。
The dissolubility and destruction effects of ionic liquids （ILs） [EMIm]BF4 and [BMIm]BF4 on the microscopic activity structures of gas coal were studied comprehensively based on X-ray diffraction （XRD）, Raman spectroscopy （Raman） and infrared spectroscopy （FTIR） experiments. The rsults show that the mineral content decreases and the aromatic layer diameters of coal treated reduce slightly by ILs [EMIm]BF4 and [BMIm]BF4, which indicates that the ILs can dissolve part of the minerals in coal and destroy the side chains linking with the microcrystalline structure of coal. The order degree of coal structure treated by [BMIm]BF4 increases and the disordered structures such as the side aliphatic chains decrease, confirming the XRD results about the decrease of the side chains of coal. The overall contents of the oxygen functional groups （hydroxyl and ether oxygen bonds） and the aliphatic ones （methyl, methylene groups） reduce in the treated coal, and the activity of the aromatic ring groups such as C--H stretching vibration and C=C stretching vibration reduce. The dissolubility and destruction effect of [BMIm]BF4 on micro activity structure of coal is much stronger than those of [EMIm]BF4.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第5期2008-2013,共6页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51074159
51134023)
江苏省普通高校研究生科研创新计划项目(CXZZ12_0957)
关键词
煤
活性结构
离子液体
X线衍射
拉曼光谱
红外光谱
coal
activity structure
ionic liquids
X-ray diffraction, Raman spectroscopy
infrared spectroscopy
