摘要
煤中大分子芳香骨架结构决定着煤焦及其气化反应活性。为实现煤的高效转化,对煤大分子骨架结构的认识非常关键,以硅胶为固定相,乙腈、四氢呋喃、吡啶和N-甲基吡咯烷酮为溶剂对来自平朔和黑岱沟两种中国典型动力煤进行分级抽提,经凝胶色谱对所得到的大分子样品的分子量测定、X射线衍射仪对大分子芳香层片结构进行解析,利用同步荧光对芳香结构的缩合程度分析,获得两种煤结构中大分子结构单元、芳香核和芳香层片大小。结果表明,两种煤大分子芳香层片的尺寸为3～3.95nm,堆积高度为0.8～1.2nm。分子量分布范围在400～1 130amu之间,结构单元的缩合芳香环数为3～7个。
Coal structure, especially the macromolecular aromatic skeleton structure, has a strong influence on coke reactivity and coal gasification, so it is the key to grasp the macromolecular aromatic skeleton coal structure for getting the reasonable high efficiency utilization of coal. However, it is difficult to acquire their information due to the complex compositions and structure of coal. It has been found that the macromolecular aromatic network coal structure would be most isolated if small molecular of coal was first extracted. Then the macromolecular aromatic skeleton coal structure would be clearly analyzed by instruments, such as X-ray diffraction （XRD）, fluorescence spectroscopy with synchronous mode （SymF）, Gel permeation chromatography （GPC） etc. Based on the previous results, according to the stepwise fractional liquid extraction, two Chinese typical power coals, PS and HDG, were extracted by silica gel as stationary phase and acetonitrile, tetrahydrofuran （THF）, pyridine and 1-methyl-2-pyrollidinone （NMP） as a solvent group for sequential elution. GPC, Syn-F and XRD were applied to investigate molecular mass distribution, condensed aromatic structure and crystal characteristics. The results showed that the size of aromatic layers （L,） is small（3-3.95 nm） and the staeking heights （Lc） are 0.8-1.2 nm. The molecular mass distribution of the maeromoleeular aro- matic network structure is between 400 and 1 130 ainu, with condensed aromatic numbers of 3-7 in the structure units.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2012年第7期1979-1983,共5页
Spectroscopy and Spectral Analysis
基金
国家(973计划)项目(2011CB201303)
高等学校博士学科点专项科研基金课题项目(20101402120009)资助
关键词
中国动力煤
芳香层片
大分子网络特征
同步荧光
X射线衍射
Chinese power coal
Aromatic layer
Macromolecular network characteristics
Synchronous fluorescence spectrosco-py
X-ray diffraction
