Macromolecular model construction and molecular simulation of organic matter in Majiliang vitrain

doi:10.11949/0438-1157.20190835

Abstract

Abstract:

The macromolecular structure model of organic matter in Majiliang vitrain was constructed by means of proximate analysis, ultimate analysis, ¹³C nuclear magnetic resonance spectroscopy(¹³C NMR), Fourier transform infrared spectroscopy(FTIR) and X-ray photoelectron spectroscopy(XPS). In this structural model, the ratio of aromatic ring bridge carbon to peripheral carbon is 0.24, the aromatic compounds mainly exist in the form of anthracene and naphthalene; the aliphatic structure mainly exists in the form of methyl, methylene, methyne and quaternary carbon, the content of oxygen-bound aliphatic carbon is the least; each macromolecule contains an average of 22 oxygen atoms, the oxygen atoms exist in the form of phenolic hydroxyl group, carbonyl group, carboxyl group and ether oxygen with the numbers of 9, 4, 3 and 3, respectively; nitrogen atoms exist in the form of a pyridine and a pyrrole. The average molecular formula of the macromolecule is $C 222 H 168 O 22 N 22$ , and the molecular weight is 3212. The molecular model of the built molecular model was simulated by ¹³C NMR, infrared and density, and compared with the test results. The results show that the model can reflect the macromolecular structure of the organic matter of the Majiliang vitrain.

Key words: coal, model, computational chemistry, molecular simulation, spectral simulation, density simulation

摘要：

运用工业分析、元素分析及¹³C核磁共振波谱、X射线光电子能谱和傅里叶变换红外光谱分析，构建了马脊梁镜煤有机质大分子结构模型。在该结构模型中，芳环桥碳与周碳之比为0.24，芳环的类型以蒽、萘为主；脂肪碳原子主要是甲基、亚甲基和次甲基，氧接脂碳含量最少；每个大分子平均含氧原子22个，氧原子存在于酚羟基、羰基、羧基和醚氧中，个数分别为9、4、3和3；氮原子以一个吡啶和一个吡咯的方式存在。该结构模型的平均分子式为C₂₂₂H₁₆₈O₂₂N₂，分子量为3212。对所建分子模型分别进行了核磁共振碳谱、红外光谱及密度的模拟计算，并与测试结果进行对比验证。结果表明，所建模型能够较好地反映马脊梁镜煤有机质的大分子结构特征。

关键词: 煤, 模型, 计算化学, 分子模拟, 光谱模拟, 密度模拟

CLC Number:

TQ 530

Xingyu ZHOU, Fangui ZENG, Jianhua XIANG, Xiaopeng DENG, Xinghua XIANG. Macromolecular model construction and molecular simulation of organic matter in Majiliang vitrain[J]. CIESC Journal, 2020, 71(4): 1802-1811.

周星宇, 曾凡桂, 相建华, 邓小鹏, 相兴华. 马脊梁镜煤有机质大分子模型构建及分子模拟[J]. 化工学报, 2020, 71(4): 1802-1811.

Figures/Tables 19

Table 1 Proximate and ultimate analyses of MBC

$R m a x 0$ /%	Proximate analysis/ % (mass)			Ultimate analysis/% (mass, daf)
$R m a x 0$ /%	$M a d$	$A d$	$V d a f$	C	H	O	N	S
0.74	1.70	20.30	38.18	81.69	5.09	11.14	1.35	0.73

Table 1 Proximate and ultimate analyses of MBC

$R m a x 0$ /%	Proximate analysis/ % (mass)			Ultimate analysis/% (mass, daf)
$R m a x 0$ /%	$M a d$	$A d$	$V d a f$	C	H	O	N	S
0.74	1.70	20.30	38.18	81.69	5.09	11.14	1.35	0.73

Fig.1 13C NMR spectrum of MBC

Fig.2 13C NMR peak fitting spectra of MBC

Table 2 Structural parameters determined by 13C NMR of MBC

$f a$	$f a C$	$f a'$	$f a H$	$f a N$	$f a P$	$f a S$	$f a B$	$f a l$	$f a l *$	$f a l H$	$f a l O$
74.24%	5.10%	69.14%	45.68%	23.46%	6.08%	4.06%	13.32%	25.76%	10.05%	12.64%	3.07%

Table 2 Structural parameters determined by 13C NMR of MBC

$f a$	$f a C$	$f a'$	$f a H$	$f a N$	$f a P$	$f a S$	$f a B$	$f a l$	$f a l *$	$f a l H$	$f a l O$
74.24%	5.10%	69.14%	45.68%	23.46%	6.08%	4.06%	13.32%	25.76%	10.05%	12.64%	3.07%

Fig.3 X-Ray photoelectron spectra N (1s) structure of MBC

Table 3 X-Ray photoelectron spectra N (1s) data of MBC

Attribution	Peak information
Attribution	Binding energy/eV	areafitTP ω_mol/%
pyridine nitrogen	398.90	40.48
pyrrole nitrogen	400.44	44.54
quaternary nitrogen	402.01	6.49
nitrogen oxide	403.06	8.49

Fig.4 X-Ray photoelectron spectra S(2p) structure of MBC

Table 4 X-Ray photoelectron spectra S(2p) data of MBC

Attribution	Peak information
Attribution	Binding energy/eV	areafitTP ω_mol/%
mercaptan thiophenol	163.96	58.79
thiophene type sulfide	165.83	8.48
sulfoxide sulfur	168.06	10.79
sulfone type sulfur	169.45	13.72
inorganic sulfur	171.06	8.20

Fig.5 FTIR spectra peak fitting of MBC (1000—1800 cm-1)

Table 5 FTIR absorption peak parameters of MBC (1000—1800 cm-1)

Serial No.	Peak position / $c m - 1$	Relative area/％	Attribution
1	1010.93	10.57	灰分
2	1036.28	9.59	灰分
3	1058.61	4.55	灰分
4	1098.27	10.99	酚、醇、醚、苯氧基、酯中C—O伸缩振动
5	1184.82	10.02	酚、醇、醚、苯氧基、酯中C—O伸缩振动
6	1265.14	7.05	酚、醇、醚、苯氧基、酯中C—O伸缩振动
7	1335.24	6.66	酚、醇、醚、苯氧基、酯中C—O伸缩振动
8	1383.41	3.96	$C H 3$ —对称弯曲振动
9	1419.54	3.48	$C H 3$ ， $C H 2$ —的不对称变形振动
10	1448.36	4.61	$C H 3$ ， $C H 2$ —的不对称变形振动
11	1488.44	4.79	芳香烃的CC骨架振动
12	1570.09	6.71	芳香烃的CC骨架振动
13	1608.64	9.72	芳香烃的CC骨架振动
14	1649.66	4.68	共轭的 CO 的伸缩振动
15	1706.90	2.62	羧酸的 CO 的伸缩振动

Table 5 FTIR absorption peak parameters of MBC (1000—1800 cm-1)

Serial No.	Peak position / $c m - 1$	Relative area/％	Attribution
1	1010.93	10.57	灰分
2	1036.28	9.59	灰分
3	1058.61	4.55	灰分
4	1098.27	10.99	酚、醇、醚、苯氧基、酯中C—O伸缩振动
5	1184.82	10.02	酚、醇、醚、苯氧基、酯中C—O伸缩振动
6	1265.14	7.05	酚、醇、醚、苯氧基、酯中C—O伸缩振动
7	1335.24	6.66	酚、醇、醚、苯氧基、酯中C—O伸缩振动
8	1383.41	3.96	$C H 3$ —对称弯曲振动
9	1419.54	3.48	$C H 3$ ， $C H 2$ —的不对称变形振动
10	1448.36	4.61	$C H 3$ ， $C H 2$ —的不对称变形振动
11	1488.44	4.79	芳香烃的CC骨架振动
12	1570.09	6.71	芳香烃的CC骨架振动
13	1608.64	9.72	芳香烃的CC骨架振动
14	1649.66	4.68	共轭的 CO 的伸缩振动
15	1706.90	2.62	羧酸的 CO 的伸缩振动

Fig.6 Macromolecular structure model of MBC

Table 6 Structure parameters of MBC molecular structural mode

Molecular formula	Molecular weight	Element content/%				Aromaticity/%
Molecular formula	Molecular weight	C	H	O	N	Aromaticity/%
$C 222 H 168 O 22 N 2$	3212	82.94	5.13	10.96	0.97	69.14

Table 6 Structure parameters of MBC molecular structural mode

Molecular formula	Molecular weight	Element content/%				Aromaticity/%
Molecular formula	Molecular weight	C	H	O	N	Aromaticity/%
$C 222 H 168 O 22 N 2$	3212	82.94	5.13	10.96	0.97	69.14

Fig.7 Macromolecular structure model of SDC[25]

Table 7 Types and quantities of aromatic structural units of MBC and SDC structure

Type	Quantities of aromatic structural units
Type	SDC	MBC
	0	5
	9	5
	5	4
	1	1
	1	1

Fig.8 Experimental and calculated 13C NMR spectra of MBC

Fig.9 Energy-minimum conformation of MBC coal model

Fig.10 Experimental and calculated FTIR spectra of MBC model

Fig.11 Relationship between total potential energy and density of MBC model

Fig.12 Geometric configuration of MBC coal structure with a density of 1.37 g/cm3

References 40

1	彭苏萍, 张博, 王佟. 我国煤炭资源“井”字形分布特征与可持续发展战略[J]. 中国工程科学, 2015, 17(9): 29-35.
	Peng S P, Zhang B, Wang T. China s coal resources “well” shape distribution characteristics and sustainable development strategy [J]. China Engineering Science, 2015, 17(9): 29-35.
2	谢和平, 王金华, 王国法, 等. 煤炭革命新理念与煤炭科技发展构想[J]. 煤炭学报, 2018, 43(5): 1187-1197.
	Xie H P, Wang J H, Wang G F, et al. The new concept of coal revolution and the conception of coal science and technology development[J]. Journal of China Coal Society, 2018, 43(5): 1187-1197.
3	王素珍. 《物质结构与性质》和《有机化学基础》模块的教学时序对“有机物分子结构与性质”学习影响的研究[J]. 化学教学, 2014, (6): 16-19.
	Wang S Z. Study on the influence of the teaching time series of “Material Structure and Properties” and “Organic Chemistry Foundation” module on the learning and structure of organic matter[J]. Chemical Teaching, 2014, (6): 16-19.
4	Heek K H V. Progress of coal science in the 20th century[J]. Fuel, 2000, 79(1): 1-26.
5	Mathews J P, Chaffee A L. The molecular representations of coal — a review[J]. Fuel, 2012, 96(1): 1-14.
6	高天明, 张艳. 中国煤炭资源高效清洁利用路径研究[J]. 煤炭科学技术, 2018, 46(7): 157-164.
	Gao T M, Zhang Y. Study on the path of efficient and clean utilization of coal resources in China [J]. Coal Science and Technology, 2018, 46 (7): 157-164.
7	Xue Y, Zhao W N, Ma P, et al. Ternary blends of biodiesel with petro-diesel and diesel from direct coal liquefaction for improving the cold flow properties of waste cooking oil biodiesel[J]. Fuel, 2016, 177: 46-52.
8	王宝俊, 张玉贵, 谢克昌. 量子化学计算在煤的结构与反应性研究中的应用[J]. 化工学报, 2003, 54(4): 477-488.
	Wang B J, Zhang Y G, Xie K C. Application of quantum chemistry calculation to investigation on coal structure and reactivity[J]. Journal of Chemical Industry and Engineering(China), 2003, 54(4): 477-488.
9	张硕, 张小东, 杨延辉, 等. 溶剂萃取下构造煤的XRD结构演化特征[J]. 光谱学与光谱分析, 2017, 37(10): 3220-3224.
	Zhang S, Zhang X D, Yang Y H, et al. XRD structure evolution characteristics of structural coal extracted with solvent [J]. Spectroscopy and Spectral Analysis, 2017, 37(10): 3220-3224.
10	刘振宇. 煤化学的前沿与挑战: 结构与反应[J]. 中国科学: 化学, 2014, 44(9): 1431-1438.
	Liu Z Y. Advancement in coal chemistry: structure and reactivity[J]. Scientia Sinica Chimica, 2014, 44(9): 1431-1435.
11	Shine J H. From coal to single-stage and two-stage products: a reactive model of coal structure [J]. Fuel, 1984, 63(9): 1187-1196.
12	蔺华林, 李克健, 章序文. 上湾煤及其惰质组富集物的结构表征与模型构建[J]. 燃料化学学报, 2013, 41(6): 641-648.
	Lin H L, Li K J, Zhang X W. Structure characterization and model construction of Shangwan coal and it s inertinite concentrated[J]. Journal of Fuel Chemistry and Technology, 2013, 41(6): 641-648.
13	崔馨, 严煌, 赵培涛. 煤分子结构模型构建及分析方法综述[J]. 中国矿业大学学报, 2019, 48(4): 704-717.
	Cui X, Yan H, Zhao P T. Summary of the construction and analysis methods of coal molecular structure model[J]. Journal of China University of Mining & Technology, 2019, 48(4): 704-717.
14	Li W, Zhu Y M, Chen S B, et al. Research on the structural characteristics of vitrinite in different coal ranks[J]. Fuel, 2013, 107(9): 647-652.
15	Yan G C, Zhang Z Q, Yan K F. Reactive molecular dynamics simulations of the initial stage of brown coal oxidation at high temperatures[J]. Molecular Physics, 2013, 111(1): 147-156.
16	Xiang J H, Zeng F G, Li B, et al. Construction of macromolecular structural model of anthracite from Chengzhuang coal mine and its molecular simulation[J]. Journal of Fuel Chemistry and Technology, 2013, 41(4): 391-400.
17	秦志宏. 煤嵌布结构模型理论[J]. 中国矿业大学学报, 2017, 46(5): 939-958.
	Qin Z H. The theory of coal inlay structure model[J]. Journal of China University of Mining & Technology, 2017, 46(5): 939-958.
18	冯炜, 高红凤, 王贵, 等. 枣泉煤分子模型构建及热解的分子模拟[J]. 化工学报, 2019, 70(4): 1522-1531.
	Feng W, Gao H F, Wang G, et al. Molecular model construction of Zaoquan coal and molecular simulation of pyrolysis[J]. CIESC Journal, 2019, 70(4): 1522-1531.
19	Meng J Q, Zhong R Q, Li S C, et al. Molecular model construction and study of gas adsorption of Zhaozhuang coal[J]. Energy & Fuels, 2018, 32(9): 9727-9737.
20	Gao M J, Li X X, Guo L. Pyrolysis simulations of Fugu coal by large-scale ReaxFF molecular dynamics[J]. Fuel Processing Technology, 2018, 178: 197-205.
21	王建国, 赵晓红. 低阶煤清洁高效梯级利用关键技术与示范[J]. 中国科学院院刊, 2012, 27(3): 382-388.
	Wang J G, Zhao X H. Key technologies and demonstration of low-rank coal clean and efficient cascade utilization[J]. Journal of the Chinese Academy of Sciences, 2012, 27(3): 382-388.
22	李昌盛. 大同煤系地层中火成岩对煤层的影响研究[J]. 华北国土资源, 2017, (2): 58-59.
	Li C S. Study on the influence of igneous rocks on coal seam in Datong coal measures strata[J]. Huabei Land and Resources, 2017, (2): 58-59.
23	孙昱东, 王雪, 魏成, 等. 固定床渣油加氢脱金属废催化剂上焦炭结构和组成沿床层变化研究[J]. 燃料化学学报, 2019, 47(2): 167-173.
	Sun Y D, Wang X, Wei C, et al. Research for structure and composition of coke on spent commercial residue hydrotreating catalysts along HDM bed[J]. Journal of Fuel Chemistry and Technology, 2019, 47(2): 167-173.
24	赵云刚. 脱灰处理对伊敏褐煤微观结构影响的实验与分子模拟研究[D]. 太原: 太原理工大学, 2018.
	Zhao Y G. Experimental and molecular simulation study on the effect of deashing treatment on the microstructure of Yimin lignite [D]. Taiyuan: Taiyuan University of Technology, 2018.
25	贾建波, 曾凡桂, 孙蓓蕾. 神东2-2煤镜质组大分子结构模型¹³C-NMR谱的构建与修正[J]. 燃料化学学报, 2011, 39(9): 652-657.
	Jia J B, Zeng F G, Sun B L. Construction and modification of ¹³C-NMR spectra of macromolecular structure model of Shendong 2-2 coal mirror group[J]. Journal of Fuel Chemistry and Technology, 2011, 39(9): 652-657.
26	Xiang J H, Zeng F G, Liang H Z, et al. Model construction of the macromolecular structure of Yanzhou coal and its molecular simulation[J]. Journal of Fuel Chemistry and Technology, 2011, 39(7): 481-488.
27	鄢晓忠, 邱靖, 尹艳山, 等. 褐煤中官能团对其燃烧特性的影响[J]. 煤炭科学技术, 2016, 44(4): 169-174.
	Yan X Z, Qiu J, Yin Y S, et al. Effect of functional groups on the combustion characteristics of lignite[J]. Coal Science and Technology, 2016, 44(4): 169-174.
28	葛涛, 张明旭, 马祥梅. 新阳炼焦煤结构的FTIR和XPS谱学表征[J]. 光谱学与光谱分析, 2017, 37(8): 2406-2411.
	Ge T, Zhang M X, Ma X M. FTIR and XPS spectral characterization of coking coal structure in Xinyang [J]. Spectroscopy and Spectral Analysis, 2017, 37(8): 2406-2411.
29	魏强, 唐跃刚, 李薇薇, 等. 煤中有机硫结构研究进展[J]. 煤炭学报, 2015, 40(8): 1911-1923.
	Wei Q, Tang Y G, Li W W, et al. Progress in the study of organic sulfur structure in coal [J]. Journal of Coal, 2015, 40 (8): 1911-1923.
30	申曙光, 李焕梅, 王涛, 等. 煤化程度对煤基固体酸结构及其水解纤维素性能的影响[J]. 燃料化学学报, 2013, 41(12): 1466-1472.
	Shen S G, Li H M, Wang T, et al. Influence of degree of coal mineralization on structure of coal-based solid acid and its hydrolytic cellulose performance [J]. Journal of Fuel Chemistry and Technology, 2013, 41(12): 1466-1472.
31	李美芬, 曾凡桂, 孙蓓蕾, 等. 低煤级煤热解H₂生成动力学及其与第一次煤化作用跃变的关系[J]. 物理化学学报, 2009, 25(12): 2597-2603.
	Li M F, Zeng F G, Sun B L, et al. The kinetics of H₂ formation in pyrolysis of low coal grade coal and its relationship with the first coalification jump [J]. Journal of Physical Chemistry, 2009, 25 (12): 2597-2603.
32	李伍, 朱炎铭, 陈尚斌, 等. 低煤级煤生烃与结构演化的耦合机理研究[J]. 光谱学与光谱分析, 2013, 33(4): 1052-1056.
	Li W, Zhu Y M, Chen S B, et al. Coupling mechanism of hydrocarbon generation and structure evolution in low coal grade coal[J]. Spectroscopy and Spectral Analysis, 2013, 33(4): 1052-1056.
33	Dong K, Zeng F G, Jia J C, et al. Molecular simulation of the preferential adsorption of CH₄ and CO₂ in middle-rank coal[J]. Molecular Simulation, 2019, 45(1): 15-25.
34	相建华, 曾凡桂, 梁虎珍, 等. 不同变质程度煤的碳结构特征及其演化机制[J]. 煤炭学报, 2016, 41(6): 1498-1506.
	Xiang J H, Zeng F G, Liang H Z, et al. Carbon structure characteristics and evolution mechanism of coal with different metamorphic degrees[J]. Journal of China Coal Society, 2016, 41(6): 1498-1506.
35	Li Z K, Wei X Y, Yan H L, et al. Advances in lignite extraction and conversion under mild conditions[J]. Energy Fuel, 2015, 29: 6869-6886.
36	李壮楣, 王艳美, 李平, 等. 宁东红石湾煤大分子模型构建及量子化学计算[J]. 化工学报, 2018, 69(5): 2208-2216.
	Li Z M, Wang Y M, Li P, et al. Construction of macromolecular model and quantum chemical calculation of Hongshiwan coal in Ningdong [J]. CIESC Journal, 2018, 69 (5): 2208-2216.
37	Jia J B, Wang Y, Li F H, et al. IR spectrum simulation of molecular structure model of Shendong coal vitrinite by using quantum chemistry method[J]. Spectroscopy & Spectral Analysis, 2014, 34(1): 47-51.
38	马延平, 相建华, 李美芬, 等. 柳林3#镜煤吡啶残煤大分子结构模型及分子模拟[J]. 燃料化学学报, 2012, 40(11): 1300-1309.
	Ma Y P, Xiang J H, Li M F, et al. Macromolecular structure model and molecular simulation of Liulin 3# mirror coal pyridine residual coal[J]. Journal of Fuel Chemistry and Technology, 2012, 40(11): 1300-1309.
39	张小东, 郝宗超, 张硕, 等. 溶剂改造下构造煤纳米级孔隙的差异性变化及机理[J]. 中国矿业大学学报, 2017, 46(1): 148-154.
	Zhang X D, Hao Z C, Zhang S, et al. The variation and mechanism of nano-scale pores in tectonic coal under solvent modification[J]. Journal of China University of Mining & Technology, 2017, 46(1): 148-154.
40	Li Z, Ward C R, Gurba L W. Occurrence of non-mineral inorganic elements in macerals of low-rank coals[J]. Int. J. Coal Geol. , 2010, 81(4): 242-250.

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