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首页> 外文期刊>Fuel >Effects of chemical composition, disorder degree and crystallite structure of coal macromolecule on nanopores (0.4-150 nm) in different rank naturally-matured coals
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Effects of chemical composition, disorder degree and crystallite structure of coal macromolecule on nanopores (0.4-150 nm) in different rank naturally-matured coals

机译：煤大分子化学组成，无序度和微晶结构对不同等级自然成熟煤中纳米孔（0.4-150 nm）的影响

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摘要

Nanoscale pores have been proven the major space for coalbed methane storage and important tunnels for coalbed methane transport. In this study, the influences of chemical composition, disorder degree and crystallite structure of coal macromolecule on the nanoscale pores were investigated by using different rank nature-matured coal samples via the methods of nuclear magnetic resonance (NMR), Raman spectroscopy, X-ray diffraction (XRD), low-pressure CO2 adsorption experiment and N-2 adsorption experiment. The results show that the volumes of 0.4-1.1 nm pores in naturally-matured coals show strong correlations with coal crystallite structure and chemical composition, but a weak correlation with disorder degree of coal molecule. In contrast, the volumes of 2-150 nm pores have a good correlation with disorder degree of coal molecule, but have weak correlations with the crystallite structure and chemical composition. When aromatic carbon ratio is smaller than 63%, the volume of 0.4-1.1 nm pores decreases with increasing the aromatic carbon ratio of coal molecules. Beyond that, the volume of 0.4-1.1 nm pores continues increasing with an increase in the aromatic carbon ratio. In addition, when the vitrinite reflectance (R-o) of the coal samples is 0.7%, volume of 0.4-1.1 nm pores increases with increasing the average lateral size (L-a) and stacking height (L-c). The effects of chemical composition and crystallite structure on 0.4-1.1 nm pores of naturally-matured coal samples obtained in this study are consistent to those of artificially-matured coals in our previous study (Liu a al., 2018). Based on the Raman data, the effect of disorder degree of coal molecule on nanoscale pores was also investigated. With D-1/G ratio increasing, volume of 2-150 nm pores increases gradually. Considering that 0.4-1.1 nm pores are mainly related to the characteristics of single basic structural unit (BSU) (L-a, L-c and chemical composition) and 2-150 nm pores are related to arrangement of different BSUs (disorder degree), it is thought that 0.4-1.1 nm pores are formed inner BSUs and 2-150 nm pores are formed in the space between different BSUs.
机译：纳米级孔隙已被证明是煤层气储存的主要空间和煤层气运输的重要通道。本研究通过核磁共振，拉曼光谱，X射线等方法，使用不同等级的自然成熟煤样品，研究了煤大分子的化学组成，无序度和微晶结构对纳米级孔的影响。衍射（XRD），低压CO2吸附实验和N-2吸附实验。结果表明，自然成熟煤中0.4-1.1 nm的孔体积与煤的微晶结构和化学组成具有很强的相关性，而与煤分子无序度的相关性较弱。相反，2-150 nm孔的体积与煤分子的无序度具有良好的相关性，而与微晶结构和化学组成的相关性较弱。当芳族碳比率小于63％时，随着煤分子的芳族碳比率增加，0.4-1.1nm孔的体积减小。除此之外，随着芳族碳比率的增加，0.4-1.1nm孔的体积继续增加。此外，当煤样品的镜质体反射率（R-o）> 0.7％时，随着平均横向尺寸（L-a）和堆积高度（L-c）的增加，0.4-1.1 nm孔的体积会增加。本研究中获得的天然熟煤样品的化学成分和微晶结构对0.4-1.1 nm孔隙的影响与我们先前研究中的人工熟煤的影响一致（Liu等人，2018）。根据拉曼数据，研究了煤分子无序度对纳米级孔的影响。随着D-1 / G比的增加，2-150 nm孔的体积逐渐增加。考虑到0.4-1.1 nm的孔主要与单个基本结构单元（BSU）的特性（La，Lc和化学组成）有关，而2-150 nm的孔与不同的BSU的排列有关（无序度），认为在内部的BSU之间形成0.4-1.1nm的孔，在不同的BSU之间的空间中形成2-150nm的孔。

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  • 来源
    《Fuel》 |2019年第15期|553-561|共9页
  • 作者

    Liu Yu; Zhu Yanming; Chen Shangbin;

  • 作者单位

    China Univ Min & Technol, Key Lab Coalbed Methane Resources & Reservoir For, Minist Educ, Xuzhou 221008, Jiangsu, Peoples R China|China Univ Min & Technol, Sch Resources & Geosci, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Key Lab Coalbed Methane Resources & Reservoir For, Minist Educ, Xuzhou 221008, Jiangsu, Peoples R China|China Univ Min & Technol, Sch Resources & Geosci, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Key Lab Coalbed Methane Resources & Reservoir For, Minist Educ, Xuzhou 221008, Jiangsu, Peoples R China|China Univ Min & Technol, Sch Resources & Geosci, Xuzhou 221116, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nanoscale pores; Coal; Molecular structure; Crystallite structure; Disorder degree;

    机译：纳米孔;煤;分子结构;晶体结构;无序度;

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