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<p>The Santanghu Basin in Xinjiang, China, hosts significant tar-rich coal resources, yet marked disparities in tar yields exist between coals derived from the Badaowan and Xishanyao formations, complicating resource exploration and utilization. To elucidate these differences, a comparative study of four coal samples with varying tar yields was conducted. The main results are as follows:<OrderedList> <ListItem> <ItemNumber>1.</ItemNumber> <ItemContent> <p>The macromolecular structural differences between coals with varying tar yields are distinct. The sample with the lowest tar yield exhibits a large aromatic skeleton, primarily composed of fused aromatic layers containing 14–16 rings. In contrast, the sample with the highest tar yield contains aromatic layers with only 5–7 rings.</p> </ItemContent> </ListItem> <ListItem> <ItemNumber>2.</ItemNumber> <ItemContent> <p>The ring-opening decomposition of aromatic structures may be the key chemical process affecting the tar yield. This process arises from the deformation of the aromatic structure influenced by the dangling aliphatic chains, with the deformation being more prone to occur when the aromatic structure is smaller in size and the aliphatic chains are longer.</p> </ItemContent> </ListItem> <ListItem> <ItemNumber>3.</ItemNumber> <ItemContent> <p>The accumulation conditions of coal-forming materials influence the chemical structure, which subsequently affects the pyrolysis process for generating tar and gas. Samples in the shallow overlying water body after peat accumulation would have made the peat susceptible to oxidation, leading to the formation of inertinite components with large aromatic structures and low aliphatic content. Conversely, the samples accumulated in lake-filled swamps with deep water coverage, where the peat was quickly covered by water after accumulation, placing it under relatively reducing conditions that favored the occurrence of gelation and the preservation of aliphatic structures.</p> </ItemContent> </ListItem> </OrderedList></p>

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Differences in molecular structure and pyrolysis behavior of tar-rich coals influenced by accumulation conditions of coal-forming materials: a comparative study of coals from the Xishanyao Formation and Badaowan Formation in the Santanghu basin

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月22日

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  • Hao Chen,
  • Xin Li,
  • Bo Wei,
  • Lin Meng,
  • Xing-gang Wang,
  • Shuo Feng,
  • Xiao-mei Zhang,
  • Yong Tang,
  • Zi-qiang Wang

摘要

The Santanghu Basin in Xinjiang, China, hosts significant tar-rich coal resources, yet marked disparities in tar yields exist between coals derived from the Badaowan and Xishanyao formations, complicating resource exploration and utilization. To elucidate these differences, a comparative study of four coal samples with varying tar yields was conducted. The main results are as follows: 1.

The macromolecular structural differences between coals with varying tar yields are distinct. The sample with the lowest tar yield exhibits a large aromatic skeleton, primarily composed of fused aromatic layers containing 14–16 rings. In contrast, the sample with the highest tar yield contains aromatic layers with only 5–7 rings.

2.

The ring-opening decomposition of aromatic structures may be the key chemical process affecting the tar yield. This process arises from the deformation of the aromatic structure influenced by the dangling aliphatic chains, with the deformation being more prone to occur when the aromatic structure is smaller in size and the aliphatic chains are longer.

 3.

The accumulation conditions of coal-forming materials influence the chemical structure, which subsequently affects the pyrolysis process for generating tar and gas. Samples in the shallow overlying water body after peat accumulation would have made the peat susceptible to oxidation, leading to the formation of inertinite components with large aromatic structures and low aliphatic content. Conversely, the samples accumulated in lake-filled swamps with deep water coverage, where the peat was quickly covered by water after accumulation, placing it under relatively reducing conditions that favored the occurrence of gelation and the preservation of aliphatic structures.