Abstract

To upgrading the caking property of Shenhua long-flame coal (SH), imidazole ionic liquids (IILs) were used. SH and the treated samples were characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy to reveal the upgrading mechanism. The results showed that IILs treatment could improve the caking property of SH. When exploring the effects of IILs with different chain lengths on the caking property of SH, it was found that the caking index of the treated samples first increased and then decreased with increasing chain length, and [C₅MIM]Cl treatment exhibited the best modification effect among all IILs used. Additionally, an upgrading mechanism of caking property of SH using IILs is proposed. IILs treatment could increase the content of small aromatics with 3–5 rings and decreased the length of side chain alkanes and oxygen content, which could increase the caking property of SH.

中文翻译：

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不同链长咪唑离子液体对神华长焰煤粘结性能的影响

摘要

为了提高神华长焰煤（SH）的粘结性能，使用了咪唑离子液体（IIL）。使用傅里叶变换红外光谱 (FT-IR)、X 射线衍射 (XRD)、X 射线光电子能谱 (XPS) 和拉曼光谱对 SH 和处理后的样品进行表征，以揭示升级机制。结果表明，IILs处理可以改善SH的结块性能。在探讨不同链长的IIL对SH结块性能的影响时发现，处理后的样品的结块指数随着链长的增加先增大后减小，其中[C ₅ MIM]Cl处理表现出最佳的改性效果所有使用的 IIL 之间的影响。此外，还提出了一种使用 IIL 来提高 SH 结块性能的机制。 IILs处理可以增加3-5环小芳烃的含量，降低侧链烷烃的长度和氧含量，从而提高SH的结块性能。