Abstract In this paper, pyrolysis behaviors of oxygen-containing structures of Xilinhaote (XLHT) lignite in hydrogen donor solvent (HDS) were investigated to reveal the effect of HDS on the pyrolysis sequence characteristics of XLHT and the difference of the pyrolysis behaviors of oxygen-containing structures in the presence or absence of HDS. Results showed that coal conversion was closely associated to the decomposition of oxygen-containing structures of lignite, and HDS could promote the cleavage of oxygen-containing groups and inhibit the resolidification of decomposed products, while its effect on the pyrolysis sequence of different structures of lignite was tiny. Thermal cleavage of weak aryl-alkyl ether bonds and carbonyl groups of lignite at relatively low temperatures of 280−380 °C contributed to the depolymerization of XLHT lignite to form preashphaltene (PA) with coal conversion and PA yield increasing from 12.85 % and 1.98 % to 64.58 % and 13.08 %, respectively. As the temperature rose to 430 °C, coal conversion was up to 84.13 %, and HDS could promote the cleavage of relatively stable oxygen-containing groups, aryl-aryl ethers, and methylene structures, which was the major contributor to increase coal conversion at relatively high temperatures during liquefaction. Besides, C–O and C O moieties retained on the surface of LR at 430 °C, which netted 12.54 % and 3.52 % of carbon single bond forms, respectively.

中文翻译：

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供氢溶剂存在下含氧结构分解对褐煤转化率的影响

摘要 本文研究了锡林浩特(XLHT)褐煤含氧结构在供氢溶剂(HDS)中的热解行为，揭示了HDS对XLHT热解序列特征的影响以及氧-包含存在或不存在 HDS 的结构。结果表明，煤的转化与褐煤含氧结构的分解密切相关，HDS能促进含氧基团的裂解，抑制分解产物的再凝固，同时对褐煤不同结构的热解顺序有影响。很小。在 280-380 °C 的相对较低的温度下，褐煤的弱芳基-烷基醚键和羰基的热裂解有助于 XLHT 褐煤解聚形成前沥青质 (PA)，煤转化率和 PA 产率分别从 12.85% 和 1.98% 提高分别为 64.58% 和 13.08%。随着温度升至 430 °C，煤转化率高达 84.13%，HDS 可以促进相对稳定的含氧基团、芳基-芳基醚和亚甲基结构的裂解，这是提高煤转化率的主要因素液化过程中温度相对较高。此外，C-O 和 CO 部分在 430 °C 时保留在 LR 的表面，分别形成了 12.54% 和 3.52% 的碳单键形式。分别为 98% 至 64.58% 和 13.08%。随着温度升至 430 °C，煤转化率高达 84.13%，HDS 可以促进相对稳定的含氧基团、芳基-芳基醚和亚甲基结构的裂解，这是提高煤转化率的主要因素液化过程中温度相对较高。此外，C-O 和 CO 部分在 430 °C 时保留在 LR 的表面，分别形成了 12.54% 和 3.52% 的碳单键形式。分别为 98% 至 64.58% 和 13.08%。随着温度升至 430 °C，煤转化率高达 84.13%，HDS 可以促进相对稳定的含氧基团、芳基-芳基醚和亚甲基结构的裂解，这是提高煤转化率的主要因素液化过程中温度相对较高。此外，C-O 和 CO 部分在 430 °C 时保留在 LR 的表面，分别形成了 12.54% 和 3.52% 的碳单键形式。