Abstract A suit of nitrogen-dried maceral concentrates derived from a coking coal and a non-coking coal was investigated to reveal the impact of varying coal main organic constituent, the vitrinite, on their thermoplasticity and pyrolysis products. The thermoplastic development of maceral concentrates during pyrolysis was evaluated via their thermo-swelling and dynamic volatile release. These measurements were then linked to molecular weight distributions of vaporised tars and tetrahydrofuran (THF) extracts obtained from heat-treated samples. Regardless of the vitrinite content, only coking macerals agglomerated during pyrolysis while non-coking macerals retained their powdered structure. This result indicated that although concentrating the vitrinite could alter the extent of coal thermoplasticity, such process could not grant or remove thermoplasticity from a maceral concentrate. This was reflected in the similar molecular weight distribution of solvent extracts produced between the parent coals and their concentrates. In specific, coking concentrates generated extractable materials with a relatively more complex structure, consisting of a bimodal molecular weight distribution with 12–14 Da repeating structures at

中文翻译：

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焦化和非焦化精矿的热塑性发展及其热解产物的分子量分布

摘要 研究了一套来自焦煤和非焦煤的氮干燥微晶精矿，以揭示不同煤的主要有机成分镜质体对其热塑性和热解产物的影响。通过热膨胀和动态挥发物释放来评估热解过程中微晶浓缩物的热塑性发展。然后将这些测量结果与从热处理样品中获得的汽化焦油和四氢呋喃 (THF) 提取物的分子量分布联系起来。无论镜质体含量如何，在热解过程中只有焦化微晶团聚，而非焦化微晶保留其粉末结构。这一结果表明，虽然浓缩镜质体可以改变煤的热塑性程度，这种工艺不能赋予或去除原矿浓缩物的热塑性。这反映在母煤与其浓缩物之间产生的溶剂提取物的相似分子量分布上。具体而言，焦化精矿产生的可萃取材料具有相对更复杂的结构，由双峰分子量分布组成，在