Abstract A mild controllable oxidation method was developed to depolymerize the macromolecular aromatic clusters of NMH coal into water-soluble products (WSPs) without ring-open reaction. Hydrogen peroxide (H2O2) was employed to oxidize coal sample at 60 °C, and the effect of reaction time on coal conversion and oxidation products was studied. The results showed that H2O2 is able to break bridge bonds and side chains connected to aromatic clusters, while Car-Car bonds of arene keep unchanged at same conditions. After 10 h oxidation, the coal conversion is 83.4 wt% and the aromaticity of oxidation residue is 7.43%, indicating most of aromatics have transferred to WSPs. The aromatic ring distribution in WSP can reflect that of NMH coal to some extent, where 1-ring, 2-ring and 3-ring compounds account for 58.4 mol%, 19.9 mol% and 21.7 mol%, respectively. Moreover, the pyrolysis of NMH coal and oxidation residue was conducted on an online pyrolysis-vacuum ultraviolet photoionization mass spectrometry, and the oxidation of several typical model compounds was also carried out to understand the oxidation mechanism. The results showed that the PhO-RPh bonds between aromatic clusters are most easily destroyed by H2O2. H2O2 oxidation degradation of coal are accompanied by generation of alkenes and decarboxylic reaction.

中文翻译：

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低阶脑猫湖煤过氧化氢氧化降解

摘要 开发了一种温和可控氧化方法，将 NMH 煤的大分子芳香族簇解聚为不发生开环反应的水溶性产物 (WSPs)。采用过氧化氢（H2O2）在60℃下氧化煤样，研究反应时间对煤转化率和氧化产物的影响。结果表明，H2O2 能够破坏连接到芳族簇的桥键和侧链，而芳烃的 Car-Car 键在相同条件下保持不变。氧化 10 h 后，煤的转化率为 83.4 wt%，氧化渣的芳烃度为 7.43%，表明大部分芳烃已转移到 WSP 中。WSP中的芳环分布可以在一定程度上反映NMH煤的芳环分布，其中1环、2环和3环化合物分别占58.4 mol%、19.9 mol%和21.7 mol%，分别。此外，利用在线热解-真空紫外光电离质谱法对NMH煤和氧化渣进行了热解，并对几种典型的模型化合物进行了氧化以了解氧化机理。结果表明，芳香族簇之间的PhO-RPh键最容易被H2O2破坏。煤的H2O2氧化降解伴随着烯烃的生成和脱羧反应。