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Quantitative elucidation of bridge bonds and side chains in brown coals

机译：褐煤中桥键和侧链的定量阐明

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摘要

A combination use of the ruthenium ion catalyzed oxidation reaction and measurement of solid-state ~(13)C NMR spectra was applied to the evaluation of the amount of bridge bonds and side chains in two brown coals. The distribution of carboxylic acids obtained from the oxidation reaction is applicable for determining the distribution of bridge bonds and side chains, while NMR data give the information on the amount of methyl group bonded directly to the aromatic ring. These data were utilized together for evaluating the bridge bonds and side chains quantitatively toward a coal molecule, the molecular weight of which is assumed tentatively as 10,000. As the results, it could be concluded that there are not so many long chains or bridges even in the brown coals, for example, less than 0.2 of C_5 chains are in an assumed molecule, however, the numbers of long chains and bridges in the assumed molecule of brown coal were found to be clearly greater than those in bituminous coal.
机译：结合使用钌离子催化的氧化反应和固态〜（13）C NMR光谱测量，评估了两个褐煤中桥键和侧链的数量。由氧化反应获得的羧酸分布可用于确定桥键和侧链的分布，而NMR数据可提供有关直接键合至芳环的甲基数量的信息。这些数据一起用于量化评估煤分子的桥键和侧链，该煤分子的分子量暂定为10,000。结果，可以得出结论，即使在褐煤中也没有那么多长链或桥，例如，假设分子中的C_5链少于0.2，但是，长链或桥中的长链或桥的数目假定发现褐煤分子明显大于烟煤分子。

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