Abstract A catalytic routine was developed for kraft lignin depolymerization in dioxane-water systems, in which the catalyst HTaMoO6 with strong Bronsted acidity and a hydrogenation catalyst (Rh/C) were employed simultaneously. The performance of the composite catalysts was tested in a series of experiments with various reaction temperatures, reaction time and catalyst ratios. Under the optimized conditions, a higher petroleum ether soluble fraction yield of 58.7% was obtained at 320 °C for 24 h. Besides, a higher liquid product yield of 95.6% was achieved at 290 °C for 2 h. Specially, the main compositions of the petroleum ether soluble fraction are monomers and dimers, which can be used as liquid fuel. These results demonstrated that the composite catalyst HTaMoO6-Rh/C can effectively catalyze the depolymerization of the kraft lignin into small molecule liquid fuel components.

中文翻译：

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二恶烷-水体系中硫酸盐木质素在HTaMoO 6 和Rh/C复合催化剂上的液化

摘要 以强布朗斯台德酸性催化剂HTaMoO6和加氢催化剂(Rh/C)同时使用，开发了二恶烷-水体系中硫酸盐木质素解聚的催化方法。在一系列不同反应温度、反应时间和催化剂比例的实验中测试了复合催化剂的性能。在优化条件下，在320℃下24小时获得了较高的石油醚可溶馏分收率58.7%。此外，在 290°C 下 2 小时实现了 95.6% 的更高液体产物收率。特别是石油醚可溶馏分的主要成分是单体和二聚体，可用作液体燃料。