Abstract The pyrolysis of cellulose produces anhydrosugars, levoglucosan (LGA) in particular, as a primary product. In this work, the liquid phase conversion of anhydrosugars over solid acid catalysts was investigated, mainly using LGA, as a method for producing levoglucosenone (LGO), which is a bio-renewable platform for fine and commodity chemicals. The screening of typical organic solvents revealed they had a significant influence on the type of reaction selectivity and identified dimethyl sulfoxide (DMSO) as a suitable solvent. Among the solid acid catalysts examined, Amberlyst 70 in combination with DMSO was found to work the best, producing LGO with a yield of up to 32.3%-C. The yield of LGO was further improved to 40.4%-C by in-situ removal of water, which promoted undesired reactions, such as hydrolysis of LGA and isomerization of LGO to hydroxymethylfurfural. Moreover, an experiment using bio-oil, derived from cellulose pyrolysis, as the feedstock showed that a portion of heavier saccharides contributed as a source of LGO without inhibiting the conversion of LGA.

中文翻译：

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在固体酸催化剂上提高纤维素衍生的脱水糖液相转化左旋葡萄糖酮的选择性

摘要 纤维素的热解产生脱水糖，特别是左旋葡聚糖 (LGA)，作为主要产品。在这项工作中，研究了脱水糖在固体酸催化剂上的液相转化，主要使用 LGA 作为生产左旋葡萄糖酮 (LGO) 的方法，这是一种用于精细和商品化学品的生物可再生平台。典型有机溶剂的筛选表明它们对反应选择性的类型有显着影响，并确定二甲基亚砜 (DMSO) 是合适的溶剂。在检查的固体酸催化剂中，发现 Amberlyst 70 与 DMSO 结合使用效果最好，生产 LGO 的产率高达 32.3%-C。通过原位去除水，LGO 的产率进一步提高到 40.4%-C，这促进了不需要的反应，如 LGA 水解和 LGO 异构化为羟甲基糠醛。此外，使用源自纤维素热解的生物油作为原料的实验表明，一部分较重的糖类作为 LGO 的来源，不会抑制 LGA 的转化。