The conversion of cellulose into valuable chemicals has attracted much attention, due to the concern about depletion of fossil fuels. The hydrolysis of cellulose is a key step in this conversion, for which Brønsted acidic ionic liquids (BAILs) have been considered promising acid catalysts. In this study, using BAILs with various structures, their acidic catalytic activity for cellulose hydrolysis assisted by microwave irradiation was assessed using the Hammett acidity function (H₀) and theoretical calculations. The glucose yields exceeded 10% when the H₀ values of the BAIL aqueous solutions were below 1.5. The highest glucose yield was about 36% in 1-(1-octyl-3-imidazolio)propane-3-sulfonate (Oimps)/sulfuric acid (H₂SO₄) aqueous solution. A long alkyl side chain on the imidazolium cation, which increased the hydrophobicity of the BAILs, enhanced the glucose yield.

中文翻译：

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用于水介质中纤维素水解的布朗斯台德酸性离子液体：对酸度和葡萄糖产率的结构影响†

由于担心化石燃料的枯竭，将纤维素转化为有价值的化学品引起了很多关注。纤维素的水解是这种转化的关键步骤，为此，布朗斯台德酸性离子液体 (BAIL) 被认为是有前景的酸催化剂。在这项研究中，使用具有不同结构的BAILs，使用Hammett酸度函数（H ₀）和理论计算评估了它们对微波辐照辅助纤维素水解的酸性催化活性。当BAIL水溶液的H ₀值低于1.5时，葡萄糖产率超过10% 。在 1-(1-octyl-3-imidazolio)propane-3-sulfonate (Oimps)/硫酸 (H ₂ SO _{4 ) 中的最高葡萄糖产率约为 36%}) 水溶液。咪唑鎓阳离子上的长烷基侧链增加了 BAIL 的疏水性，从而提高了葡萄糖产量。