Ionic Liquid−Water Mixtures: Enhanced Kw for Efficient Cellulosic Biomass Conversion

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• 作者：Yuetao Zhang ; Hongbo Du ; Xianghong Qian ; Eugene Y.-X. Chen
• 刊名：Energy & Fuels
• 出版年：2010
• 出版时间：April 15, 2010
• 年：2010
• 卷：24
• 期：4
• 页码：2410-2417
• 全文大小：865K
• 年卷期：v.24,no.4(April 15, 2010)
• ISSN：1520-5029

文摘

Under relatively mild conditions (≤140 °C, 1 atm) and in the absence of added acid catalysts typically employed in biomass conversion, cellulose dissolved in certain ionic liquids (ILs) has been converted into water-soluble reducing sugars in high total reducing sugar yield (up to 97%), or directly into the biomass platform chemical 5-hydroxymethyl furfural (HMF) in high conversion (up to 89%) when CrCl₂ is added. The combined study of experimental methods and ab initio calculations demonstrates that the significantly increased K_w by ILs in the IL−water mixture is responsible for the catalysis seen in the current efficient biomass conversion system without added acid catalysts. The finding that the water in ILs under mild conditions can exhibit high K_w values (up to 3 orders of magnitude higher than the pure water under ambient conditions) is significant because such high K_w values are typically achievable by the water under harsh high-temperature or subcritical water conditions.