Abstract
We experimentally studied the catalytic performances of a series of Brönsted-Lewis acidic N-methyl-2-pyrrolidonium metal chlorides ([Hnmp]Cl/MCl x , where M=Fe, Zn, Al, or Cu) for the hydrolysis of microcrystalline cellulose (MCC) and cotton to produce reducing sugar. A variety of factors, such as temperature, time, ionic liquid (IL) species, IL dosage, and the concentration of the metal chloride were investigated. [Hnmp]Cl/FeCl3 presented the best hydrolysis performance, affording a 98.8% yield of total reducing sugar from MCC (1 h, 100 °C, 0.1 g MCC, 0.2 g acidic IL, 2.0 g [Bmim]Cl as solvent), which is better than or comparable to results previously obtained with other–SO3H functionalized acidic ILs. The hydrolysis performances of [Hnmp]Cl/MCl x were rationalized using density functional theory calculations, which indicated that interactions between the metal chlorides and the cellulose, including charge-transfer interactions are important in the hydrolysis of cellulose and degradation of glucose. This work shows that Brönsted-Lewis acidic ILs are potential catalysts for the hydrolysis of cellulose to produce sugar.
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Zhao, Z., Li, N., Bhutto, A.W. et al. N-methyl-2-pyrrolidonium-based Brönsted-Lewis acidic ionic liquids as catalysts for the hydrolysis of cellulose. Sci. China Chem. 59, 564–570 (2016). https://doi.org/10.1007/s11426-016-5592-1
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DOI: https://doi.org/10.1007/s11426-016-5592-1