Heteropolyanion-based ionic liquids with –SO3H functionalized cations and PMo11VO404− anions were synthesized and applied in the conversion of cellulose into formic acid (FA). It was demonstrated that the as-prepared ILs showed enhanced activity for catalysing cellulose conversion to FA in the presence of oxygen in water compared to H4PMo11VO40. A high FA yield over 50% accompanied by a FA concentration of ∼10% in reaction solution was obtained at 180 °C and in an oxygen pressure of 1.0 MPa. The possible pathway of FA production from cellulose was investigated. It was indicated that the resulting ILs served as bifunctional catalysts with cations catalysing the cellulose hydrolysis to glucose and anions catalysing glucose oxidation to FA. These ILs may find more applications in cellulose conversion.
酸性功能化阳离子和PMo11VO404−阴离子为基础的杂多酸
离子液体被合成并在
纤维素转化为
甲酸(FA)过程中应用。实验表明,在有氧
水的存在下,与H4PMo11VO40相比,制备的
离子液体在催化
纤维素转化为FA的活性有显著提高。在180°C和1.0 MPa
氧气压力下,获得了超过50%的高FA产率,反应溶液中FA浓度约为10%。研究了从
纤维素生产FA的可能途径。结果表明,所得
离子液体作为双功能催化剂,阳离子催化
纤维素水解为
葡萄糖,阴离子催化
葡萄糖氧化为FA。这些
离子液体在
纤维素转化中可能找到更多应用。