Polyoxometalate-based Ionic liquid as thermoregulated and environmentally friendly catalyst for starch oxidation
Polyoxometalate-based Ionic liquid as thermoregulated and environmentally friendly catalyst for starch oxidation
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DOI：
10.1016/j.apcatb.2013.02.028
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发表时间：
2013-07
影响因子：
22.1
通讯作者：
Xiaoli Chen;Bouasavanh Souvanhthong;Hang Wang;Hongwei Zheng;Xiaohong Wang;M. Huo
中科院分区：
文献类型：
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作者：
Xiaoli Chen;Bouasavanh Souvanhthong;Hang Wang;Hongwei Zheng;Xiaohong Wang;M. Huo
以氯化胆碱和H5 PMo 10 V2 O 40为前驱体，采用沉淀/离子交换法合成了一种新型聚氧乙烯酸盐（POM）离子液体[（CH 3）3 NCH 2CH 2 OH] 5 PV 2 Mo 10 O 40（简称Ch 5 PMo 10 V2 O 40）。所产生的盐原来是一个原始的离子液体（IL）催化剂，并表现出一种新的基于温度变化的可切换性能。在这方面，它指的是温度升高导致催化剂和底物溶解的温度调节特征。随着温度的降低，催化剂沉淀并变成非均相形式以从反应混合物中自动分离。POM与氯化胆碱的组合也被证明是有效的催化淀粉的氧化，表现出更高或接近传统催化剂，如硫酸亚铁的性能。结果表明，该催化剂易于与产物分离，回收的Ch 5 PMo 10 V2 O 40可重复使用，其性能无明显损失，突出了这一重要生物质的实际应用。
A new kind of polyoxometalate (POM) ionic liquid ([(CH3)3NCH2CH2OH]5PV2Mo10O40) (abbreviated as Ch5PMo10V2O40) has been synthesized by a precipitation/ion exchange method with choline chloride and H5PMo10V2O40as precursors. The produced salt turned out to be an original ionic liquid (IL) catalyst and exhibited a novel switchable property based on temperature variation. In this regard, it refers to a thermoregulated feature that elevated temperature leads to the miscibility of catalyst and substrate. As decreasing the temperature, the catalyst precipitates and becomes heterogeneous form to be separated automatically from the reaction mixture. The combination of POMs with choline chloride was also proved to be effective in catalyzing the oxidation of starch, which showed higher or nearly identical performance with traditional catalysts, such as FeSO4. Results demonstrated the catalyst was easily separated from the products and the retrieved Ch5PMo10V2O40could be repeatedly used without appreciable loss of its performance, which highlighted the practical application of this important biomass.