Homogenous hydrolysis of cellulose to glucose in an inorganic ionic liquid catalyzed by zeolites
Homogenous hydrolysis of cellulose to glucose in an inorganic ionic liquid catalyzed by zeolites
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DOI：
10.1007/s10570-020-03411-3
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发表时间：
2020-09
期刊：
影响因子：
5.7
通讯作者：
Tao Wu;Ning Li;Xuejun Pan;Sheng-Li Chen
中科院分区：
文献类型：
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作者：
Tao Wu;Ning Li;Xuejun Pan;Sheng-Li Chen
摘要合成了不同硅铝比的ZSM-5和Beta分子筛作为固体酸，在温和条件下，在无机离子液体体系（LiB_2H_3溶液，LBTH）中水解纤维素。结果表明，分子筛的织构性质对纤维素水解反应的催化活性影响不大，而分子筛的酸性对纤维素水解反应的催化活性起决定性作用。在LBTH体系中，H型沸石通过与Li+的离子交换将H+从它们的酸中心释放到溶液中，这水解了已经溶解的纤维素。这种独特的均相水解机理是沸石在LBTH体系中催化纤维素水解的优异性能的主要原因。结果表明，在140 °C下，2%（w/w）的沸石可以在3 h内将纤维素完全水解为葡萄糖和低聚葡聚糖，单程葡萄糖得率为61%。再生后的沸石可回收50%的初始催化活性，并可重复使用，催化活性稳定。
AbstractZeolites (ZSM-5 and Beta) with different SiO2/Al2O3ratios were synthesized as solid acids for hydrolyzing cellulose in an inorganic ionic liquid system (lithium bromide trihydrate solution, LBTH) under mild conditions. The results indicated that the texture properties of zeolite had little effect on catalytic activity, while acidity of zeolite was crucial to the cellulose hydrolysis. In the LBTH system, H-form zeolites released H+into the solution from their acid sites via ion-exchange with Li+, which hydrolyzed the cellulose already dissolved. This unique homogeneous hydrolysis mechanism was the primary reason for the excellent performance of the zeolites in catalyzing cellulose hydrolysis in the LBTH system. It was found cellulose could be completely hydrolyzed to glucose and oligoglucan by 2% (w/w on cellulose) zeolite at 140 °C within 3 h with a single-pass glucose yield 61%. The zeolites could be recovered with 50% initial catalytic activity after regeneration and reused with stable catalytic activity.Graphic abstract