活性炭负载壳聚糖催化室温无溶剂Knoevenagel缩合反应

通过活性炭(AC)负载壳聚糖(CS)的方法,制备了负载型的"壳聚糖/活性炭"催化剂(CS/AC)。利用FT-IR、XRD、TG-DTG、SEM、BET、元素分析等方法对催化剂进行表征,并系统研究了该催化剂在Knoevenagel缩合反应中的催化性能。结果表明,催化剂具有较好的活性,在室温无溶剂条件下,可以催化一系列芳香醛化合物与活泼亚甲基化合物进行缩合反应,产率均在80%以上;且反应体系放大100倍时,仍然保持较高的催化效率;此外,该催化剂具有较好稳定性,重复使用8次后,仍然保持较高的催化活性。

Knoevenagel Condensation Reaction at Room Temperature under Solvent-free ConditionsCatalyzed byActivated Carbon-Supported Chitosan

The activated carbon (AC) supported chitosan (CS) catalyst, denoted as CS/AC, was prepared by a simple method. Thephysicochemical properties of the as-prepared catalyst were characterized byFT-IR,XRD, TG-DTG, SEM, BET, and elemental analysis. The catalytic performance was tested by the Knoevenagel condensation reaction, and the results showed that the catalyst can efficiently catalyze the Knoevenagel condensation reaction of a series of aromatic aldehydes with active methylene compounds at solvent-free and room temperature conditions, affording more than 80% products yield. Furthermore, when the reaction system is scaled up by 100 times, the catalyst still maintains high catalytic efficiency. Moreover, the catalyst can be recovered by simple filtration and reused at least 8 times without significant loss of activity, indicating that the catalyst is very stable.