A novel melamine--formaldehyde resin (MFR) supported solid acid with Lewis and Brønsted acid sites was synthesized through the immobilization of acidic ionic liquid and cuprous ion on MFR. The scanning electron microscopy (SEM) characterization showed that addition of PEG-2000 in the synthesis of MFR could promote the formation of regular particles with diameters around 3.7 \mu m. The XRD pattern demonstrated that some cuprous ions were aggregated. The catalytic performance of this acid catalyst was evaluated by acetalization. The results showed that the catalytic activity of MFR with Brønsted acid could be improved by addition of Lewis acid. The solid acid was very efficient for the acetalization of carbonyl compounds and diols with moderate to excellent yields and there was no loss of catalytic activity even after being recycled for 6 runs.
一种新型的
三聚氰胺-
甲醛树脂(MFR)支持的固体酸,通过将酸性
离子液体和
亚铜离子固定在MFR上合成。扫描电子显微镜(
SEM)表征表明,在MFR的合成中添加P
EG-2000可以促进直径约为3.7微米的规则颗粒的形成。XRD图谱显示,一些
亚铜离子发生了聚集。该酸催化剂的催化性能通过
缩醛反应进行评估。结果表明,添加
路易斯酸可以提高具有布朗斯特酸的MFR的催化活性。这种固体酸对羰基化合物和二醇的
缩醛反应非常高效,具有中等到优良的产率,并且即使经过6次回收后也没有催化活性损失。