Direct synthesis of acid-base bifunctionalized hexagonal mesoporous silica and its catalytic activity in cascade reactions.
Direct synthesis of acid-base bifunctionalized hexagonal mesoporous silica and its catalytic activity in cascade reactions.
复制标题
DOI：
10.1016/j.jcis.2010.10.042
复制
发表时间：
2011-03
影响因子：
9.9
通讯作者：
F. Shang;Jianrui Sun;Shujie Wu;Hengli Liu;J. Guan;Q. Kan
中科院分区：
文献类型：
--
作者：
F. Shang;Jianrui Sun;Shujie Wu;Hengli Liu;J. Guan;Q. Kan
通过氨基保护的简单共缩合反应，合成了一系列高效的含氨丙基和丙磺酸的酸碱双功能化六方介孔氧化硅催化剂。小角XRD、TEM和N2吸附-脱附测试结果表明，所得材料具有介观结构。X射线光电子能谱、元素分析（EA）、返滴定、29 Si NMR和13 C NMR证实了有机硅氧烷作为二氧化硅骨架的一部分缩合。该催化剂具有良好的酸碱性能，对一锅法脱缩醛-Knoevenagel和脱缩醛-硝基醛醇（亨利）反应具有较高的活性。
A series of efficient acid–base bifunctionalized hexagonal mesoporous silica (HMS) catalysts contained aminopropyl and propanesulfonic acid have been synthesized through a simple co-condensation by protection of amino group. The results of small-angle XRD, TEM, and N2adsorption–desorption measurements show that the resultant materials have mesoscopic structures. X-ray photoelectron spectroscopies, elemental analysis (EA), back titration,29Si NMR and13C NMR confirm that the organosiloxanes were condensed as a part of the silica framework. The resultant catalysts exhibit excellent acid-basic properties, which make them possess high activity for one-pot deacetalization–Knoevenagel and deacetalization–nitroaldol (Henry) reactions.