Zn : Al layered double hydroxide-supported 3-aminopropyltriethoxysilane (APTES) and N-methyl 3-aminopropyltriethoxy silane (MAPTES) are found to be efficient, environmentally attractive and selective solid base catalysts for liquid phase aldol condensation reactions at room temperature. The organic functionalized solid catalysts were characterized by XRD, FT-IR, Raman, EDX, SEM, TG-DTA, 13C and 29Si CP MAS NMR techniques. The XRD pattern indicated the anti-parallel monolayer arrangements of organic moieties in the interlayer space of LDH. 29Si NMR confirmed that the linking silicon atom is fully condensed in the framework. The reusability study shows consistent activity of the heterogeneous catalyst after several cycles.
Zn:Al层状双氢氧化物负载的3-
氨丙基三乙氧基
硅烷(AP
TES)和N-甲基3-
氨丙基三乙氧基
硅烷(
MAPTES)被发现是高效的、环境友好的、选择性的固体碱催化剂,适用于室温下液相醛醇缩合反应。这些有机功能化的固体催化剂通过XRD、FT-IR、拉曼光谱、EDX、
SEM、TG-DTA以及13C和29Si CP MAS NMR技术进行了表征。XRD图谱表明有机基团在LDH层间空间呈现反平行单层排列。29Si NMR证实连接的
硅原子在框架中完全缩合。重复使用性研究显示出该非均相催化剂在多次循环后的一致活性。