Amine-functionalized MgAl LDH nanosheets as efficient solid base catalysts for Knoevenagel condensation

作者：Jia, Huanhuan; Zhao, Yuan; Niu, Panpan; Lu, Ningyue; Fan, Binbin^*; Li, Ruifeng^*

来源：Molecular Catalysis, 2018, 449: 31-37.

DOI：10.1016/j.mcat.2018.02.004

• LDH
• Nanosheets
• Delamination
• APTS
• Knoevenagel condensation

In this work, an efficient base catalyst, amine-functionalized MgAl LDH nanosheet, was prepared by grafting aminopropyltriethoxysilane (APTS) on MgAl LDH nanosheets via the condensation between the ethyoxyl groups of APTS and the hydroxyl groups on the surface of MgAl LDH nanosheets. The physical-chemical properties of the prepared samples were characterized by XRD, FT-IR, N-2 adsorption-desorption, TG, SEM, CO2 adsorption and catalytic reactions. The results showed that APTS could be successfully grafted on MgAl LDH nanosheets due to their high surface area and more available and accessible - OH groups. The prepared amine-functionalized MgAl LDH nanosheets showed excellent catalytic performance in Knoevenagel condensation due to the synergistic effects among the grafted amine groups, the LDH nanosheets and reaction substrates. Moreover, the prepared catalysts can be used to catalyze various Knoevenagel condensations, and have well reusability. This method supplies an effective way to fabricate novel base catalysts based on LDHs.

• 出版日期2018-4
• 单位太原理工大学