文献类型：期刊文献

英文题名：Small-Sized Mg-Al LDH Nanosheets Supported on Silica Aerogel with Large Pore Channels: Textural Properties and Basic Catalytic Performance after Activation

作者：Wang, Lijun[1];Wang, Yusen[1];Wang, Xiaoxia[1];Feng, Xiaolan[1];Ye, Xiao[1];Fu, Jie[1]

机构：[1]Shaoxing Univ, Sch Chem & Chem Engn, Shaoxing 312000, Peoples R China

年份：2018

卷号：8

期号：2

外文期刊名：NANOMATERIALS

收录：SCI-EXPANDED(收录号：WOS:000427534600060)、、Scopus(收录号：2-s2.0-85042369653)、WOS

基金：This work was supported by the National Natural Science Foundation of China (Grant No. 51402195). We thank Na Ye, Xiudong Li, Qiumei Xu, Ping Fang, Yinying Jin, Linxia Wang and Ruijuan Lu from the Analysis and Test Center of Shaoxing University for the useful discussion.

语种：英文

外文关键词：layered double hydroxides; nanocatalysts; mesoporous silica; support; solid base

外文摘要：Layered double hydroxides (LDHs) have been widely used as an important subset of solid base catalysts. However, developing low-cost, small-sized LDH nanoparticles with enhanced surface catalytic sites remains a challenge. In this work, silica aerogel (SA)-supported, small-sized Mg-Al LDH nanosheets were successfully prepared by one-pot coprecipitation of Mg and Al ions in an alkaline suspension of crushed silica aerogel. The supported LDH nanosheets were uniformly dispersed in the SA substrate with the smallest average radial diameter of 19.2 nm and the thinnest average thickness of 3.2 nm, both dimensions being significantly less than those of the vast majority of LDH nanoparticles reported. The SA/LDH composites also showed large pore volume (up to 1.3 cm(3).g) and pore diameter (> 9 nm), and therefore allow efficient access of reactants to the edge catalytic sites of LDH nanosheets. In a base-catalyzed Henry reaction of benzaldehyde with nitromethane, the SA/LDH catalysts showed high reactant conversions and favorable stability in 6 successive cycles of reactions. The low cost of the SA carrier and LDH precursors, easy preparation method, and excellent catalytic properties make these SA/LDH composites a competitive example of solid-base catalysts.