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

School of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China
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Nanomaterials 2018, 8(2), 113; https://doi.org/10.3390/nano8020113
Received: 15 January 2018 / Revised: 9 February 2018 / Accepted: 13 February 2018 / Published: 16 February 2018
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 cm3·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. View Full-Text
Keywords: layered double hydroxides; nanocatalysts; mesoporous silica; support; solid base layered double hydroxides; nanocatalysts; mesoporous silica; support; solid base
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MDPI and ACS Style

Wang, L.; Wang, Y.; Wang, X.; Feng, X.; Ye, X.; Fu, J. Small-Sized Mg–Al LDH Nanosheets Supported on Silica Aerogel with Large Pore Channels: Textural Properties and Basic Catalytic Performance after Activation. Nanomaterials 2018, 8, 113.

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