Preparation of Mesoporous Basic Mixed Metal Oxides through Assembly of Monodispersed Mg-Al Layered Double Hydroxide Nanoparticles.

Author(s) Oka, Y.; Kuroda, Y.; Matsuno, T.; Kamata, K.; Wada, H.; Shimojima, A.; Kuroda, K.
Journal Chemistry
Date Published 2017 May 17

Mesoporous basic Mg-Al mixed metal oxides (MMOs) with a high surface area and large pore size were prepared through the assembly of monodispersed layered double hydroxide nanoparticles (LDHNPs) with block copolymer templates. The particle sizes of the LDHNPs were controlled mainly by varying the concentration of tris(hydroxymethyl)aminomethane (THAM), which was used as a surface stabilizing agent for the LDHNPs. LDHNPs and micelles of a block copolymer (Pluronic F127) were assembled to form a composite. The composites were calcined to transform them into mesoporous MMOs and remove the templates. The Brunauer-Emmett-Teller surface areas, mesopore sizes, and pore volumes increased as a result of using the templates. Moreover, the pore sizes of the mesoporous MMOs were controlled by using LDHNPs with different sizes. The mesoporous MMOs prepared from the LDHNPs showed much higher catalytic activity than a conventional MMO catalyst for the Knövenagel condensation of ethyl cyanoacetate with benzaldehyde. The mesoporous MMO catalyst prepared using the smallest LDHNPs, ca. 12 nm in size, showed the highest activity. Therefore, the use of monodispersed LDHNPs and templates is effective for preparing highly active mesoporous solid base catalysts.

DOI 10.1002/chem.201701282
ISSN 1521-3765
Citation Chemistry. 2017.

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