TY - JOUR
T1 - Preparation of Mesoporous Basic Oxides through Assembly of Monodispersed Mg–Al Layered Double Hydroxide Nanoparticles
AU - Oka, Yuya
AU - Kuroda, Yoshiyuki
AU - Matsuno, Takamichi
AU - Kamata, Keigo
AU - Wada, Hiroaki
AU - Shimojima, Atsushi
AU - Kuroda, Kazuyuki
N1 - Funding Information:
We thank Mr. Jun′ichi Saito (Environmental Safety Center, Waseda University) and Dr. Tasuku Komanoya (Tokyo Institute of Technology) for their kind help with the catalytic experiments, Mr. Yuya Inamori (Waseda University) and Mr. Tatsuyuki Koichi (Waseda University) for their kind assistance with the NMR analyses, and Mr. Keisuke Muramatsu (Waseda University) and Ms. Shiori Hayashi (Waseda University) for their experimental assistance. This work was supported in part by Grants-in-Aid for Scientific Research (Nos. 26810118 and 26248060), and by the Collaborative Research Project of Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology.
Publisher Copyright:
© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2017/7/12
Y1 - 2017/7/12
N2 - Mesoporous basic Mg–Al mixed metal oxides (MMOs) with a high surface area and large pore size have been prepared through the assembly of monodispersed layered double hydroxide nanoparticles (LDHNPs) with block copolymer templates. The particle sizes of the LDHNPs were mainly controlled by varying the concentration of tris(hydroxymethyl)aminomethane (THAM), which was used as a surface stabilizing agent. 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 to 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 could be controlled by using LDHNPs of 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, about 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.
AB - Mesoporous basic Mg–Al mixed metal oxides (MMOs) with a high surface area and large pore size have been prepared through the assembly of monodispersed layered double hydroxide nanoparticles (LDHNPs) with block copolymer templates. The particle sizes of the LDHNPs were mainly controlled by varying the concentration of tris(hydroxymethyl)aminomethane (THAM), which was used as a surface stabilizing agent. 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 to 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 could be controlled by using LDHNPs of 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, about 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.
KW - layered double hydroxides
KW - mesoporous materials
KW - mixed metal oxides
KW - solid base catalyst
KW - tripodal ligands
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U2 - 10.1002/chem.201701282
DO - 10.1002/chem.201701282
M3 - Article
C2 - 28514015
AN - SCOPUS:85021299002
VL - 23
SP - 9362
EP - 9368
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
SN - 0947-6539
IS - 39
ER -