Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 9362-9368 |
| Number of pages | 7 |
| Journal | Chemistry - A European Journal |
| Volume | 23 |
| Issue number | 39 |
| DOIs | |
| Publication status | Published - 2017 Jul 12 |
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Keywords
- layered double hydroxides
- mesoporous materials
- mixed metal oxides
- solid base catalyst
- tripodal ligands
ASJC Scopus subject areas
- Chemistry(all)
Cite this
Preparation of Mesoporous Basic Oxides through Assembly of Monodispersed Mg–Al Layered Double Hydroxide Nanoparticles. / Oka, Yuya; Kuroda, Yoshiyuki; Matsuno, Takamichi; Kamata, Keigo; Wada, Hiroaki; Shimojima, Atsushi; Kuroda, Kazuyuki.
In: Chemistry - A European Journal, Vol. 23, No. 39, 12.07.2017, p. 9362-9368.Research output: Contribution to journal › Article
}
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
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
UR - http://www.scopus.com/inward/record.url?scp=85021299002&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85021299002&partnerID=8YFLogxK
U2 - 10.1002/chem.201701282
DO - 10.1002/chem.201701282
M3 - Article
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 -