Facile synthesis of ordered mesoporous alumina and alumina-supported metal oxides with tailored adsorption and framework properties

Cai, Weiquan, Yu, Jiaguo, Anand, Chokkalingam, Vinu, Ajayan and Jaroniec, Mietek (2011) Facile synthesis of ordered mesoporous alumina and alumina-supported metal oxides with tailored adsorption and framework properties. Chemistry of Materials, 23 5: 1147-1157. doi:10.1021/cm102512v


Author Cai, Weiquan
Yu, Jiaguo
Anand, Chokkalingam
Vinu, Ajayan
Jaroniec, Mietek
Title Facile synthesis of ordered mesoporous alumina and alumina-supported metal oxides with tailored adsorption and framework properties
Journal name Chemistry of Materials   Check publisher's open access policy
ISSN 0897-4756
1520-5002
Publication date 2011-03-01
Sub-type Article (original research)
DOI 10.1021/cm102512v
Volume 23
Issue 5
Start page 1147
End page 1157
Total pages 11
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Formatted abstract
The evaporation-induced self-assembly (EISA) in ethanolic solution of a triblock copolymer (Pluronic P123) is explored for the synthesis of ordered mesoporous alumina (MA) and MA-supported metal oxides, using aluminum isopropoxide, aluminum chloride, and aluminum nitrate nonahydrate as aluminum precursors, and nickel, magnesium, iron, chromium, copper, cerium, lanthanum, yttrium, calcium, tin chlorides, or nitrates as metal precursors. The as-synthesized mesoporous oxides were characterized by a variety of techniques, such as thermogravimetry, Fourier transform infrared spectroscopy, nitrogen adsorption, small- and wide-angle X-ray diffraction, high-resolution transmission electron microscopy, energy-dispersive X-ray spectrometry, elemental mapping, and CO2 and NH3 temperature-programmed desorption. It is shown that the EISA strategy in the presence of polymeric template not only is well-suited for the synthesis of ordered MAs and MA-supported metal oxides with tailored adsorption and framework properties, but also ensures a homogeneous distribution of metal species within inorganic framework with the aluminum/metal atomic ratio close to this used in the synthesis mixture. The aluminum and other metal precursors used in EISA have a significant impact on the pore structure, surface area, and basic and acidic properties of the resulting mixed oxides. For instance, the use of inexpensive aluminum nitrate nonahydrate in the synthesis leads to the significantly enlarged mesopores (ranging from 7 nm to 16 nm), improved ordering of the oxides, and enhanced adsorption affinity toward CO2, while the aluminum chloride precursor affords MA-supported metal oxides with a bimodal pore size distribution, with peaks located in the ranges of 2−4 nm and 5−9 nm, respectively. It is also shown that the use of inexpensive aluminum and metal salts as precursors instead of aluminum alkoxides affords MA-supported metal oxides with tailorable properties, in terms of the surface area, porosity, and surface basicity and acidity, which determine the performance of these materials in various applications, including adsorption and catalysis.
Keyword Porous materials
Self-assembled materials
Mesoporous alumina
Mixed metal oxides
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Australian Institute for Bioengineering and Nanotechnology Publications
 
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