Abstract
Homogeneously mixed mesoporous VOx/MgO aerogels with vanadium concentrations ranging up to 26 wt.% with the surface area as high as 1200 m2/g were synthesized by hydrolysis of a mixture of vanadium and magnesium alkoxides followed by gelation and high-temperature supercritical drying. Dehydration conditions were optimized to obtain nanocrystalline VO x/MgO oxides with the surface area exceeding 450 m2/g after calcination at 550 °C. The synthesized aerogels were extensively characterized by physicochemical methods (XRD, NMR, HRTEM, EDX). According to the EDX data, vanadium atoms were very uniformly distributed in the MgO structure of the mixed oxide aerogels. No magnesium vanadate phases were observed by XRD in the samples with the vanadium concentrations 26% or lower. As the vanadium concentration increased, vanadium ions were introduced into the MgO nanocrystals changing their symmetry from the initial cubic (Fm3 m) to orthorhombic (Cmca). Simulation of the XRD patterns of as-prepared aerogels suggests that the Mg(OH)2 phase in these samples is substantially distorted due to the presence of methoxide groups between the layers.
| Original language | English |
|---|---|
| Pages (from-to) | 32-40 |
| Number of pages | 9 |
| Journal | Microporous and Mesoporous Materials |
| Volume | 160 |
| DOIs | |
| Publication status | Published - 15 Sep 2012 |
| Externally published | Yes |
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Keywords
- Aerogels
- Nanocrystals
- VO/MgO
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Chemistry(all)
- Condensed Matter Physics
Cite this
Synthesis and characterization of mesoporous VOx/MgO aerogels with high surface area. / Ilyina, Ekaterina V.; Mishakov, Ilya V.; Vedyagin, Aleksey A.; Cherepanova, Svetlana V.; Nadeev, Alexander N.; Bedilo, Alexander F.; Klabunde, Kenneth J.
In: Microporous and Mesoporous Materials, Vol. 160, 15.09.2012, p. 32-40.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Synthesis and characterization of mesoporous VOx/MgO aerogels with high surface area
AU - Ilyina, Ekaterina V.
AU - Mishakov, Ilya V.
AU - Vedyagin, Aleksey A.
AU - Cherepanova, Svetlana V.
AU - Nadeev, Alexander N.
AU - Bedilo, Alexander F.
AU - Klabunde, Kenneth J.
PY - 2012/9/15
Y1 - 2012/9/15
N2 - Homogeneously mixed mesoporous VOx/MgO aerogels with vanadium concentrations ranging up to 26 wt.% with the surface area as high as 1200 m2/g were synthesized by hydrolysis of a mixture of vanadium and magnesium alkoxides followed by gelation and high-temperature supercritical drying. Dehydration conditions were optimized to obtain nanocrystalline VO x/MgO oxides with the surface area exceeding 450 m2/g after calcination at 550 °C. The synthesized aerogels were extensively characterized by physicochemical methods (XRD, NMR, HRTEM, EDX). According to the EDX data, vanadium atoms were very uniformly distributed in the MgO structure of the mixed oxide aerogels. No magnesium vanadate phases were observed by XRD in the samples with the vanadium concentrations 26% or lower. As the vanadium concentration increased, vanadium ions were introduced into the MgO nanocrystals changing their symmetry from the initial cubic (Fm3 m) to orthorhombic (Cmca). Simulation of the XRD patterns of as-prepared aerogels suggests that the Mg(OH)2 phase in these samples is substantially distorted due to the presence of methoxide groups between the layers.
AB - Homogeneously mixed mesoporous VOx/MgO aerogels with vanadium concentrations ranging up to 26 wt.% with the surface area as high as 1200 m2/g were synthesized by hydrolysis of a mixture of vanadium and magnesium alkoxides followed by gelation and high-temperature supercritical drying. Dehydration conditions were optimized to obtain nanocrystalline VO x/MgO oxides with the surface area exceeding 450 m2/g after calcination at 550 °C. The synthesized aerogels were extensively characterized by physicochemical methods (XRD, NMR, HRTEM, EDX). According to the EDX data, vanadium atoms were very uniformly distributed in the MgO structure of the mixed oxide aerogels. No magnesium vanadate phases were observed by XRD in the samples with the vanadium concentrations 26% or lower. As the vanadium concentration increased, vanadium ions were introduced into the MgO nanocrystals changing their symmetry from the initial cubic (Fm3 m) to orthorhombic (Cmca). Simulation of the XRD patterns of as-prepared aerogels suggests that the Mg(OH)2 phase in these samples is substantially distorted due to the presence of methoxide groups between the layers.
KW - Aerogels
KW - Nanocrystals
KW - VO/MgO
UR - http://www.scopus.com/inward/record.url?scp=84861408935&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84861408935&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2012.04.016
DO - 10.1016/j.micromeso.2012.04.016
M3 - Article
VL - 160
SP - 32
EP - 40
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
ER -