An optimized procedure for the synthesis of AISBA-15 with large pore diameter and high aluminum content

Vinu, A., Murugesan, V., Bohlmann, Winifried and Hartmann, Martin (2004) An optimized procedure for the synthesis of AISBA-15 with large pore diameter and high aluminum content. Journal of Physical Chemistry B, 108 31: 11496-11505. doi:10.1021/jp048411f


Author Vinu, A.
Murugesan, V.
Bohlmann, Winifried
Hartmann, Martin
Title An optimized procedure for the synthesis of AISBA-15 with large pore diameter and high aluminum content
Journal name Journal of Physical Chemistry B   Check publisher's open access policy
ISSN 1520-6106
1520-5207
Publication date 2004-08-01
Sub-type Article (original research)
DOI 10.1021/jp048411f
Open Access Status Not Open Access
Volume 108
Issue 31
Start page 11496
End page 11505
Total pages 10
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Formatted abstract
A series of AlSBA-15 materials with different nSi/nAl ratio have been synthesized by simply adjusting the molar water to hydrochloric acid ratio (nH2O/nHCl). It was possible to control the nSi/nAl ratio, location, and coordination of Al atom in the SBA-15 silica matrix by the above method. Moreover, AlSBA-15 with n Si/nAl ratio up to 7 can be successfully prepared by adjusting the nSi/Al ratio in the synthesis gel at n H2O/nHCl of 276. The effect of the nature of Al source in the AlSBA-15 synthesis has been investigated using different aluminum source, viz., aluminum sulfate, aluminum nitrate, aluminum hydroxide, and aluminum isopropoxide. Aluminum isopropoxide was found to be the good aluminum source for AlSBA-15 material synthesis and enhanced the amount of aluminum incorporation, location, and coordination in the SBA-15 silica walls. The effect of synthesis temperature of AlSBA-15 materials has also been reported. Nitrogen adsorption measurement shows that the pore diameter of AlSBA-15 can be tuned from 9.7 to 12.5 nm by simply adjusting crystallization temperature from 100 to 130°C. The pore volume increases from 1.35 to 1.55 cm3/g with a concomitant decrease of the surface area from 930 to 783 m2/g. For the first time, the mechanical stability of hexagonal AlSBA-15 materials was studied by applying different pelletizing pressures and subsequent characterization by XRD, N2 adsorption, and mercury porosimetry. n-Heptane adsorption isotherms were recorded to evaluate the uptake of organics of the compressed materials. It has been found that mechanical stability of AlSBA-15 is lower compared to that of pure silica SBA-15 materials.
Keyword AlSBA-15
Aluminum isopropoxide
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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