Microporous solids from SiO sub 2 -Al sub 2 O sub 3

One of the main technological interests of the sol-gel process is related to the preparation of amorphous solids at low temperature. Polymeric Si-Al sols were prepared from Al(OBu exp s ) sub 3 and Si(OEt) sub 4 (TEOS). Acetylacetone and isoeugenol were employed separately to chelate the Al precurso...

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Bibliographic Details
Published in:International journal of polymeric materials 2002-06, Vol.51 (6), p.547-556
Main Authors: Mendoza-Serna, R, Loyo-Arnaud, E, Roquero-Garcia, C E, Rosas-Cedillo, R, Moreno-Rodriguez, J A
Format: Article
Language:English
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Summary:One of the main technological interests of the sol-gel process is related to the preparation of amorphous solids at low temperature. Polymeric Si-Al sols were prepared from Al(OBu exp s ) sub 3 and Si(OEt) sub 4 (TEOS). Acetylacetone and isoeugenol were employed separately to chelate the Al precursor in order to slow down the chemical reactivity, avoiding precipitation. The characterization techniques were Fourier Transform Infrared Spectroscopy (FTIR), nitrogen sorption measurements, Thermal Gravimetric (TGA) and Differential Thermal Analyses (DTA). The Si-O-Al bond vibration was detected by FTIR in the 1056-1074cm exp -1 region. From the N sub 2 adsorption, isotherms the surface area results obtained range between 15.8 to 408.4 m exp 2 /g. Corresponding average pore diameter are 3.397 to 1.417 nm. It is found that the porous texture of the materials mainly depends to the chelating agent in the sols. A strong influence of the molecular structure of the chelating agents in the sols was observed in the oxides by TGA and DTA studies.
ISSN:0091-4037