Please use this identifier to cite or link to this item: doi:10.22028/D291-24155
Title: Anomalia na àrea superficial de géis de composição sílica/alumina
Other Titles: Anomaly in the BET surface area of gels of silica/alumina composition
Author(s): Bozano, Dorotéia F.
Ito, J. M.
Bonardi, C.
Aegerter, Michel A.
Language: (Other)
Year of Publication: 1991
OPUS Source: Anais do XXXV Congresso Brasileiro de Cerâmica e III Iberoamericano de Cerámica, Vidrios y Refractarios : 26 a 29 de maio 1991, Belo Horizonte, MG. - São Paulo, Brasil : Associação Brasileira de Cerâmica, 1991, S. 185-192
SWD key words: Aufbereitung
Biologischer Expositionstest
Reduktion <Chemie>
DDC notations: 500 Science
Publikation type: Conference Paper
Abstract: -
The behavior of the BET surface area of gels of SiO2/Al2O3 compositions is studied for different methods of sols preparation: mixture of Si and Al alkoxide with slow or rapid hydrolysis and mixture of Si alkoxide with an Al salt with a rapid hydrolysis. The last method leads to a reduction of the BET surface area for a composition having ~47 wt % Al2O3. This reduction depends on the molar ratio H2O/Si alkoxide and reaches 2 orders of magnitude for a molar ratio of 100. We show that this particular behavior depends on the nature of the precursors, the method of preparation and the H2O/Si alkoxide molar ratio. The real cause of the anomaly is, however, not known.
Link to this record: urn:nbn:de:bsz:291-scidok-23095
Date of registration: 24-Aug-2009
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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