The role of aging on the formation of porous silica

T.P.M. Beelen, W.H. Dokter, H.F. Garderen, van, R.A. Santen, van, E. Pantos

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Abstract

Porous silica gel has been prepared by acdification of water glass. To study aggregation, gelation andaging use has been made of 29Si-NMR to investigate silica transformations on molecular scale. Qn ratios were used to define distribution of silica in particles and gels. On colloidal scale both 1H relaxation of water and small angle scattering (SAXS, SANS) was very informative, especially because changes in fractal dimension could be used to describe silica transformations during aggregation and aging. Interpretation of fractal dimension in terms of aging mechanisms is performed by computersimulations of both aggregation/aging processes and calculation of the corresponding scattering spectra. Comparison of simulated spectra of aged silica, based on hypothetical aging mechanisms, with experimental spectra emphasized the important role of formation of rings on local scale. In freeze-dried silicas pore distributions were investigated with both neutron scattering (SANS) and physisorption (BET), revealing different pore structures, both in growth and form, after aging at 80°C and aging catalyzed by fluorine.
Original languageEnglish
Title of host publicationPreparation of catalysts VI : scientific bases for the preparation of heterogeneous catalysts ; proceedings of the Sixth International Symposium, Louvain-La-Neuve, September 5 - 8, 1994
EditorsG. Poncelet, J. Martens, B. Delmon
Place of PublicationAmsterdam
PublisherElsevier
Pages33-48
ISBN (Print)0-444-82078-7
DOIs
Publication statusPublished - 1995
Eventconference; International Symposium on the Scientific Bases for the Preparation of Heterogeneous Catalysts ; 6 (Louvain-La-Neuve) : 1994.09.05-08; 1995-09-05; 1995-09-08 -
Duration: 5 Sep 19958 Sep 1995

Publication series

NameStudies in Surface Science and Catalysis
Volume91
ISSN (Print)0167-2991

Conference

Conferenceconference; International Symposium on the Scientific Bases for the Preparation of Heterogeneous Catalysts ; 6 (Louvain-La-Neuve) : 1994.09.05-08; 1995-09-05; 1995-09-08
Period5/09/958/09/95
OtherInternational Symposium on the Scientific Bases for the Preparation of Heterogeneous Catalysts ; 6 (Louvain-La-Neuve) : 1994.09.05-08

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Beelen, T. P. M., Dokter, W. H., Garderen, van, H. F., Santen, van, R. A., & Pantos, E. (1995). The role of aging on the formation of porous silica. In G. Poncelet, J. Martens, & B. Delmon (Eds.), Preparation of catalysts VI : scientific bases for the preparation of heterogeneous catalysts ; proceedings of the Sixth International Symposium, Louvain-La-Neuve, September 5 - 8, 1994 (pp. 33-48). (Studies in Surface Science and Catalysis; Vol. 91). Amsterdam: Elsevier. https://doi.org/10.1016/S0167-2991(06)81744-1