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

doi:10.1016/S0167-2991(06)81744-1

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

Inorganic Materials & Catalysis

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

4 Citations (Scopus)

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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 language	English
Title of host publication	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
Editors	G. Poncelet, J. Martens, B. Delmon
Place of Publication	Amsterdam
Publisher	Elsevier
Pages	33-48
Number of pages	16
ISBN (Print)	0-444-82078-7
DOIs	https://doi.org/10.1016/S0167-2991(06)81744-1
Publication status	Published - 1995
Event	conference; 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 Sept 1995 → 8 Sept 1995

Publication series

Name	Studies in Surface Science and Catalysis
Volume	91
ISSN (Print)	0167-2991

Conference

Conference	conference; 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
Period	5/09/95 → 8/09/95
Other	International Symposium on the Scientific Bases for the Preparation of Heterogeneous Catalysts ; 6 (Louvain-La-Neuve) : 1994.09.05-08

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10.1016/S0167-2991(06)81744-1

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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). Elsevier. https://doi.org/10.1016/S0167-2991(06)81744-1

Beelen, T.P.M. ; Dokter, W.H. ; Garderen, van, H.F. et al. / The role of aging on the formation of porous silica. 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. editor / G. Poncelet ; J. Martens ; B. Delmon. Amsterdam : Elsevier, 1995. pp. 33-48 (Studies in Surface Science and Catalysis).

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title = "The role of aging on the formation of porous silica",

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.",

author = "T.P.M. Beelen and W.H. Dokter and {Garderen, van}, H.F. and {Santen, van}, R.A. and E. Pantos",

year = "1995",

doi = "10.1016/S0167-2991(06)81744-1",

language = "English",

isbn = "0-444-82078-7",

series = "Studies in Surface Science and Catalysis",

publisher = "Elsevier",

pages = "33--48",

editor = "G. Poncelet and J. Martens and B. Delmon",

booktitle = "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",

address = "Netherlands",

note = "conference; 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 ; Conference date: 05-09-1995 Through 08-09-1995",

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Beelen, TPM, Dokter, WH, Garderen, van, HF, Santen, van, RA & 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. Studies in Surface Science and Catalysis, vol. 91, Elsevier, Amsterdam, pp. 33-48, conference; 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, 5/09/95. https://doi.org/10.1016/S0167-2991(06)81744-1

The role of aging on the formation of porous silica. / Beelen, T.P.M.; Dokter, W.H.; Garderen, van, H.F. et al.
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. ed. / G. Poncelet; J. Martens; B. Delmon. Amsterdam: Elsevier, 1995. p. 33-48 (Studies in Surface Science and Catalysis; Vol. 91).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

TY - GEN

T1 - The role of aging on the formation of porous silica

AU - Beelen, T.P.M.

AU - Dokter, W.H.

AU - Garderen, van, H.F.

AU - Santen, van, R.A.

AU - Pantos, E.

PY - 1995

Y1 - 1995

N2 - 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.

AB - 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.

U2 - 10.1016/S0167-2991(06)81744-1

DO - 10.1016/S0167-2991(06)81744-1

M3 - Conference contribution

SN - 0-444-82078-7

T3 - Studies in Surface Science and Catalysis

SP - 33

EP - 48

BT - 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

A2 - Poncelet, G.

A2 - Martens, J.

A2 - Delmon, B.

PB - Elsevier

CY - Amsterdam

T2 - conference; 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

Y2 - 5 September 1995 through 8 September 1995

ER -

Beelen TPM, Dokter WH, Garderen, van HF, Santen, van RA, Pantos E. The role of aging on the formation of porous silica. In Poncelet G, Martens J, Delmon B, editors, 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. Amsterdam: Elsevier. 1995. p. 33-48. (Studies in Surface Science and Catalysis). doi: 10.1016/S0167-2991(06)81744-1

The role of aging on the formation of porous silica

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