Hostname: page-component-78c5997874-4rdpn Total loading time: 0 Render date: 2024-11-06T02:06:47.208Z Has data issue: false hasContentIssue false
  • English
  • Français

Formation of Phyllosilicates and Zeolites from Pure Silica-Alumina Gels

Published online by Cambridge University Press:  01 July 2024

C. R. De Kimpe
C. R. De Kimpe*
Affiliation:
Agriculture Canada, Research Station, 2560 Chemin Gomin, Ste-Foy, Quebec, G1V 2J3, Canada
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The hydrothermal aging of pure silica—alumina gels in presence of 10 ml of 0.1 N sodium hydroxide solution at 175, 150 and 130°C for 8–30 days led to the synthesis of zeolites and the phyllosilicates, beidellite and kaolinite. The solution was neutralized by a partial hydrolysis of the gel which readily reorganized into a prezeolitic material. At pH values ⩾ 9, with 300 or 600 mg of gel, it evolved towards the crystalline zeolites P and S, with low surface area (7–100 m2/g) but high exchange capacity (300–475 m-equiv./100 g). With gel amounts of 600–2400 mg, and pH values of 8–5.5, the prezeolitic material provided rows of O—Si—O—Al—OH which recombined to form the phyllosilicate structures. Surface area increased (170–325 m2/g) but exchange capacity decreased (100–250m-equiv./100 g). The results obtained by various techniques (XRD, DTA, IR) indicated a moderate degree of crystallinity of these phyllosilicates; in addition, X-ray powder diffraction suggested that hk bands were the first to develop.

The positive results obtained with a 0.40 ratio Al2O3 gel compared with the negative results obtained with 0.30 or 0.50 Al2O3 gels indicate that the gel composition is very important for the formation of phyllosilicates under the experimental conditions.

Type
Research Article
Information
Clays and Clay Minerals , Volume 24 , Issue 4 , August 1976 , pp. 200 - 207
Copyright
Copyright © 1976 The Clay Minerals Society

Footnotes

Contribution No. 79.

References

Barrer, R. M., Baynham, J. W., Bultitude, F. W. and Meier, W. M. (1959) Hydrothermal chemistry of the silicates—VIII: Low-temperature crystal growth of alumino-silicates, and of some gallium and germanium analogues: J. Chem. Soc. 1, 195–208.CrossRefGoogle Scholar
Breck, D. W. (1974) Zeolite Molecular Sieves, 771 pp. Wiley, New York.Google Scholar
Cloos, P., Leonard, A. J., Moreau, J. P., Herbillon, A. and Fripiat, J. J. (1969) Structural organization in amorphous silico–aluminas: Clays & Clay Minerals 17, 279–287.CrossRefGoogle Scholar
De Kimpe, C. R., Gastuche, M. C. and Brindley, G. W. (1964) Low temperature syntheses of kaolin minerals: Am. Miner. 49, 1–16.Google Scholar
De Kimpe, C. R. (1967) Hydrothermal aging of synthetic aluminosilicate gels: Clay Minerals 7, 203–214.CrossRefGoogle Scholar
De Kimpe, C. R. and Fripiat, J. J. (1968) Kaolinite crystallization from H-exchanged zeolites: Am. Miner. 53, 216–230.Google Scholar
De Kimpe, C. R. (1969) Crystallization of kaolinite at low temperature from an alumino–silicic gel: Clays & Clay Minerals 17, 37–38.CrossRefGoogle Scholar
Grubb, P. L. C. (1969) Phase changes in aged sesquioxide gels and some analogies with katamorphic processes: Mineral. Deposita, Berlin 4, 30–51.Google Scholar
Leonard, A., Suzuki, S., Fripiat, J. J. and De Kimpe, C. R. (1964) Structure and properties of amorphous silico aluminas—I: Structure from X-ray fluorescence spectroscopy and i.r. spectroscopy: J. Phys. Chem. 68, 2608–2617.CrossRefGoogle Scholar
Linares, J. and Huertas, F. (1971) Kaolinite: synthesis at room temperature: Science 171, 896–897.CrossRefGoogle ScholarPubMed
Milkey, R. G. (1960) I.r. spectra of some tectosilicates: Am. Miner. 45, 990.Google Scholar
Nelsen, F. M. and Eggertsen, F. T. (1958) Determination of surface area adsorption measurements by a continuous flow method: Anal. Chem. 30, 1387–1388.CrossRefGoogle Scholar
Oberlin, A. and Couty, R. (1970) Conditions of kaolinite formation during alteration of some silicates by water at 200°C: Clays & Clay Minerals 18, 347–356.CrossRefGoogle Scholar
Poncelet, G. and Brindley, G. W. (1967) Experimental formation of kaolinite from montmorillonite at low temperature: Am. Miner. 52, 1161–1173.Google Scholar
Rodrique, L., Poncelet, G. and Herbillon, A. (1973) Importance of the silica substraction process during the hydrothermal kaolinization of amorphous silico–aluminas: Proc. Int. Clay Conf., Madrid, 1972 pp. 187–198.Google Scholar
Van Reeuwyk, L. P. (1974) The thermal dehydration of natural zeolites. Meded. Landbouwhogeschool Wageningen, Holland. No. 9, 1–88.Google Scholar
Wey, R. and Siffert, B. (1962) Réactions de la silice monomoléculaire en solution avec les ions Al3+ et Mg2+. Coll. CNRS “Genèse et Synthèse des Argiles” Paris, 1961. Pp. 11–23.Google Scholar