Silica-Pillared Clay Derivatives Using Aminopropyltriethoxysilane View Full Text


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Article Info

DATE

2000-06

AUTHORS

J. Ahenach, P. Cool, R.E.N. Impens, E.F. Vansant

ABSTRACT

Silica pillared montmorillonite has been synthesized using aminopropyltriethoxysilane (APTS), the organic part of which is removed upon calcination. A good intercalation has been established as determined by X-ray diffraction, thermogravimetric analysis and fourier-transform infrared measurements. The concentration of the APTS solution has an influence on the density of the pillars in the interlayer space. In case of enhanced APTS concentration, a material with lower surface area and pore volume is obtained, due to the clay interlayer space being completely occupied by silica pillars. Therefore a templated synthesis method is applied in order to reduce the density of the pillars between the clay sheets. By a pre-intercalation of the clay with cetyltrimethylammonium ions prior to the modification with APTS, the clay sheets are driven apart allowing a more easy intercalation of the APTS molecules. Analysis results show an increase in interlayer free spacing (IFS) to a value of 7.4 Å probably due to the insertion of two layers of silica (—Si—O—Si—) between the clay sheets. A maximal surface area of 252 m2/g and a micropore volume of 0.072 cc/g can be obtained in case of the templated synthesis method. More... »

PAGES

475-481

References to SciGraph publications

  • 1980-04. Intercalation of Silica in Smectite in CLAYS AND CLAY MINERALS
  • Identifiers

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    http://scigraph.springernature.com/pub.10.1023/a:1009622726829

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    http://dx.doi.org/10.1023/a:1009622726829

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