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.
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Ahenach, J., Cool, P., Impens, R. et al. Silica-Pillared Clay Derivatives Using Aminopropyltriethoxysilane. Journal of Porous Materials 7, 475–481 (2000). https://doi.org/10.1023/A:1009622726829
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DOI: https://doi.org/10.1023/A:1009622726829