Publication details

Surface modification of phosphosilicate gels: Control of composition, porosity, acidity, and hydrophobicity

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Year of publication 2012
Type Conference abstract
MU Faculty or unit

Central European Institute of Technology

Description We developed a non-hydrolytic sol-gel synthesis of phosphosilicate gels and hybrid organic-inorganic materials from silicon acetates and trimethylsilyl phosphates and. The inorganic microporous SiOP frameworks with residual surface organic groups was built in a polycondensation reactions within the elimination of acetic acid ester. Herein we report chemical modification reactions of residual acetoxy and trimethylsilyloxy groups by variety of compounds (SiCl4, POCl3, RSiCl3, AlX3, ROH, Me3SiOSiMe3). Our aim was to show the versatility of the primarily synthesized phosphosilicate xerogels in tuning their properties. As an example, the phosphosilicate gels can be modified by alcohols to form Brônsted acidic POH groups on one hand and by aluminum compounds to form Lewis acidic four-coordinated Al atoms on the other hand. The obtained materials and by-products were characterized by liquid and solid-state NMR, IR, BET and elemental analyses.
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