Silicophosphate Gels by Nonhydrolytic Condensation Reactions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14740%2F11%3A00074155" target="_blank" >RIV/00216224:14740/11:00074155 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Silicophosphate Gels by Nonhydrolytic Condensation Reactions

Popis výsledku v původním jazyce

Phosphosilicate gel materials are usually synthesized from aqueous phosphoric acid and silicon alkoxides by hydrolysis. A high hydrolytic instability of the Si-O-P bonds leads to the products that are actually silicagels impregnated by aqueous H3PO4. Their calcination then provides crystalline silicophosphate phases. We prepared phosphosilicate gels by an elimination of acetic acid esters in heterocondensation reactions between Si(OC(O)CH3)4 and OP(OSiMe3)3 in nonaqueous organic solvents. 3 Si(OC(O)CH3)4 + 4 OP(OSiMe3)3 = 12 CH3C(O)OSiMe3 + Si3P4O16 While the ester elimination from metal alkoxides and silicon tetraacetate was reported previously, its application to phosphoric acid esters is new. The nonhydrolytic ester elimination provides clear amorphous phosphosilicate gels at room temperature with a high surface area up to 450 m2 g-1. Trimethylsilylester of acetic acid was identified by NMR and GC/MS as the elimination byproduct.

Název v anglickém jazyce

Silicophosphate Gels by Nonhydrolytic Condensation Reactions

Popis výsledku anglicky

Phosphosilicate gel materials are usually synthesized from aqueous phosphoric acid and silicon alkoxides by hydrolysis. A high hydrolytic instability of the Si-O-P bonds leads to the products that are actually silicagels impregnated by aqueous H3PO4. Their calcination then provides crystalline silicophosphate phases. We prepared phosphosilicate gels by an elimination of acetic acid esters in heterocondensation reactions between Si(OC(O)CH3)4 and OP(OSiMe3)3 in nonaqueous organic solvents. 3 Si(OC(O)CH3)4 + 4 OP(OSiMe3)3 = 12 CH3C(O)OSiMe3 + Si3P4O16 While the ester elimination from metal alkoxides and silicon tetraacetate was reported previously, its application to phosphoric acid esters is new. The nonhydrolytic ester elimination provides clear amorphous phosphosilicate gels at room temperature with a high surface area up to 450 m2 g-1. Trimethylsilylester of acetic acid was identified by NMR and GC/MS as the elimination byproduct.

Druh

O - Ostatní výsledky

CEP obor

CA - Anorganická chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů