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Journal of Sol-Gel Science and Technology

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15.03.2019 | Original Paper: Sol–gel, hybrids and solution chemistries

Synthesis of aluminophosphate xerogels by non-hydrolytic sol–gel condensation of EtAlCl₂ with trialkylphosphates

verfasst von: Jan Podhorsky, Jan Chyba, Jiri Pinkas, Zdenek Moravec

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 2/2019

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Abstract

We have investigated the preparation of high-surface-area mesoporous aluminophosphates by non-hydrolytic sol–gel method based on reactions of EtAlCl₂ with trialkylesters of phosphoric acid (OP(OR)₃, R = Me, Et, ⁱPr, ⁿBu, in dry organic solvents. The condensations proceed by alkylchloride elimination. Various reaction and calcination conditions were examined. Porosity is obtained after calcination by removal of organic residual groups. This thermal processing at 300 °C of as-synthesized precursor gels leads to amorphous aluminophosphate xerogels with surface areas of 400–500 m² g^–1 provided by small mesopores (2–8 nm). Changes in the coordination environment of aluminium from six- to four-coordinate are evidenced by shift of ²⁷Al MAS NMR resonances.

Vorheriger Artikel Amine functionalized mesoporous hybrid materials: influence of KCl and xylene on the textural characteristics and CO2 sorption

Nächster Artikel 2-Triethoxysilylazulene derivatives: Syntheses and optical properties, and hydrolysis—condensation of 2-triethoxysilylazulene

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Titel: Synthesis of aluminophosphate xerogels by non-hydrolytic sol–gel condensation of EtAlCl2 with trialkylphosphates
verfasst von: Jan Podhorsky
Jan Chyba
Jiri Pinkas
Zdenek Moravec
Publikationsdatum: 15.03.2019
Verlag: Springer US
Erschienen in: Journal of Sol-Gel Science and Technology / Ausgabe 2/2019
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI: https://doi.org/10.1007/s10971-019-04953-0

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