Design of hierarchical functional porous mixed oxides from single precursors

Research output: Contribution in Book/Catalog/Report/Conference proceedingChapter

Abstract

Porous materials have been prepared via a single-source pathway. A one-step synthesis pathway has been developed for the design of hierarchically structured macro-mesoporous aluminosilicates with high tetrahedral aluminium content from a single molecular alkoxide precursor already containing Si-O-Al bonds (sec-BuO) -Al-O-Si(OEt) . The compensation of the cleavage of the intrinsic Al-O-Si linkage is successfully achieved by using highly alkaline media and the employment of reactive silica co-reactants, or aluminium selective chelating agents, leading to aluminosilicate materials with Si/Al ratios close to one and very high proportion of tetrahedral aluminium species. The macro-mesoporosity was spontaneously generated by the hydrodynamic flow of solvents released during the rapid hydrolysis and condensation processes of this double alkoxide. Secondly, recent advances in the conception of mesoporous zirconosilicate with homogeneous repartition of zirconium into the silicate structure (Si/Zr ∼ 4), achieved by the use of Zr[OSi(O Bu) ] molecular precursor, are presented.
Original languageEnglish
Title of host publicationStudies in Surface Science and Catalysis
Pages185-192
Number of pages8
Volume175
DOIs
Publication statusPublished - 1 Jan 2010

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Aluminum
Oxides
Macros
Silicates
Chelating Agents
Silicon Dioxide
Porous materials
Condensation
Hydrolysis
Hydrodynamics
aluminosilicate

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Lemaire, A. ; Su, B.-L. / Design of hierarchical functional porous mixed oxides from single precursors. Studies in Surface Science and Catalysis. Vol. 175 2010. pp. 185-192
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Design of hierarchical functional porous mixed oxides from single precursors. / Lemaire, A.; Su, B.-L.

Studies in Surface Science and Catalysis. Vol. 175 2010. p. 185-192.

Research output: Contribution in Book/Catalog/Report/Conference proceedingChapter

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AB - Porous materials have been prepared via a single-source pathway. A one-step synthesis pathway has been developed for the design of hierarchically structured macro-mesoporous aluminosilicates with high tetrahedral aluminium content from a single molecular alkoxide precursor already containing Si-O-Al bonds (sec-BuO) -Al-O-Si(OEt) . The compensation of the cleavage of the intrinsic Al-O-Si linkage is successfully achieved by using highly alkaline media and the employment of reactive silica co-reactants, or aluminium selective chelating agents, leading to aluminosilicate materials with Si/Al ratios close to one and very high proportion of tetrahedral aluminium species. The macro-mesoporosity was spontaneously generated by the hydrodynamic flow of solvents released during the rapid hydrolysis and condensation processes of this double alkoxide. Secondly, recent advances in the conception of mesoporous zirconosilicate with homogeneous repartition of zirconium into the silicate structure (Si/Zr ∼ 4), achieved by the use of Zr[OSi(O Bu) ] molecular precursor, are presented.

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