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Article Dans Une Revue CROATICA CHEMICA ACTA Année : 2001

Isomorphous Substitution of Framework Atoms by Titanium in VPI-5 Aluminophosphate Molecular Sieve

Résumé

Extra-large pore aluminophosphate molecular sieve TiVPI-5 was synthesised hydrothermally in the presence of din -butylamine and transformed by the calcination process at 500 °C to a large pore TAPO-8. Incorporation of titanium(IV) into VPI-5 framework was studied by elemental and thermogravimetric analyses, combined with X-ray Absorption Near Edge Structure (XANES) spectroscopy and UV-VIS absorption spectroscopy. We found that titanium(IV) incorporated in TiVPI-5 isomorphously substitutes framework aluminium on octahedral sites and that it is not present in the structure in the form of TiO 2 anatase. In situ IR measurements of pyridine adsorption/desorption were used to check the presence of catalytically active centres in the product resulting from titanium incorporation into the VPI-5 framework. Weak Lewis and Brønsted acid sites were found in small amounts in the calcined product TAPO-8.

Domaines

Chimie
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Dates et versions

hal-04300258 , version 1 (22-11-2023)

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  • HAL Id : hal-04300258 , version 1

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Nataša Novak Tušar, Nataša Zabukovec Logar, Iztok Arčon, Frederic Thibault-Starzyk, Venčeslav Kaučič. Isomorphous Substitution of Framework Atoms by Titanium in VPI-5 Aluminophosphate Molecular Sieve. CROATICA CHEMICA ACTA, 2001, 74 (4), pp.837-849. ⟨hal-04300258⟩
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