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Theses

CATALYSEURS A BASE DE COMPLEXES DE PLATINE INCORPORES DANS LES MURS DE SILICES MESOPOREUSES PERIODIQUES ; REACTIVITE EN HYDROGENATION

Abstract : The present work extends the synthesis concept of periodic mesoporous organosilicas to the incorporation of molecular platinum complexes able to catalyse hydrogenation reactions. These new materials are fully characterised from the structural as well as the metal complex point of view. Their properties are compared to those of a classically functionalised (post-synthesis grafting) SBA-15 type silica. We have proven that the metal complex is indeed embedded inside the mesostructured walls of the new materials, with retention of the coordination structure around the platinum atoms, whereas the complex is situated at the wall surface in the case of the reference material. Both solids are active in hydrogenating styrene to éthylbenzène at 40 bars and 80°C if 1 equivalent of SnCl2 cocatalyst is added. Pre-synthesising the Pt-Sn system within the platinum containing materials was attempted. Although the catalytic activity of the resulting solids is similar to the in-situ generated system, we have found that SnCl2 does not exclusively insert into Pt-Cl bonds but also interacts strongly with the surfaces.
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https://tel.archives-ouvertes.fr/tel-00189044
Contributor : Nicolas Crowther <>
Submitted on : Tuesday, January 15, 2008 - 2:49:50 PM
Last modification on : Wednesday, November 20, 2019 - 3:02:09 AM
Long-term archiving on: : Tuesday, September 21, 2010 - 3:11:30 PM

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  • HAL Id : tel-00189044, version 2

Citation

Nicolas Crowther. CATALYSEURS A BASE DE COMPLEXES DE PLATINE INCORPORES DANS LES MURS DE SILICES MESOPOREUSES PERIODIQUES ; REACTIVITE EN HYDROGENATION. Matériaux. Ecole normale supérieure de lyon - ENS LYON, 2007. Français. ⟨tel-00189044v2⟩

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