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AssigneeCentre National de la Recherche Scientifique (CNRS)
InventorsDamien Meunier, Arnaud Piechaczyk, Aimery De Mallman, Jean-Marie Basset
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The invention concerns recyclable solid oxidation catalysts comprising a metal compound of a pentavalent or hexavalent metal M and selected among the group consisting of tantalum, vanadium, niobium, chromium, molybdenum, tungsten, grafted at the surface of a solid oxide with at least one, preferably one, covalent bond between an oxygen atom of the solid oxide and the metal M atom, the grafted metal compound having at least two alkoxy groups bound to the metal by the oxygen atom. Preferably, at least 2 alkoxy groups bound to the metal M belong to a polyol unit, preferably diol. The invention also concerns oxidation methods, in particular epoxidation methods using same.
A solid oxidation catalyst comprising a metal compound of a pentavalent or hexavalent metal M, selected from the group consisting of tantalum, vanadium, niobium, chromium, molybdenum and tungsten, grafted to the surface of a solid oxide by at least one covalent bond between an oxygen atom of the solid oxide and the metal atom M, the grafted metal compound exhibiting at least two alkoxy groups bonded to the metal via an oxygen atom, with said at least two alkoxy groups bonded to the metal M belonging to a chiral polyol unit.
A process for the preparation of a solid oxidation catalyst, comprising bringing into contact a chiral polyol and a catalyst precursor made of solid oxide comprising a metal compound of a pentavalent or hexavalent metal M, selected from the group consisting of tantalum, vanadium, niobium, chromium, molybdenum and tungsten, grafted to the surface of a solid oxide by at least one covalent bond between an oxygen atom of the solid oxide and the metal atom M, the grafted metal compound comprising at least two alkoxy groups, and exchanging at least two alkoxy groups of the grafted metal compound with the polyol.
Dependencies are inferred from the claim text.