Sol-gel process with a protected catalyst

C - Chemistry – Metallurgy – 03 – C

Patent

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Details

C03C 1/00 (2006.01) C03C 17/00 (2006.01) C04B 41/45 (2006.01)

Patent

CA 2708495

The invention provides a sol-gel process for preparing a mixture of metal - oxide-metal compounds wherein at least one metal oxide precursor is subjected to a hydrolysis treatment to obtain one or more corresponding metal oxide hydroxides, the metal oxide hydroxides so obtained are subjected to a condensation treatment to form the metal-oxide-metal compounds, which process is carried out in the presence of a catalyst which comprises a labile protecting group (P9) and a base (B) which are covalently linked, whereby the covalent link between the protecting group and the base is cleavable by exposure to an external stimulus, and wherein the base released after exposure to such external stimulus is capable of catalyzing the condensation of the metal-hydroxide groups that are present in the metal oxide hydroxides so obtained.

La présente invention concerne un procédé sol-gel de préparation d'un mélange pour composés métal-oxyde-métal, dans lequel au moins un précurseur d'oxyde métallique est soumis à un traitement par hydrolyse en vue de l'obtention d'un ou de plusieurs hydroxydes d'oxyde métallique correspondants, lesdits hydroxydes d'oxyde métallique ainsi obtenus étant ensuite soumis à un traitement par condensation en vue de l'obtention desdits composés métal-oxyde-métal. Ledit procédé est réalisé en présence d'un catalyseur comprenant un groupe protecteur labile (P9) et une base (B) qui sont reliés par une liaison covalente. Ladite liaison covalente entre le groupe protecteur et la base est clivable suite à une exposition à un stimulus extérieur, et ladite base libérée suite à ladite exposition audit stimulus extérieur est capable de catalyser la condensation des groupes métal-hydroxyde présents dans les hydroxydes d'oxyde métallique ainsi obtenus.

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