Process for preparing a group viii-metal containing...

B - Operations – Transporting – 01 – J

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B01J 37/06 (2006.01) B01J 21/08 (2006.01) B01J 23/40 (2006.01) B01J 23/52 (2006.01) B01J 23/58 (2006.01) C07C 67/055 (2006.01) B01J 37/02 (2006.01) B01J 37/03 (2006.01)

Patent

CA 2448322

A process for preparing a catalyst which process comprises the steps of (a) selecting a carrier which is a silica based carrier which has been subjected to a series of washings with one or more aqueous liquids consisting of aqueous liquids which have a pH of least 3, when measured at 20~C, or which is a silica based carrier which is formed from materials one or more of which have been subjected to a said series of washings,(b) precipitating a Group 8 metal compound onto the carrier, (c) converting the precipitated Group 8 metal compound into metallic species, and (d) subjecting the Group 8 metal/carrier composition to a purification treatment, before or after step (c); a catalyst which is obtainable by this process; and a process for preparing an alkenyl carboxylate comprising reacting a mixture comprising an olefin, a carboxylic acid and oxygen in the presence of the catalyst.

L'invention concerne un procédé de préparation d'un catalyseur comprenant les étapes consistant (a) à sélectionner un support lequel est un support à base de silice ayant été soumis à une série de lavages à l'aide d'un ou de plusieurs liquides aqueux constitués de liquides aqueux ayant un pH d'au moins 3, mesurés à 20 ·C, ou lequel est un support à base de silice formé à partir de matières dont une ou plusieurs a été soumise à ladite série de lavages, (b) à précipiter un composé métallique du groupe 8 sur le support, (c) à convertir le composé métallique du groupe 8 précipité en espèces métalliques, et (d) à soumettre la composition de métal-support du groupe 8 à un traitement de purification, avant ou après l'étape (c); ainsi qu'un catalyseur que l'on peut obtenir par ce procédé; et un procédé de préparation d'un carboxylate d'alcényle consistant à faire réagir un mélange contenant une oléfine, un acide carboxylique et de l'oxygène en la présence du catalyseur.

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