Alumina-coated metal structure and catalyst structure

Details Alumina-coated metal structure and catalyst structure Alumina-coated metal structure and catalyst structure

B - Operations, Transporting

01

J

B01J 37/02 (2006.01)

Patent

CA 2534187

A metal substrate is coated with a layer of ceramic, by spraying droplets of a slurry of a ceramic precursor onto the substrate, the substrate being at a temperature between 500 ~C and 750 ~C. The ceramiccomprises alumina, and is made macroporous by spraying a mixture of alumina sol and alumina particles with no more than 35 % by weight of dispersible alumina. Spraying onto a red- hot surface in this fashion leads to a very marked improvement in adhesion of the resulting ceramic to the metal substrate. A catalytically active material may then be incorporated in the ceramic layer, so as to form a catalyst structure (16).

Dans cette invention, un substrat métallique est recouvert d'une couche de céramique par vaporisation de gouttelettes d'une boue de précurseur de céramique, la température du substrat se situant entre 500·C et 750·C. La céramique, qui contient de l'alumine, est rendue macroporeuse par vaporisation d'un mélange de sol d'alumine et de particules d'alumine avec moins de 35 % en poids d'alumine dispersable. Ce type de vaporisation appliqué sur une surface chauffée au rouge améliore nettement l'adhérence de la céramique obtenue à la surface métallique. Un matériau à activité catalytique peut être incorporé dans la couche de céramique de manière à former la structure catalysante (16).

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