Process for preparing catalytically active coatings for the...

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B01J 37/02 (2006.01) B01J 23/40 (2006.01) B01J 23/42 (2006.01) B01J 27/24 (2006.01) B05D 7/22 (2006.01) C01C 3/02 (2006.01)

Patent

CA 2203728

The invention relates to a process for preparing catalytically active coatings for the synthesis of hydrogen cyanide on moulded items substantially consisting of aluminium oxide. The catalytically active coatings contain, as active components, at least one platinum metal and a nitride which are applied to the moulded item by means of a coating dispersion which contains the active components as finely divided solids. This means that the hitherto conventional production of aluminium nitride during the forming process is not required. The coatings therefore achieve their final activity level, which is well above that of conventional coatings, very rapidly. In addition, these catalysts can be started up under high load and have a lower operating temperature.

L'invention a trait à un procédé pour préparer des revêtements catalytiquement actifs pour la synthèse de l'acide cyanhydrique sur des pièces moulées composées essentiellement d'oxyde d'aluminium. Les revêtements catalytiquement actifs contiennent, en tant qu'éléments actifs, au moins un métal de la mine de platine et un nitrure, qui sont appliqués à la pièce moulée sous forme de revêtements dispersés dont les composants actifs sont des solides finement divisés. Ce procédé élimine la nécessité de recourir aux procédés traditionnels pour produire du nitrure d'aluminium. Les revêtements parviennent ainsi rapidement à leur niveau d'activité final, qui est nettement supérieur à celui des revêtements traditionnels. De plus, ces catalyseurs peuvent être utilisés à une capacité élevée et à une faible température de fonctionnement.

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