Composition with high reducibility made of a nanometric...

B - Operations – Transporting – 01 – J

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B01J 23/02 (2006.01) B01J 35/00 (2006.01) B01J 37/02 (2006.01) B01J 37/03 (2006.01)

Patent

CA 2660002

The composition of the invention comprises a supported oxide, made of a cerium oxide, on a silica, alumina, titanium or zirconium based support. It is characterized in that it comprises particles of said supported oxide, deposited on said support, individualized or in the form of aggregates, being no bigger than 500 nm and having, after 6 hours calcination at a temperature of at least 800 °C, measured reducibility between 30 °C and 900 °C of at least 80%. It can be prepared by a method in which a colloidal dispersion of the supported oxide and a suspension of the support are combined; the resulting mixture is dried by atomization and the resulting product dried using calcination. The composition can be used as a catalyst or a catalyst support.

La composition de l'invention comprend un oxyde supporté, à base d'un oxyde de cérium, sur un support à base de silice, d'alumine, d'oxyde de titane ou de zircone. Elle est caractérisée en ce qu'elle comprend des particules dudit oxyde supporté, déposées sur ledit support, individualisées ou sous forme d'agrégats, de taille d'au plus 500 nm et en ce qu'elle présente, après calcination de 6 heures à une température d'au moins 800°C, une réductibilité mesurée entre 30°C et 900°C d'au moins 80%. Elle peut être préparée par un procédé dans lequel on met en présence une dispersion colloïdale de l'oxyde supporté et une suspension du support; on sèche par atomisation le mélange ainsi formé et on calcine le produit séché ainsi obtenu. La composition peut être utilisée comme catalyseur ou support de catalyseur.

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