Improved catalyzed soot filter and method (s) to make these

B - Operations – Transporting – 01 – J

Patent

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B01J 23/04 (2006.01) B01D 53/94 (2006.01) B01J 27/22 (2006.01) B01J 27/224 (2006.01) B01J 37/08 (2006.01)

Patent

CA 2701486

An improved soot catalyst is comprised of an alkali compound at least partially coated by a ceramic coating com-prised of C bonded to a metal, semimetallic element or combination thereof. The improved soot catalyst may be employed in catalyzed Diesel particulate filters. In one method to make a catalyzed Diesel particulate filter, the improved filter is made by con-tacting a porous ceramic body having an alkali catalyst thereon, coating the alkali catalyst with an organic ceramic precursor, heating the ceramic body to a temperature in an atmosphere sufficient to decompose the organic ceramic precursor to form the soot catalyst on the porous ceramic body without volatilizing substantial amount of the alkali catalyst away.

L'invention porte sur un catalyseur de suie perfectionné comprenant un composé alcalin au moins partiellement revêtu d'un revêtement céramique composé de C lié à un métal, un élément semi-métallique ou une combinaison de ceux-ci. Le catalyseur de suie perfectionné peut être employé dans des filtres à particules Diesel catalysés. Selon un procédé de fabrication d'un filtre à particules Diesel catalysé, le filtre perfectionné est obtenu par mise en contact d'un corps céramique poreux sur lequel a été appliqué un catalyseur alcalin, revêtement du catalyseur alcalin avec un précurseur céramique organique, chauffe du corps céramique à une température dans une atmosphère suffisante pour décomposer le précurseur céramique organique afin de former le catalyseur de suie sur le corps céramique poreux sans éliminer par volatilisation une quantité substantielle du catalyseur alcalin.

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