Platinum group metal-free catalysts for reducing the...

B - Operations – Transporting – 01 – D

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B01D 53/94 (2006.01) B01J 23/02 (2006.01) B01J 23/83 (2006.01)

Patent

CA 2583778

A catalyzed diesel particulate filter (CDPF) and a method for filtering particulates from diesel engine exhaust are provided, where the catalyzed diesel particulate filter includes a substrate and a catalyst composition, where the catalyst composition contains at least one first component, at least one second component, and at least one third component, where the first component is at least one first component selected from the group consisting of cerium and a lanthanide and mixtures thereof, the at least one second component is selected from the group consisting of cobalt, copper, manganese and mixtures thereof; and the third component comprises strontium, where the first component, the second component, and the third component are in an oxide form after calcination. The catalyst on the catalyzed diesel particulate filter lowers the temperature at which particulates are removed from the CDPF by oxidizing the particulates on the filter. The catalyzed diesel particulate filter may also include a washcoat. Washcoats prepared from colloidal aluminum oxide may have higher surface areas and pore volumes loadings than washcoats containing aluminum oxide prepared from aluminum nitrate.

L'invention concerne un filtre à particules diesel catalysé et un procédé de filtrage de particules d'échappement diesel, ledit filtre comprenant un substrat et une composition catalytique. Cette composition contient au moins une première composante, au moins une seconde composante et au moins une troisième composante. La première est une composante du groupe cérium, lanthanide, y compris leurs mélanges, la seconde est une composante du groupe cobalt, cuivre, manganèse, y compris leurs mélanges, et la troisième est une composante qui contient du strontium, ces trois composantes étant sous la forme d'oxyde après calcination. Le catalyseur du filtre abaisse la température à laquelle les particules sont éliminées du filtre par oxydation de ces particules sur le filtre. Le filtre en question peut également comprendre une couche d'imprégnation. Les couches d'imprégnation établies à partir d'oxyde d'aluminium colloïdal peuvent avoir des surfaces et des charges de volume de pores plus importantes que les couches d'imprégnation à oxyde d'aluminium établies à partir de nitrate d'aluminium.

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