Catalyzed scr filter and emission treatment system
AssigneeBASF SE
InventorsJoseph A. Patchett, Joseph C. Dettling, Elizabeth A. Przybylski
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Abstract
Provided is a catalyst article for simultaneously remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams. The catalyst article has a soot filter coated with a material effective in the Selective Catalytic Reduction (SCR) of NOx by a reductant, e.g., ammonia.
Claims22
1-27. (canceled)
A catalyst article comprising a wall flow monolith and a catalytic material contained within the wall flow monolith, wherein the wall flow monolith has a wall porosity of at least 50% and comprises a plurality of longitudinally extending passages formed by longitudinally extending porous walls bounding and defining said passages, wherein the passages comprise inlet passages having an open inlet end and a closed outlet end, and outlet passages having a closed inlet end and an open outlet end, and wherein the catalytic material comprises a zeolite and a base metal selected from copper and iron present in an amount of from about 0.1 to 30 percent by weight of the total weight of base metal plus zeolite, the zeolite having pores connected in three dimensions and a silica to alumina ratio of at least about 10, the wall flow monolith having integrated NOx and particulate removal efficiency when exposed to diesel engine exhaust and ammonia or an ammonia precursor.
Dependencies are inferred from the claim text.