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.
Claims35
An emission treatment system for treatment of an exhaust stream comprising NOx and particulate matter, the system comprising:
- an oxidation catalyst upstream of a soot filter comprising a wall flow monolith and an SCR catalyst composition;
- wherein the wall flow monolith has a plurality of longitudinally extending passages formed by longitudinally extending 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,
- wherein the SCR catalyst composition comprises a zeolite and a base metal component, and
- wherein the SCR catalyst composition permeates the walls at a concentration of at least 1.3 g/in3.
A catalyst article in the form of a soot filter comprising a wall flow monolith and an SCR catalyst composition, wherein the wall flow monolith has a plurality of longitudinally extending passages formed by longitudinally extending 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,
- wherein the wall flow monolith comprises an SCR catalyst composition that permeates the walls at a concentration of at least 1.3 g/in3, wherein the SCR catalyst composition comprises a zeolite and a base metal component.
Dependencies are inferred from the claim text.