Catalyzed SCR filter and emission treatment system
CAFCFirst Claim
1. A catalyst article consisting essentially of a wall flow monolith and catalytic material, 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, and the wall flow monolith contains catalytic material comprising an SCR catalyst composition that permeates the walls at a loading up to 2.4 g/in3.
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Abstract
Provided is an emission treatment system and method for simultaneously remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams. The emission treatment system has an oxidation catalyst upstream of a soot filter coated with a material effective in the Selective Catalytic Reduction (SCR) of NOx by a reductant, e.g., ammonia. Also provided is a method for disposing an SCR catalyst composition on a wall flow monolith that provides adequate catalyst loading, but does not result in unsuitable back pressures in the exhaust.
118 Citations
36 Claims
- 1. A catalyst article consisting essentially of a wall flow monolith and catalytic material, 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, and the wall flow monolith contains catalytic material comprising an SCR catalyst composition that permeates the walls at a loading up to 2.4 g/in3.
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18. A catalyst article consisting essentially of a wall flow monolith and catalytic material, 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 contains the catalyst material comprising an SCR catalyst composition that permeates the walls at a concentration of at least 1.3 g/in3;
- wherein the wall flow monolith has a wall porosity of at least 50% with an average pore size of at least 5 microns.
- View Dependent Claims (19, 27, 28, 29)
- 21. A catalyst article consisting essentially of a wall flow monolith and catalytic material, 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, and the wall flow monolith contains the catalytic material comprising an SCR catalyst composition that permeates the walls.
Specification