Catalyzed SCR filter and emission treatment system
AssigneeBASF SE
InventorsJoseph A. Patchett, Joseph C. Dettling, Elizabeth A. Przybylski
Life of this patent
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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.
Claims29
A catalyst article comprising a wall flow monolith and a 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, the wall flow monolith has a porosity of from 60% to 75% and an average pore size of at least 5 microns, and the wall flow monolith contains the catalytic material;
- wherein the catalytic material comprises an SCR catalyst composition including a zeolite and base metal selected from copper, the SCR catalyst composition permeating the walls at a loading up to 2.4 g/in3, the wall flow monolith having integrated, NOx and particulate removal efficiency in which presence of the catalytic material in the wall flow monolith catalyzes the oxidation of soot.
A catalyst article comprising a wall flow monolith and a 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, the wall flow monolith has a porosity of from 60% to 75% and an average pore size of at least 5 microns, and the wall flow monolith contains the catalytic material,
- wherein the catalytic material comprises an SCR catalyst composition including a zeolite and base metal selected from a copper component, the SCR catalyst composition permeating the walls at a loading of at least 1.3 g/in3,
- the wall flow monolith having integrated, NOx and particulate removal efficiency in which presence of the catalytic material in the wall flow monolith catalyzes the oxidation of soot.
A catalyst article comprising a wall flow monolith and a 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, the wall flow monolith has a porosity of from 60% to 75% and an average pore size of from 10 to 30 microns, and the wall flow monolith contains the catalytic material,
- wherein the catalytic material comprises an SCR catalyst composition including a zeolite and base metal, the SCR catalyst composition permeating the walls,
- the wall flow monolith having integrated, NOx and particulate removal efficiency in which presence of the catalytic material in the wall flow monolith catalyzes the oxidation of soot.
Dependencies are inferred from the claim text.