SCR on low thermal mass filter substrates
AssigneeBASF SE
InventorsR. Samuel Boorse, Joseph C. Dettling
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Abstract
Provided are selective catalytic reduction (SCR) filters that effectively provide simultaneous treatment of particulate matter and NOx. Provided also are methods for reducing NOx concentration and particulate matter in a diesel engine exhaust by using the SCR filters. The SCR filter can include a fiber matrix wall flow filter comprising a plurality of non-woven inorganic fibers and a chabazite molecular sieve SCR catalyst on the fiber matrix wall flow filter. By combining a fiber matrix wall flow filter with a chabazite molecular sieve SCR catalyst, high catalyst loading can be achieved without causing excessive back pressure across the filter when implemented in emission treatment systems.
Claims10
A method of reducing NOx and particulate matter in a diesel engine exhaust, comprising:
- injecting ammonia or an ammonia precursor into the diesel engine exhaust;
- and
- passing the exhaust through a SCR filter comprising a fiber matrix wall flow filter and a chabazite molecular sieve SCR catalyst on the fiber matrix wall flow filter, the fiber matrix wall flow filter comprising a plurality of non-woven inorganic fibers.
Dependencies are inferred from the claim text.