Method for the reduction of NO x and NH 3 emissions

Details Method for the reduction of NO x and NH 3 emissions Method for the reduction of NO x and NH 3 emissions

2007-03-09

2009-02-03

Vanoy, Timothy C (Department: 1793)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

C423S213500, C423S213700, C423S239100, C060S274000, C060S282000, C060S299000, C060S302000

Reexamination Certificate

active

07485273

ABSTRACT:
This catalyst system simultaneously removes ammonia and enhances net NOxconversion by placing an NH3—SCR catalyst formulation downstream of a lean NOxtrap. By doing so, the NH3—SCR catalyst adsorbs the ammonia from the upstream lean NOxtrap generated during the rich pulses. The stored ammonia then reacts with the NOxemitted from the upstream lean NOxtrap—enhancing the net NOxconversion rate significantly, while depleting the stored ammonia. By combining the lean NOxtrap with the NH3—SCR catalyst, the system allows for the reduction or elimination of NH3and NOxslip, reduction in NOxspikes and thus an improved net NOxconversion during lean and rich operation.

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