NO x reduction in lean burn engine exhaust

Details NO x reduction in lean burn engine exhaust NO x reduction in lean burn engine exhaust

2007-09-25

2007-09-25

Tran, Binh Q. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S274000, C060S275000, C060S301000, C060S303000, C422S186070, C422S186300, C204S164000, C204S177000

Reexamination Certificate

active

11257760

ABSTRACT:
The nitric oxide (NO) and nitrogen dioxide (NO2) content of lean-burn engine exhaust is beneficially prepared for selective catalytic reduction (SCR) of these oxides to nitrogen by two sidestream additions to the exhaust. An ozone-containing air stream is added to the exhaust to affect oxidation of NO to NO2. And a hydrocarbon(s) fuel constituent is added to a second humidified ozone-containing air stream and that mixture subjected to UV radiation. Strongly oxidizing hydroxyl radicals are formed by interaction of ozone, water, and UV radiation for reaction with the hydrocarbon. The resulting partially oxidized hydrocarbons (Pox) are added to the exhaust, providing effective reduction materials for the SCR of NO2to nitrogen and water.

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GM Patent U.S. Appl. No. 10/948,403, filed Sep. 23, 2004, entitled Plasma-Assisted NOx Reduction.
GM Patent U.S. Appl. No. 11/064,523, filed Feb. 23, 2005, entitled Destruction of Hydrocarbon Emissions.
GM Patent U.S. Appl. No. 11/141,969, filed Jun. 1, 2005, entitled Reforming Diesel Fuel for NOx Reduction.
GM Patent U.S. Appl. No. 11/155,179, filed Jun. 17, 2005, entitled Continuous Reforming of Diesel Fuel for NOx Reduction.

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