Plasma-assisted NO x reduction

Details Plasma-assisted NO x reduction Plasma-assisted NO x reduction

2008-05-06

2008-05-06

Vanoy, Timothy C. (Department: 1793)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

C423S239100, C423S239200, C204S176000

Reexamination Certificate

active

07368094

ABSTRACT:
Ozone, preferably produced in an ambient air stream passed through a non-thermal hyperplasma reactor, is added to the hot exhaust gas stream from a lean-burn (oxygen-rich) combustion source. The ozone converts much of the NO in the NOxcontaining exhaust stream to NO2. The resulting NO2/NOxratio can be controlled by the input energy density to the plasma reactor. Ammonia and/or urea is added to the ozone treated exhaust in proportion to the NOxcontent, and the stream passed into contact with a reduction catalyst, such as a base metal-exchanged zeolite, to convert the NOxto nitrogen.

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Russell Tonkyn et al, Vechicle Exhaust Treatment using Electrical Discharge Methods, pp. 1-6, SAE Paper 971716 (1997) no month.
M. Lou Balmer et al, Diesel NOx reduction on Surfaces in Plasma, pp. 1-6, SAE Paper 982511 (1998) no month.
International Search Report for PCT/US05/28206 mailed Aug. 28, 2006 corresponding to the subject application.

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