Plasma reactor having regions of active and passive electric...

Details Plasma reactor having regions of active and passive electric... Plasma reactor having regions of active and passive electric...

2006-06-13

2006-06-13

VerSteeg, Steven (Department: 1753)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

With means applying electromagnetic wave energy or...

C204S177000, C204S179000, C423S235000

Reexamination Certificate

active

07060231

ABSTRACT:
A plasma reactor for automotive exhaust gas applications which efficiently promotes diffusion, mass transfer and chemical reaction processes of atoms, ions and radicals, in that the ground (outer) electrode has an axially discrete pattern which provides alternating regions of active and passive electric field along the axial direction of the plasma reactor. As the exhaust gas passes axially along the plasma reactor, each active region produces plasma atoms, ions and radicals, which then have time to react with the NOxover the course of the adjacent passive region. In this manner, successive active regions produce copious atoms, radicals and ions, and the adjacent passive regions provide time for these radicals and ions to react with the NOxand hydrocarbons before the next active region is encountered by the moving stream of exhaust gas, thereby enhancing the performance of the plasma reactor.

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Pending U.S. Appl. No. 10/313,311, Cho et al.
“Comparison of Electrical Discharge Techniques for Nonthermal Plasma Processing of NO in N2”to IEEE, V. 23, No. 4, p. 679 (Aug. 1995).
“Plasma Enhanced Selective Catalytic Reduction: Kinetics of NOxRemoval and Byproduct Formation”, SAE Publication 1999-01-3632 (1999).
“Diesel NOxReduction on Surfaces in Plasma”, SAE Publication 982511 (1998).
“Vehicle Exhaust Treatment Using Electrical Discharge Methods”, SAE Publication 971716 (1997).

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