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US 5,711,147 AGranted
Plasma-assisted catalytic reduction system
AssigneeThe Regents of the University of California
InventorsGeorge E. Vogtlin, Bernard T. Merritt, Mark C. Hsiao, P. Henrik Wallman, Bernardino M. Penetrante
Life of this patent
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Abstract
Non-thermal plasma gas treatment is combined with selective catalytic reduction to enhance NO.sub.x reduction in oxygen-rich vehicle engine exhausts.
Claims7
A system for NO.sub.x reduction in oxygen-rich vehicle engine exhausts, comprising:
- a first reactor means for non-thermal plasma gas treatment connected to receive a supply of hydrocarbons and an engine exhaust rich in oxygen and having NO, and connected to output a product of NO.sub.2 that has been electric-plasma converted from said NO;
- and
- a second reactor means for selective catalytic reduction connected to receive-both said output of the first reactor means with said NO.sub.2 and connected to receive said supply of hydrocarbons, and connected to output an exhaust with reduced NO.sub.x emissions.
A vehicle with reduced NO.sub.x engine exhaust emissions, comprising:
- a fuel supply of hydrocarbons;
- an internal combustion engine connected to receive said fuel supply of hydrocarbons and to propel a vehicle, and having an oxygen-rich exhaust comprising NO;
- a first reactor means for non-thermal plasma gas treatment connected to receive an electrical supply, said fuel supply of hydrocarbons, and said oxygen-rich exhaust comprising NO, and connected to output therefrom a product of NO.sub.2 that has been electric-plasma converted from said NO;
- and
- a second reactor means for selective catalytic reduction connected to receive said output of the first reactor means with said NO.sub.2 and connected to receive said supply of hydrocarbons, and connected to output an exhaust with reduced NO.sub.x emissions.
2 more elements
Dependencies are inferred from the claim text.