Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1996-11-13
1998-02-10
Argenbright, Tony M.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60275, 60286, 60295, 60297, F01N 302
Patent
active
057156778
ABSTRACT:
Reduction of NO.sub.x from diesel engine exhaust by use of plasma-regenerated absorbent beds. This involves a process for the reduction of NO.sub.x and particulates from diesel engines by first absorbing NO.sub.x onto a solid absorbent bed that simultaneously acts as a physical trap for the particulate matter, and second regenerating said solid absorbent by pulsed plasma decomposition of absorbed NO.sub.x followed by air oxidation of trapped particulate matter. The absorbent bed may utilize all metal oxides, but the capacity and the kinetics of absorption and desorption vary between different materials, and thus the composition of the absorbent bed is preferably a material which enables the combination of NO.sub.x absorption capability with catalytic activity for oxidation of hydrocarbons. Thus, naturally occurring or synthetically prepared materials may be utilized, particularly those having NO.sub.x absorption properties up to temperatures around 400.degree. C. which is in the area of diesel engine exhaust temperatures.
REFERENCES:
patent: 5085049 (1992-02-01), Rim et al.
patent: 5419123 (1995-05-01), Masters
UCRL-JC-114931, "Application of Pulsed Plasma NO.sub.x Reduction to Diesel Engine Exhaust", P.H. Wallman et al., Oct. 11, 1993.
Alvin B. Sites et al., "Selective Catalytic Reduction of NO.sub.x in the Presence of Oxygen", Ind. Eng. Chem. Res. 1994, 33, 2259-2264.
UCRL-JC-121974, "Nonthermal Aftertreatment of Diesel Engine Exhaust", P.H. Wallman et al., Sep. 22, 1995.
Vogtlin George E.
Wallman P. Henrik
Argenbright Tony M.
Carnahan L. E.
Sartorio Henry P.
The Regents of the University of California
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