Plasma-assisted catalytic storage reduction system [electronic resource].

Published:: Berkeley, Calif. : Lawrence Berkeley National Laboratory, 2000.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators:: Lawrence Berkeley National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

A two-stage method for NO.sub.x reduction in an oxygen-rich engine exhaust comprises a plasma oxidative stage and a storage reduction stage. The first stage employs a non-thermal plasma treatment of NO.sub.x gases in an oxygen-rich exhaust and is intended to convert NO to NO.sub.2 in the presence of O.sub.2 and hydrocarbons. The second stage employs a lean NO.sub.x trap to convert such NO.sub.2 to environmentally benign gases that include N.sub.2, CO.sub.2, and H.sub.2 O. By preconverting NO to NO.sub.2 in the first stage with a plasma, the efficiency of the second stage for NO.sub.x reduction is enhanced. For example, an internal combustion engine exhaust is connected by a pipe to a first chamber in which a non-thermal plasma converts NO to NO.sub.2 in the presence of O.sub.2 and hydrocarbons, such as propene. A flow of such hydrocarbons (C.sub.x H.sub.y) is input from usually a second pipe into at least a portion of the first chamber. The NO.sub.2 from the plasma treatment proceeds to a storage reduction catalyst (lean NO.sub.x trap) that converts NO.sub.2 to N.sub.2, CO.sub.2, and H.sub.2 O, and includes a nitrate-forming catalytic site. The hydrocarbons and NO.sub.x are simultaneously reduced while passing through the lean-NO.sub.x trap catalyst. The method allows for enhanced NO.sub.x reduction in vehicular engine exhausts, particularly those having relatively high sulfur contents.

Report Numbers:

E 1.99:us 6038853
us 6038853

Other Subject(s):

Plasma-Assisted Catalytic Storage Reduction Two-Stage Method Reduction Oxygen-Rich Engine Exhaust Comprises Plasma Oxidative Stage Storage Reduction Stage Stage Employs Non-Thermal Plasma Treatment Gases Oxygen-Rich Exhaust Intended Convert Presence Hydrocarbons Stage Employs Lean Trap Convert Environmentally Benign Gases Preconverting Stage Plasma Efficiency Stage Reduction Enhanced Example Internal Combustion Engine Exhaust Connected Pipe Chamber Non-Thermal Plasma Converts Presence Hydrocarbons Propene Flow Hydrocarbons Input Pipe Portion Chamber Plasma Treatment Proceeds Storage Reduction Catalyst Lean Trap Converts Nitrate-Forming Catalytic Site Hydrocarbons Simultaneously Reduced Passing Lean-No Trap Catalyst Method Allows Enhanced Reduction Vehicular Engine Exhausts Particularly Relatively Sulfur Contents Environmentally Benign Sulfur Content Internal Combustion Combustion Engine Non-Thermal Plasma Non-Thermal Plasma Method Allows Engine Exhaust Engine Exhaust Engine Exhaust Storage Reduction Storage Reduction Storage Reduction Benign Gases Plasma Treatment Plasma Treatment Plasma Converts Simultaneously Reduced Simultaneously Reduce Oxygen-Rich Exhaust Engine Exhausts Exhaust Comprises Method Allow Stage Method Plasma-Assisted Catalytic

Note:

Published through SciTech Connect.
01/01/2000.
"us 6038853"
Brusasco, Raymond M.; Merritt, Bernard T.; Vogtlin, George E.; Penetrante, Bernardino M.

Funding Information:

W-7405-ENG-48

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