Multi-stage selection catalytic reduction of NO{sub x} in lean burn engine exhaust

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Recent studies suggest that the conversion of NO to NO{sub 2} is an important intermediate step in the selective catalytic reduction (SCR) of NO{sub x} to N{sub 2}. These studies have prompted the development of schemes that use an oxidation catalyst to convert NO to NO{sub 2}, followed by a reduction catalyst to convert NO{sub 2} to N{sub 2}. Multi-stage SCR offers high NO{sub x} reduction efficiency from catalysts that, separately, are not very active for reduction of NO, and alleviates the problem of selectivity between NO reduction and hydrocarbon oxidation. A plasma can also be used to oxidize NO ... continued below

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7 p.

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Penetrante, B.M.; Hsiao, M.O.; Merritt, B.T. & Vogling, E. January 26, 1998.

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Description

Recent studies suggest that the conversion of NO to NO{sub 2} is an important intermediate step in the selective catalytic reduction (SCR) of NO{sub x} to N{sub 2}. These studies have prompted the development of schemes that use an oxidation catalyst to convert NO to NO{sub 2}, followed by a reduction catalyst to convert NO{sub 2} to N{sub 2}. Multi-stage SCR offers high NO{sub x} reduction efficiency from catalysts that, separately, are not very active for reduction of NO, and alleviates the problem of selectivity between NO reduction and hydrocarbon oxidation. A plasma can also be used to oxidize NO to NO{sub 2}. This paper compares the multi-stage catalytic scheme with the plasma-assisted catalytic scheme for reduction of NO{sub x} in lean-bum engine exhausts. The advantages of plasma oxidation over catalytic oxidation are presented.

Physical Description

7 p.

Notes

OSTI as DE98052275

Other: FDE: PDF; PL:

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  • 1997 diesel engine emissions reduction workshop, San Diego, CA (United States), 27-31 Jul 1997

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  • Other: DE98052275
  • Report No.: UCRL-JC--128071
  • Report No.: CONF-970799--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 325395
  • Archival Resource Key: ark:/67531/metadc688253

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  • January 26, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 6, 2017, 6:06 p.m.

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Penetrante, B.M.; Hsiao, M.O.; Merritt, B.T. & Vogling, E. Multi-stage selection catalytic reduction of NO{sub x} in lean burn engine exhaust, article, January 26, 1998; California. (digital.library.unt.edu/ark:/67531/metadc688253/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.