Plasma/catalyst system for reduction of NO<inf>x</inf> in lean conditions

Hyeong Sang Lee, Kwang Min Chun, Seung Jin Song, Jae Hong Ryu, Dae Won Lee, Kwan Young Lee, Bae Hyeock Chun

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

NO<inf>x</inf> conversion to N<inf>2</inf> was investigated by a plasma/catalyst system in rich oxygen similar to a lean-burn engine exhaust. Catalytic activity was enhanced by the assistance of plasma, and the plasma/catalyst system showed higher NO<inf>x</inf> conversion over a wider temperature window than did catalyst alone. The plasma/catalyst (Ag/Al<inf>2</inf>O<inf>3</inf>) system showed a remarkable improvement in NO<inf>x</inf> conversion in the lower temperature range under 400 °C. The NO<inf>x</inf> conversion of plasma/catalyst (Ag/Al<inf>2</inf>O<inf>3</inf>) was 40%-50%, and its selectivity to N<inf>2</inf> was over 96% under the conditions that the hydrocarbon (C1 base) to NO<inf>x</inf> ratio was about 3 and 10% O<inf>2</inf> existed over the temperature range of 300-500 °C. Ag/Al<inf>2</inf>O<inf>3</inf> showed a better performance than Al<inf>2</inf>O<inf>3</inf> when assisted by plasma. Helium was used as a balance gas to measure N<inf>2</inf> formation by gas chromatography, and NO<inf>x</inf> conversion was measured by a chemiluminescence NO<inf>x</inf> analyzer in N<inf>2</inf> balance as well as He balance. The result in N<inf>2</inf> balance gas was compared with the result in helium balance gas at the 300 °C where the largest enhancement by plasma was observed. The NO<inf>x</inf> conversion in N<inf>2</inf> balance gas was similar to that in helium balance gas, which verified that the plasma effect obtained in helium balance gas is consistent with that of N<inf>2</inf> balance gas, which is the largest component of the real exhaust gas.

Original languageEnglish
Pages (from-to)1227-1232
Number of pages6
JournalProceedings of the Combustion Institute
Volume28
Issue number1
Publication statusPublished - 2000
Externally publishedYes

Fingerprint

Gases
Plasmas
catalysts
Helium
Catalysts
gases
helium
Vehicle Emissions
Exhaust systems (engine)
Chemiluminescence
real gases
exhaust gases
Hydrocarbons
Exhaust gases
chemiluminescence
Gas chromatography
Temperature
gas chromatography
Catalyst activity
engines

ASJC Scopus subject areas

  • Mechanical Engineering
  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

Lee, H. S., Chun, K. M., Song, S. J., Ryu, J. H., Lee, D. W., Lee, K. Y., & Chun, B. H. (2000). Plasma/catalyst system for reduction of NO<inf>x</inf> in lean conditions. Proceedings of the Combustion Institute, 28(1), 1227-1232.

Plasma/catalyst system for reduction of NO<inf>x</inf> in lean conditions. / Lee, Hyeong Sang; Chun, Kwang Min; Song, Seung Jin; Ryu, Jae Hong; Lee, Dae Won; Lee, Kwan Young; Chun, Bae Hyeock.

In: Proceedings of the Combustion Institute, Vol. 28, No. 1, 2000, p. 1227-1232.

Research output: Contribution to journalArticle

Lee, HS, Chun, KM, Song, SJ, Ryu, JH, Lee, DW, Lee, KY & Chun, BH 2000, 'Plasma/catalyst system for reduction of NO<inf>x</inf> in lean conditions', Proceedings of the Combustion Institute, vol. 28, no. 1, pp. 1227-1232.
Lee, Hyeong Sang ; Chun, Kwang Min ; Song, Seung Jin ; Ryu, Jae Hong ; Lee, Dae Won ; Lee, Kwan Young ; Chun, Bae Hyeock. / Plasma/catalyst system for reduction of NO<inf>x</inf> in lean conditions. In: Proceedings of the Combustion Institute. 2000 ; Vol. 28, No. 1. pp. 1227-1232.
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