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 journalArticlepeer-review

9 Citations (Scopus)


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
Issue number1
Publication statusPublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • Mechanical Engineering
  • General Chemical Engineering
  • Physical and Theoretical Chemistry


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