한국자동차공학회논문집 (Transactions of the Korean Society of Automotive Engineers)

  • 제13권2호
  • /
  • Pages.135-141
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  • 2005
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  • 1225-6382(pISSN)
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  • 2234-0149(eISSN)
한국자동차공학회 (The Korean Society of Automotive Engineers)
권호 표지

메탄올을 환원제로 사용하는 과잉산소 분위기에서 $La_2O_3$ 촉매를 이용한 NO의 환원에 관한 연구

Catalytic Reduction of Nitric Oxide in Oxygen-Rich Exhaust with Methanol over $La_2O_3$ Catalysts

  • 김상환 (건국대학교 화학공학과) ;
  • 유현주 (건국대학교 화학공학과) ;
  • 박정규 (건국대학교 기계공학과)
  • Kim, Sang-Hwan (Department of Chemical Engineering, Konkuk University) ;
  • Yoo, Hyun-Ju (Department of Chemical Engineering, Konkuk University) ;
  • Park, Jung-Kyu (Department of Mechanical Engineering, Konkuk University)
  • 발행 : 2005.03.01
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초록

Nitric oxide(NO) reduction by methanol was investigated over $La_2O_3$ catalysts in the presence and absence of oxygen. In the absence of $O_2$, $CH_3OH$ reduced NO to both $N_2$ and $N_2O$, with selectivity to $N_2$ formation decreasing from 81-88% at 623K to 47-71% at 723 K. With 1.2% $O_2$ in the feed, the rates were 4-8 times higher, but the selectivity to $N_2$ dropped from 50% at 623 K to 9% at 723 K. The specific activities with $La_2O_3$ for this reaction were higher than those for other reductants; for example, at 773 K with hydrogen a specific activity of $34\;{\mu}mol\;NO/sec{\cdot}m^2$ was obtained whereas that for methanol was $638\;{\mu}mol\;NO/sec{\cdot}m^2$. The Arrhenius plots were linear under differential reaction conditions, and the apparant activation energy was consistantly near 15 kcal/mol with $CH_3OH$. Linear partial pressure dependencies based on a power rate law were obtained and showed a near-zero order in $CH_3OH$ and a near-first order in $H_2$.

키워드

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