Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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The Effects of Zeolite Structure and Ion-exchange Material on NH3-SCR Reaction

제올라이트 종류 및 이온교환 물질에 따른 NH3-SCR 촉매 반응 특성

  • Hwang, Inhye (Environmental System Research Division, Engine Research Team, Korea Institute of Machinery & Materials) ;
  • Lee, Junho (Environmental System Research Division, Engine Research Team, Korea Institute of Machinery & Materials) ;
  • Kim, Hongsuk (Environmental System Research Division, Engine Research Team, Korea Institute of Machinery & Materials) ;
  • Jeong, Youngil (Environmental System Research Division, Engine Research Team, Korea Institute of Machinery & Materials)
  • 황인혜 (한국기계연구원 그린동력연구실) ;
  • 이준호 (한국기계연구원 그린동력연구실) ;
  • 김홍석 (한국기계연구원 그린동력연구실) ;
  • 정용일 (한국기계연구원 그린동력연구실)
  • Received : 2013.05.10
  • Accepted : 2013.07.02
  • Published : 2014.01.01
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Abstract

$NH_3$-SCR has high NOx removal efficiency approximately 80~90%. Recently, the copper or iron ion-exchanged zeolite catalysts are widely used as automobile SCR catalysts. In this paper, the effect of the space velocity, temperature of reaction and $NO_2$ addition on the $NH_3$-SCR reaction were studied using various zeolite SCR catalysts. The test was conducted with small sized fresh catalysts in a laboratory fixed-bed flow reactor system using simulated gases. It is found that the activity of the BEA is better than MFI. It seems that three-dimensional framework and a wide pore entrance of BEA enhances the SCR activity. It is also found that low temperature activity of Cu-zeolites was better than Fe-zeolites. Once $NO_2$ was added, the NOx conversion activity of the Cu-zeolite was slightly enhanced, whereas remarkable improvement was achieved by Fe-zeolite.

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References

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