Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Effect of Change of Hydrogen Rich Reductant on HC-SCR over Co-Pt/ZSM5 Catalyst

수소 풍부 환원제 변화가 Co-Pt/ZSM5 촉매를 사용하는 탈질 HC-SCR 반응에 미치는 영향

  • 김성수 (한국에너지기술연구소 폐기물 에너지 연구센터) ;
  • 김대영 (서강대학교 화공과) ;
  • 오세용 (서강대학교 화공과) ;
  • 유승준 (서남대학교 환경.화공학부) ;
  • 서영석 (순천향대학교 나노화공과) ;
  • 김진걸 (순천향대학교 나노화공과)
  • Received : 2012.04.21
  • Accepted : 2012.06.22
  • Published : 2012.06.30
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Abstract

HC-SCR was conducted over Co-Pt/ZSM5 catalyst coated over 200 cpsi cordierite in the condition of atomspheric pressure and $200^{\circ}C-500^{\circ}C$. Weight ratio of Co/Pt determined from EDX analysis was 8/2, which was almost equal to the weight ratio at preparation step. XPS showed that nitrates within cobalt precursor and chlorine withn Pt precursor were removed. TEM result demonstrated that crystallite size of cobalt and Pt was under 5nm. Among these tested hydrocarbon reductants, isobutane ($i-C_4H_{10}$) showed the highest de-$NO_x$ yield of 80% under the condition of the mole ratio of reductant/NOx=1.0 at $180^{\circ}C$. De-$NO_x$ yield from HC-SCR was increased as the carbon number of hydrocarbon reductant was increased. The decrease of bonding energy between C and H of HC reductant played a role to increase of de-$NO_x$ yield, which indicated that the dissociation step of C-H bond of hydrocarbon molecule might be the rate determining step of HC-SCR. The increase of oxygen concentration in the feed resulted in the decrease of de-$NO_x$ yield but the increase of CO and $N_2O$ yield.

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References

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