Kinetics of Hydrogen Rich Ethanol as Reductant for HC-SCR over $Al_2O_3$ Supported Ag Catalyst

Ag/$Al_2O_3$ 촉매하의 HC-SCR에서 수소 풍부 에탄올의 반응 특성

  • 이주헌 ((주)코켓 환경사업팀) ;
  • 박정환 (순천향대학교 나노화공과) ;
  • 김성수 (한국에너지연구소 폐기물 에너지 연구센터) ;
  • 유승준 (서남대학교 환경.화공학부) ;
  • 김진걸 (순천향대학교 나노화공과)
  • Received : 2010.10.05
  • Accepted : 2010.12.17
  • Published : 2010.12.31

Abstract

Ethanol was used as reductant to remove $NO_x$ over Ag/$Al_2O_3$ catalyst via SCR from stationary emission source. Among the tested hydrocarbon reductants, ethanol showed highest de-$NO_x$ performance over the Ag/$Al_2O_3$ catalyst. De-$NO_x$ efficiency of about 83% was obtained in the condition of GHSV 20,000 $hr^{-1}$, $NO_x$ 200 ppm, CO 200 ppm, $O_2$ 13%, $H_2O$ 5% and mole ratio of ethanol/$NO_x$ = 2 between temperature of $300^{\circ}C$ and $400^{\circ}C$. While $SO_2$ presence in the $NO_x$ exhaust suppressed the catalytic activity, catalyst with acid (0.7% $H_2SO_4$) treatment of catalyst showed higher catalytic activity, where In-Situ DRIFT showed S presence over catalyst surface was increased after acid treatment of catalyst. From in-situ DRIFT and SCR results, it was concluded that sulfur presence over the surface of Ag/$Al_2O_3$ catalyst was the dominant factor to control the de-$NO_x$ reaction yield via HC-SCR from the exhausted gas including $SO_2$.

Keywords

Ethanol;Reduction;Ag/$Al_2O_3$;$NO_x$ removal

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