Regeneration of Used Commercial Catalyst for deNOx Emitted from Stationary Sources

배연 탈질용 폐촉매의 재생에 관한 연구

  • Moon, Il-Shik (Department of Chemical Engineering, Sunchon National University) ;
  • Cho, Gyoujin (Department of Chemical Engineering, Sunchon National University)
  • 문일식 (순천대학교 공과대학 화학공학과) ;
  • 조규진 (순천대학교 공과대학 화학공학과)
  • Received : 1998.09.12
  • Accepted : 1999.01.12
  • Published : 1999.04.10

Abstract

NO removal activity (per unit of mass) of the used catalyst was seriously decreased as low as 27% of the new catalyst. Since the surface area of the used catalyst was 63% of that of the new one, the mojor reason for the lessened activity of the used catalyst compared to the new one may be due to the decreased surface area by sintering and surface concentration of active materials. Poison may be regarded as another important factor, since it affect the active site of catalyst by heavy metals. To recycle the used catalyst, we focused on the removal of poisoning agents from the catalyst. By using $80^{\circ}C$ water for 30 min upto 2 h, the recycled catalyst demonstrated the best activity and efficiency, which may be due to the removal of both K and Na. Although the recovered activity (per unit of surface area) of the catalyst was 79% compared to the new one, the activity (per unit of mass) of the recovered catalyst was only 49% compared of the activity of fresh catalyst.

Keywords

$NO_x$;SCR;Regeneration of Honeycomb Catalyst

Acknowledgement

Supported by : 순천대학교

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