Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Catalytic Nitrate Reduction in Water over Mesoporous Silica Supported Pd-Cu Catalysts

중형 기공성 실리카 담체에 담지된 Pd-Cu 촉매를 활용한 수중 질산성 질소 저감 반응

  • Kim, Min-Sung (Department of Chemical and Biological Engineering, Korea University) ;
  • Chung, Sang-Ho (Department of Chemical and Biological Engineering, Korea University) ;
  • Lee, Myung Suk (Department of Chemical and Biological Engineering, Korea University) ;
  • Lee, Dae-Won (Department of Chemical and Biological Engineering, Korea University) ;
  • Lee, Kwan-Young (GREEN SCHOOL, Korea University)
  • 김민성 (고려대학교 화공생명공학과) ;
  • 정상호 (고려대학교 화공생명공학과) ;
  • 이명석 (고려대학교 화공생명공학과) ;
  • 이대원 (고려대학교 화공생명공학과) ;
  • 이관영 (고려대학교 그린스쿨 전문대학원)
  • Received : 2013.02.19
  • Accepted : 2013.03.08
  • Published : 2013.03.31
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Abstract

In this study, we investigated the activity of Pd and Cu co-incorporated on mesoporous silica support such as MCM-41 and SBA-15 for catalytic nitrate reduction in water. In pure hydrogen flow, nitrate concentration was gradually decreased with the reaction time, but nitrogen selectivity was too low due to very high pH of reaction medium after the reaction. In order to acquire high nitrogen selectivity, we utilized carbon dioxide as a pH buffer, which resulted in higher nitrogen selectivity (about 40%). For the above reaction conditions, Pd-Cu/MCM-41 showed better performance than Pd-Cu/SBA-15. The physicochemical properties of both catalysts were investigated to figure out the relationship between the characteristics of the catalysts and the catalytic activity on the catalytic nitrate reduction by $N_2$ adsoprtion-desorption, X-ray diffraction (XRD), $H_2$-temperature programmed reduction, X-ray photoelectron spectroscopy (XPS) techniques.

본 연구에서는 중형 기공성 실리카 담체인 MCM-41과 SBA-15를 활용하여 팔라듐과 구리를 담지한 후, 제조 촉매의 수중 질산성 질소 저감 반응 활성을 평가하였다. 순수 수소 공급 반응 조건에서, 질산성 질소의 농도는 반응 시간에 따라 점차 저감되었지만, 반응기 내부에 높게 형성된 pH로 인해 질소의 선택도가 매우 낮은 문제점이 발견되었다. 이를 해결하기 위해 이산화탄소를 수소와 함께 공급하여 pH의 안정화를 도모하였고, 질소 선택도를 40% 가량 증가시켰다. 상기 두 반응 조건에서 모두 Pd-Cu/MCM-41가 Pd-Cu/SBA-15보다 높은 활성을 나타냈다. 이와 같이 수중 질산성 질소 저감 반응의 활성에 차이를 보이는 두 촉매에 대하여, 질소 흡-탈착, XRD, $H_2$-TPR, XPS 등과 같은 특성 분석을 수행하여 제조 촉매의 구조와 물성이 반응활성에 미치는 영향을 검토해보았다.

Keywords

References

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