Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Catalytic Nitrate Reduction in Water over Nanosized TiO2 Supported Pd-Cu Catalysts

나노 크기의 타이타니아 담체를 활용한 Pd-Cu 촉매의 수중 질산성 질소 저감 반응에의 적용

  • Kim, Min-Sung (Department of Chemical and Biological Engineering, Korea University) ;
  • Lee, Jiyeon (Department of Chemical and Biological Engineering, Korea University) ;
  • Lee, Kwan-Young (GREEN SCHOOL, Korea University)
  • 김민성 (고려대학교 화공생명공학과) ;
  • 이지연 (고려대학교 화공생명공학과) ;
  • 이관영 (고려대학교 그린스쿨 전문대학원)
  • Received : 2013.11.29
  • Accepted : 2014.01.17
  • Published : 2014.03.31
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Abstract

In this study, we synthesized $TiO_2$ supports with nanosized crystalline structure by solvothermal method and prepared $TiO_2$ supported Pd-Cu catalysts. It was shown that the crystalline size of $TiO_2$ support in the catalyst influenced on the catalytic activity of nitrate reduction in water. The catalyst with the smaller crystalline size of $TiO_2$ support presented faster nitrate reduction rate, but had low nitrogen selectivity due to high pH environment of reaction medium during the reaction. Through injection of carbon dioxide as a pH buffer, the nitrogen selectivity increased by about 60%. Furthermore, we investigated that the relationships between the catalytic performance and the physicochemical properties of the prepared catalysts characterized by $N_2$ adsoprtion-desorption, X-ray diffraction (XRD), $H_2$-temperature programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS).

본 연구에서는 나노 크기의 결정 구조를 가진 타이타니아 담체를 용매열합성법(solvothermal method)을 활용하여 합성한 후 팔라듐과 구리를 담지한 촉매를 제조하였다. 제조된 촉매를 수중 질산성 질소 저감 반응에 적용한 결과, 타이타니아 담체의 결정 크기가 반응 활성에 영향을 미치는 것이 확인되었다. 결정 크기가 작은 담체를 활용한 촉매가 더 빠른 속도로 질산성 질소를 저감하였지만, 반응 중 pH가 높게 형성되어 질소 선택도가 매우 낮은 현상을 보였다. 이를 해결하기 위해 pH 완충제인 이산화탄소를 공급하여 질소 선택도를 약 60% 증가시켰다. 상기에 언급한 촉매를 대상으로 질소 흡-탈착, X-ray diffraction (XRD), $H_2$-temperature programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS) 등의 다양한 특성화 분석을 수행하여 촉매의 반응활성과 물성간의 상관관계에 대해 조사하였다.

Keywords

References

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