Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Ag-Loaded LaSrCoFeO3 Perovskite Nano-Fibrous Web for Effective Soot Oxidation

Ag 담지된 LaSrCoFeO3 섬유상 perovskite 촉매의 탄소 입자상 물질의 산화반응

  • Lee, Chanmin (Research Institute of Sustainable Manufacturing System, Intelligent Sustainable Materials R&D Group, Korea Institute of Industrial Technology) ;
  • Jeon, Yukwon (School of Chemistry, University of St Andrews) ;
  • Hwang, Ho Jung (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Ji, Yunseong (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Kwon, Ohchan (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Jeon, Ok Sung (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Shul, Yong-Gun (Department of Chemical and Biomolecular Engineering, Yonsei University)
  • 이찬민 (한국생산기술연구원 청정생산시스템연구소 지능형청정소재 그룹) ;
  • 전유권 ;
  • 황호정 (연세대학교 화공생명공학과) ;
  • 지윤성 (연세대학교 화공생명공학과) ;
  • 권오찬 (연세대학교 화공생명공학과) ;
  • 전옥성 (연세대학교 화공생명공학과) ;
  • 설용건 (연세대학교 화공생명공학과)
  • Received : 2019.03.04
  • Accepted : 2019.04.10
  • Published : 2019.08.01
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Abstract

The catalytic combustion of particulate matter (PM) is one of the key technologies to meet emission standards of diesel engine system. Therefore, we herein suggest Ag loaded $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$ perovskite web catalyst. They were produced by the electrospinning method. FE-SEM, EDS mapping, XRD, XPS were studied to investigate the crystal and morphological structures of loaded Ag particles and $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$ perovskite web catalyst. Following the catalytic soot oxidation, we found that the Ag loaded $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$ perovskiteweb catalyst showed the higher catalytic activities (e.g., $T_{50}=490^{\circ}C$) than the only $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$ perovskite web catalyst (e.g., $T_{50}=586^{\circ}C$). Thus, this finding suggests that Ag loaded $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$ perovskite web catalyst can be a promising candidate for enhancing the soot oxidation.

디젤엔진 시스템은 미세먼지 배출의 엄격해진 저감/제어 기준을 충족하기 위해서 산화촉매는 매우 중요한 기술 중에 하나이다. 본 연구에서는 효율적인 soot산화의 촉매로 Ag 나노입자가 loading된 $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$ 섬유상 web 촉매를 제시하였다. 제조된 촉매는 FE-SEM, EDS mapping, XRD, XPS 분석을 통해 특성을 평가하였다. Soot 산화성능측정결과 Ag의 효율적인 촉매특성과 증가된 soot입자와 표면의 접촉면적으로 인하여 50% 산화온도 평가($T_{50}=490^{\circ}C$)에서 자연적인 산화보다 $151^{\circ}C$ 가속화된 것을 확인하였다. 따라서 Ag가 loading된 촉매와 3차원적인 web 구조는 soot 산화에 효율적인 촉매후보군으로 확인하였다.

Keywords

HHGHHL_2019_v57n4_584_f0001.png 이미지

Fig. 1. SEM images of electro-spun nanofibers and fiber diameter distribution: (a-c) LaSrCoFe/PVP nanofibers web and (d-f) La0.6Sr0.4Co0.2Fe0.8O3 perovskite nanofibrous web calcined at 800 ℃.

HHGHHL_2019_v57n4_584_f0002.png 이미지

Fig. 2. SEM and EDS mapping images of 4.5 wt% Ag loaded La0.6Sr0.4Co0.2Fe0.8O3 perovskite nanofibrous web.

HHGHHL_2019_v57n4_584_f0003.png 이미지

Fig. 3. XRD patterns of 4.5 wt% Ag loaded La0.6Sr0.4Co0.2Fe0.8O3 and only La0.6Sr0.4Co0.2Fe0.8O3 perovskite nanofibrous webs.

HHGHHL_2019_v57n4_584_f0004.png 이미지

Fig. 4. XPS spectra of 4.5 wt% Ag loaded La0.6Sr0.4Co0.2Fe0.8O3 and only La0.6Sr0.4Co0.2Fe0.8O3 perovskite nanofibrous webs.

HHGHHL_2019_v57n4_584_f0005.png 이미지

Fig. 5. Thermo-gravimetric analysis (TGA) results for soot oxidation of mixture (catalyst and soot): 4.5 wt% Ag loaded La0.6Sr0.4Co0.2Fe0.8O3 nanofibrous web, La0.6Sr0.4Co0.2Fe0.8O3 nanofibrous web and only carbon black.

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