Korean Chemical Engineering Research

  • 제47권2호
  • /
  • Pages.163-168
  • /
  • 2009
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  • 0304-128X(pISSN)
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  • 2233-9558(eISSN)
한국화학공학회 (The Korean Institute of Chemical Engineers)
권호 표지

Keggin 형 및 Wells-Dawson 형 헤테로폴리산 촉매의 STM 연구

STM Studies of Keggin-type and Wells-Dawson-type Heteropolyacid Catalysts

  • 박교익 (삼성 SDS Thought Leadership Center) ;
  • 마크 바토 (델라웨어대학교 화학공학과) ;
  • 정지철 (서울대학교 화학생물공학부) ;
  • 송인규 (서울대학교 화학생물공학부)
  • Park, Gyo Ik (Thought Leadership Center, Samsung SDS) ;
  • Barteau, Mark A. (Department of Chemical Engineering, University of Delaware) ;
  • Jung, Ji Chul (School of Chemical & Biological Engineering, Seoul National University) ;
  • Song, In Kyu (School of Chemical & Biological Engineering, Seoul National University)
  • 투고 : 2009.02.10
  • 심사 : 2009.02.25
  • 발행 : 2009.04.30
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초록

본 연구에서는 양이온, 중심원소, 배위원소가 치환된 Keggin 형 및 Wells-Dawson 형 헤테로폴리산 촉매의 NDR(negative differential resistance) 거동을 STM(scanning tunneling microscopy)을 이용하여 살펴보았다. 헤테로폴리산 촉매의 NDR 전압과 산화환원능력 사이에는 일정한 상관관계가 있었다. 촉매의 구조적 차이에 상관없이 산화환원능력이 높은 헤테로폴리산 촉매는 보다 낮은 음전압에서 NDR 거동을 나타내었다. 이처럼 NDR 전압은 촉매의 산화환원능력을 대변하는 하나의 correlating parameter로 활용될 수 있었다.

Negative differential resistance(NDR) behaviors of Keggin-type and Wells-Dawson-type heteropolyacids with cation, heteroatom, and polyatom substitutions were investigated by scanning tunneling microscopy. A reliable correlation between NDR peak voltage and reduction potential of heteropolyacid catalysts was established. It was found that more reducible heteropolyacid catalyst showed NDR behavior at less negative voltage, regardless of the structural difference. Thus, NDR peak voltage of heteropolyacid catalyst could be utilized as a single correlating parameter for the reduction potential of heteropolyacid catalyst.

키워드

과제정보

연구 과제 주관 기관 : 한국학술진흥재단

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