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Received February 10, 2009
Accepted February 25, 2009
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Keggin형 및 Wells-Dawson형 헤테로폴리산 촉매의 STM 연구
STM Studies of Keggin-type and Wells-Dawson-type Heteropolyacid Catalysts
삼성 SDS Thought Leadership Center, 463-870 경기도 성남시 분당구 구미동 159-9 1델라웨어대학교 화학공학과, 19716 미국 델라웨어주 뉴왁시 아카데미로 150 2서울대학교 화학생물공학부, 151-744 서울시 관악구 신림동 산56-1
Thought Leadership Center, Samsung SDS, 159-9 Gumi-Dong, Bundang-Gu, Seongnam-Si, Gyeonggi-Do 463-870, Korea 1Department of Chemical Engineering, University of Delaware, 150 Academy Street, Newark, Delaware 19716, U.S.A., USA 2School of Chemical & Biological Engineering, Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, Seoul 151-744, Korea
inksong@snu.ac.kr
Korean Chemical Engineering Research, April 2009, 47(2), 163-168(6), NONE Epub 6 May 2009
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Abstract
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.
Keywords
References
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