Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Dispersion and Stability of Platinum Catalysts Supported on Titania-, Vanadia-, Zirconia- and Ceria-Incorporated Silicas

티타니아, 바나디아, 지르코니아, 세리아를 고정한 실리카에 담지된 백금 촉매의 분산성과 안정성

  • Kim, Mi-Young (School of Applied Chemical Engineering and The Research Institute for Catalysis, Chonnam National University) ;
  • Seo, Gon (School of Applied Chemical Engineering and The Research Institute for Catalysis, Chonnam National University) ;
  • Park, Jung-Hyun (Department of Chemical Engineering, Chungbuk National University) ;
  • Shin, Chae-Ho (Department of Chemical Engineering, Chungbuk National University) ;
  • Kim, Eun-Seok (Heesung Catalysts Corp.)
  • 김미영 (전남대학교 응용화학공학부, 전남대학교 촉매연구소) ;
  • 서곤 (전남대학교 응용화학공학부, 전남대학교 촉매연구소) ;
  • 박정현 (충북대학교 화학공학과) ;
  • 신채호 (충북대학교 화학공학과) ;
  • 김은석 (희성촉매주식회사)
  • Published : 2011.01.30
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Abstract

Platinum catalysts were prepared by impregnating platinum precursor on titania-, vanadia-, zirconia- and ceria-incorporated silicas followed by hydrogen peroxide treatment. The effects of the oxide incorporation and the hydrogen peroxide treatment in the preparation of the platinum catalysts on their platinum dispersion and catalytic activity in carbon monoxide oxidation were investigated. XRD, TEM, EXAFS, XPS and carbon monoxide chemisorption studies confirmed the high dispersion of platinum even on silica by the oxide incorporation and hydrogen peroxide treatment. However, the type of oxides incorporated on silica caused considerable variances in the adsorption and the catalytic activity in the oxidation of carbon monoxide on them. The incorporation of titania, zirconia and ceria on silica and further hydrogen peroxide treatment enhanced the platinum dispersion, resulting in the improved catalytic activities. Among the catalysts supported on the oxide-incorporated silicas, the platinum catalyst supported on zirconia-incorporated silica exhibited the highest activity because of the highest platinum dispersion due to the formation of Pt-O-Zr bonds.

티타니아, 바나디아, 지르코니아, 세리아를 고정한 실리카에 백금을 담지한 후 과산화수소로 처리하여 제조한 백금 촉매에서 산화물 고정과 과산화수소 처리가 백금의 분산 상태 및 일산화탄소 산화반응에서 이들의 촉매 활성에 미치는 영향을 조사하였다. 산화물을 고정하고 과산화수소로 처리하면 실리카에도 백금이 잘 분산될 수 있음을 XRD, TEM, EXAFS, XPS, 일산화탄소 화학흡착 방법으로 검증하였다. 그러나 일산화탄소의 흡착성질과 일산화탄소 산화반응에서 촉매 활성은 고정한 산화물 종류에 따라 상당히 달랐다. 티타니아, 지르코니아, 세리아를 실리카에 고정하고 과산화수소로 처리하여 제조한 백금 촉매에서는 백금의 분산도가 높아져서 일산화탄소 산화반응에서 활성이 증진되었다. Pt-O-Zr 결합이 생성되어 백금의 분산도가 크게 향상된 지르코니아 고정 백금 촉매에서 산화물 고정과 과산화수소 처리로 인한 활성 증진 효과가 가장 컸다.

Keywords

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