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Received July 9, 2010
Accepted July 23, 2010
Available online February 9, 2011
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티타니아, 바나디아, 지르코니아, 세리아를 고정한 실리카에 담지된 백금 촉매의 분산성과 안정성
Dispersion and Stability of Platinum Catalysts Supported on Titania-, Vanadia-, Zirconia- and Ceria-Incorporated Silicas
전남대학교 응용화학공학부 촉매연구소, 500-757 광주광역시 북구 용봉동 300 1충북대학교 화학공학과, 361-763 충북 청주시 흥덕구 성봉로 410 2희성촉매주식회사, 429-450 경기도 시흥시 정왕동 1251-6
School of Applied Chemical Engineering and The Research Institute for Catalysis, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Korea 1Department of Chemical Engineering, Chungbuk National University, 410 Seongbong-ro, Heungduk-gu, Cheongju-si, Chungbuk 361-763, Korea 2Heesung Catalysts Corp., 1251-6 Jeongwang-dong, Shihung-si, Geonggi 429-450, Korea
gseo@chonnam.ac.kr
Korean Chemical Engineering Research, February 2011, 49(1), 1-9(9)
https://doi.org/NONE
https://doi.org/NONE
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Abstract
티타니아, 바나디아, 지르코니아, 세리아를 고정한 실리카에 백금을 담지한 후 과산화수소로 처리하여 제조한 백금촉매에서 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-OZr 결합이 생성되어 백금의 분산도가 크게 향상된 지르코니아 고정 백금 촉매에서 산화물 고정과 과산화수소 처리로_x000D_
인한 활성 증진 효과가 가장 컸다.
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.
Keywords
References
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Jochuma W, Ederb D, Kaltenhausera G, Kramer R, Top. Catal., 46, 49 (2007)
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Geobaldo F, Bordiga S, Zecchina A, Gianello E, Leofanti G, Petrini G, Catal. Lett., 16, 109 (1992)
Giamello E, Rumori P, Geobaldo F, Fubini B, Paganini M, Appl. Magn. Reson., 10, 173 (1996)
Neumann R, Levinelad M, Appl. Catal. A: Gen., 122(2), 85 (1995)
Aboukais A, Zhilinskaya EA, Lamonier JF, Filimonov IN, Colloid Surf. A-Physicochem. Eng. Asp., 260, 199 (2005)
Swatsitang E, Krochai M, J. Met. Mater. Miner., 19, 91 (2009)
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Maniguet S, Mathew RJ, Russell AE, J. Phys. Chem. B, 104(9), 1998 (2000)
Koningsberger DC, Gates BC, Catal. Lett., 14, 271 (1992)
Silvestre-Albero J, Coloma F, Sepulveda-Escribano A, Rodriguez-Reinoso F, Appl. Catal. A: Gen., 304(1), 159 (2006)
Silvestre-Albero J, Sepulveda-Escribano A, Rodriguez-Reinoso F, Anderson JA, J. Catal., 223(1), 179 (2004)
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Graf PO, de Vlieger DJM, Mojet BL, Lefferts L, J. Catal., 262(2), 181 (2009)
