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  • 1 School of Applied Chemical Engineering and the Research Institute for Catalysis, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea
  • 2 Department of Chemical Engineering, Chungbuk National University, 52 Seongbong-ro, Heungdeok-gu, Cheongju Chungbuk 361-763, Republic of Korea
  • 3 Korea Basic Science Institute Gwangju Center, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea
  • 4 Pohang Accelerator Laboratory, San-31 Hyoja-dong, Pohang, Kyungbuk, 790-784, Republic of Korea
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Abstract

Platinum catalysts supported on silicas with various physicochemical properties were prepared in order to investigate the effect of silica characteristics on their platinum dispersion and catalytic activity in the oxidation of carbon monoxide. Although titania-incorporation into silica and further treatment of the impregnated platinum precursor with hydrogen peroxide were effective for improving the dispersion and stability of platinum catalysts supported on silicas, regardless of the characteristic of the silicas, the platinum catalysts supported on fumed silica with a medium level of surface hydroxyl group concentration exhibited the highest catalytic activity among those supported on mesoporous silica, silica gel, and precipitated silica. The required properties of the highly active platinum catalyst seemed to be a high dispersion of platinum, the formation of a stable titania layer, and the generation of strong acid sites. By contrast, the precipitated silica with a small surface area and high concentration of surface hydroxyl groups was not appropriate for a catalytic support for platinum catalysts.

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