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Dispersion Improvement of Platinum Catalysts Supported on Silica, Silica-Alumina and Alumina by Titania Incorporation and pH Adjustment

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Abstract

Platinum catalysts supported on silica, silica-alumina and alumina supports were prepared using four different cationic and anionic platinum precursors in order to examine the contribution of the precursors and supports to the platinum dispersion. The pH adjustment of the precursor suspension to obtain an opposing surface charge of the support to that on the platinum precursor ions considerably improved the platinum dispersion by strengthening their adsorption on the support. However, exceptional platinum dispersion was achieved, regardless of the precursor and support, by simultaneous pH adjustment and titania incorporation on the supports. The increase in the interaction between the platinum precursor and the titania-incorporated support raised the dispersion and stability of the platinum catalysts with high-loading, even after reduction at 400 °C. The physico-chemical states of platinum and titanium were investigated by XRD, TEM, XAFS spectroscopy and CO adsorption technique. The platinum catalysts supported on the titania-incorporated supports with pH adjustment exhibited highly dispersed platinum particles ranging in size from 1 to 3 nm. They also exhibited high catalytic activity in the oxidation of carbon monoxide because of its incorporated titania and partially oxidized, small platinum particles.

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Acknowledgments

This work was a part of the project “Development of Partial Zero Emission Technology for Future Vehicles” funded by the Ministry of Knowledge Economy and we are grateful for the financial support received. We also acknowledged the Pohang Accelerator Laboratory (PAL) for the XAFS measurement.

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Authors and Affiliations

  1. School of Applied Chemical Engineering and The Research Institute for Catalysis, Chonnam National University, 300 Yongbong-Dong, Buk-Gu, Gwangju, 500-757, Republic of Korea

    Mi-Young Kim & Gon Seo

  2. Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk, 361-763, Republic of Korea

    Jung-Hyun Park & Chae-Ho Shin

  3. Division of Science Education, Chonbuk National University, Jeonju, Chonbuk, 561-756, Republic of Korea

    Sang-Wook Han

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  1. Mi-Young Kim
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  2. Jung-Hyun Park
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  3. Chae-Ho Shin
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  4. Sang-Wook Han
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  5. Gon Seo
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Correspondence to Gon Seo.

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Kim, MY., Park, JH., Shin, CH. et al. Dispersion Improvement of Platinum Catalysts Supported on Silica, Silica-Alumina and Alumina by Titania Incorporation and pH Adjustment. Catal Lett 133, 288–297 (2009). https://doi.org/10.1007/s10562-009-0188-4

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  • DOI: https://doi.org/10.1007/s10562-009-0188-4

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