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Dispersion of supported platinum catalysts in Oxygen

II. Further studies and mechanism of redispersion

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Abstract

Further experimental evidences of redispersion on supported platinum catalysts studied by means of TPR, TPD and cyclohexene hydrogenation reaction. Pt/r-Al2O3 exhibits stronger interaction between the metal oxide and the support as compared with Pt/SiO2 and Pt/TiO2. The formation of surface complex is enhanced as oxidation temperature increases. The TPD spectrum of hydrogen on Pt/TiO2 shifts to higher temperature upon reduction at high temperature and shifts again to its original position upon oxidation. Shift of TPD spectrum does not appear in other catalysts. The suggested mechanism for redispersion is the spreading of platinum oxide and trapping of migrating species.

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Author notes

  1. Tae Jin Lee

    Present address: Department of Chemical Engineering, Yeungnam University, 632, Gyongsan, Korea

Authors and Affiliations

  1. Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, Chongyang, P.O.Box 131, Seoul, Korea

    Tae Jin Lee & Young Gul Kim

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  1. Tae Jin Lee
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  2. Young Gul Kim
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Lee, T.J., Kim, Y.G. Dispersion of supported platinum catalysts in Oxygen. Korean J. Chem. Eng. 2, 119–124 (1985). https://doi.org/10.1007/BF02697497

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  • DOI: https://doi.org/10.1007/BF02697497

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