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Tuning Pt dispersion and oxygen mobility of Pt/γ-Al2O3 by Si addition for CO oxidation

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Abstract

γ-Al2O3 was doped with TEOS solution to obtain SiO2 content in the range of 0.6–12.4 wt%. Pt dispersion was effectively enhanced by 82 and 45 % by doping 0.6 and 1.2 wt% SiO2, and was slightly declined afterward. However, oxygen mobility as described by the reduction of basicity was monotonically decreased with increasing SiO2 content. The results from CO oxidation tests reveal a linear relationship between TOFs and desorbed-CO2. It is suggested that oxygen mobility plays a distinct role in controlling the surface reaction between CO and O surface species, which were activated by different adjacent Pt clusters. The highly dispersed Pt catalysts obtained by this technique can also be applied to other structure-insensitive reactions such as propane dehydrogenation.

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Acknowledgments

We would like to thank the financial supports from The Royal Golden Jubilee Ph.D. scholarship of Thailand Research Fund for N. C. (Grant No. PHD/0246/2552). The Ratchadaphiseksomphot Endowment Fund of Chulalongkorn University (CU-56-654-AM) is also gratefully acknowledged.

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Authors and Affiliations

  1. Department of Chemical Engineering, Faculty of Engineering, Center of Excellence on Catalysis and Catalytic Reaction Engineering, Chulalongkorn University, Bangkok, 10330, Thailand

    Nutchapon Chotigkrai, Yuthana Hochin, Joongjai Panpranot & Piyasan Praserthdam

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  1. Nutchapon Chotigkrai
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  2. Yuthana Hochin
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  3. Joongjai Panpranot
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  4. Piyasan Praserthdam
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Correspondence to Piyasan Praserthdam.

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Chotigkrai, N., Hochin, Y., Panpranot, J. et al. Tuning Pt dispersion and oxygen mobility of Pt/γ-Al2O3 by Si addition for CO oxidation. Reac Kinet Mech Cat 117, 565–581 (2016). https://doi.org/10.1007/s11144-015-0969-2

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