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Effect of water treatment and Ce doping of Pt/Al2O3 catalysts on Pt sintering and propane oxidation

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Abstract

The effect of Ce doping and pretreatment of Pt/Al2O3 on its catalysis of propane oxidation was investigated after aging the catalysts. The Ce amount and pretreatment conditions were varied, and the propane oxidation activity was measured. The properties of the catalysts were investigated by means of XRD, STEM-EDX, FT-IR, and H2-TPR. The size of the Pt nanoparticles (PtNPs) decreased for water-treated catalysts doped with a small amount of Ce, suggesting that water treatment of Ce-doped catalysts inhibits Pt sintering. The minimum PtNP size was obtained with ca. 3.6 wt% of Ce. The Ce species with less than 3.6 wt% existed in a dispersed state, whereas above this value, CeO2 particulates co-existed. The propane oxidation temperature of the water-treated catalysts was lowered to an extent that depended on the Ce content. This tendency is consistent with the PtNP size in the catalysts. It is considered that highly dispersed Ce species take a primary role in promoting propane oxidation on PtNPs. The reduction temperature of Ce species on water-treated catalysts was lower than that of untreated catalysts, probably owing to a stronger interaction between Pt and Ce, demonstrated by FT-IR measurements. The increased reducibility of Ce species may be the reason for the improved oxidation activity of the catalysts.

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Acknowledgments

This work was partly supported by JSPS KAKENHI Grant Numbers JP26420790 and JP19K05159.

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Authors and Affiliations

  1. National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, 463-8560, Japan

    Atsuko Tomita, Takeshi Miki & Yutaka Tai

Authors
  1. Atsuko Tomita
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  2. Takeshi Miki
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  3. Yutaka Tai
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Contributions

AT was involved in conceptualization, methodology, investigation, writing—original draft preparation, funding acquisition. TM contributed to methodology, investigation, writing—review and editing. YT was involved in conceptualization, writing—review and editing.

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Correspondence to Atsuko Tomita.

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Tomita, A., Miki, T. & Tai, Y. Effect of water treatment and Ce doping of Pt/Al2O3 catalysts on Pt sintering and propane oxidation. Res Chem Intermed 47, 2935–2950 (2021). https://doi.org/10.1007/s11164-021-04449-z

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