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Effects of heat treatments of Pt-loaded Al2O3 on catalytic activities of CO oxidation and combustion-type CO sensors

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Abstract

The effects of heat treatment of Pt-loaded θ-Al2O3 catalysts on the CO-oxidation activity and the CO-sensing properties as catalytic combustion-type gas sensors were examined in this study. The CO-oxidation activity of the Pt-loaded θ-Al2O3 heat treated in wet N2 was larger than that in dry air or in dry H2, and the Pt-loaded θ-Al2O3 heat treated in wet N2 completely oxidized CO to CO2 even at 20 °C. We also clarified that the heat treatment of the Pt-loaded θ-Al2O3 heat treated in wet N2 exhibited the smallest size of Pt particles and the smallest concentration of residual chlorine among the examined catalysts. However, the sensitivity of the sensor using the Pt-loaded θ-Al2O3 heat treated in wet N2 was smaller than that of the sensor using the Pt-loaded θ-Al2O3 heat treated in dry air, because the heat generated by the CO oxidation over the Pt-loaded θ-Al2O3 heat treated in wet N2 appeared mainly at the upper part of the catalyst film and it may ineffectively conduct to the negative temperature coefficient (NTC) thermistor. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) revealed that the heat treatment of the Pt-loaded θ-Al2O3 in wet N2 obviously increased the CO adsorption on the Pt surface and enhanced the CO-oxidation activity.

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Acknowledgements

We are grateful to TDK Corporation for providing the NTC thermistors and the analysis of residual chlorine components in the catalysts by ion chromatography.

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Authors and Affiliations

  1. Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-Machi, Nagasaki, 852-8521, Japan

    Taro Ueda, Takumi Matsuo, Takeo Hyodo & Yasuhiro Shimizu

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  1. Taro Ueda
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  2. Takumi Matsuo
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Contributions

TU contributed to conceptualization; TU and TM contributed to experimental design; TM carried out measurements; TU and TH contributed to manuscript composition; TH and YS contributed to writing-review and editing; YS contributed to supervision. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Taro Ueda.

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Ueda, T., Matsuo, T., Hyodo, T. et al. Effects of heat treatments of Pt-loaded Al2O3 on catalytic activities of CO oxidation and combustion-type CO sensors. J Mater Sci 58, 9459–9472 (2023). https://doi.org/10.1007/s10853-023-08655-5

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  • DOI: https://doi.org/10.1007/s10853-023-08655-5

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