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Effective Improvement of Pt Catalyst for Exhaust Gas Purification by Using the Highly Crystallized CeO2 as an Additive

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Abstract

Over the last few decades, Pd-based three-way catalysts (TWCs) have been more extensively used than Pt-based TWCs because of their higher thermal stability. In this study, the addition of CeO2 to a Pt-based TWC was performed to improve the reductivity and dispersion of Pt particles after aging at 1000 °C. The aged dispersion of the Pt-loaded CeO2 was much higher than that of a commonly used La2O3–CeO2–ZrO2 catalyst. Furthermore, the hydrogen temperature-programmed reduction conducted on Pt/CeO2 revealed that the Pt-loaded highly crystalline CeO2 (HC–CeO2) exhibited a higher reductivity as compared with that of the high surface area CeO2 (HS–CeO2). Adding a small amount of HC–CeO2 to the Pt-based TWC increased both the Pt dispersion and reductivity after aging. Owing to the high dispersion and reductivity of Pt, Rh/Pt-based TWCs with HC–CeO2 used as an additive to the Pt catalyst layer demonstrated a higher catalytic activity than that of the Rh/Pd-based TWCs even after aging at 1000 °C in an exhaust gas.

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Data Availability

The datasets analyzed during this study are referenced in the text and publicly available.

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Authors and Affiliations

  1. Mitsui Mining & Smelting Co., Ltd., Ageoshimo 1013-1, Ageo, 362-0025, Japan

    H. Tanaka, I. Morita, Y. Nagao, Y. Endo & T. Wakabayashi

  2. Advanced Ceramics Research Center, Nagoya Institute of Technology, Asahigaoka 10-6-29, Tajimi, 507-0071, Japan

    H. Tanaka & M. Haneda

Authors
  1. H. Tanaka
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  2. I. Morita
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  3. Y. Nagao
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  4. Y. Endo
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  5. T. Wakabayashi
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  6. M. Haneda
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Correspondence to T. Wakabayashi or M. Haneda.

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Tanaka, H., Morita, I., Nagao, Y. et al. Effective Improvement of Pt Catalyst for Exhaust Gas Purification by Using the Highly Crystallized CeO2 as an Additive. Top Catal 66, 908–914 (2023). https://doi.org/10.1007/s11244-022-01745-9

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  • DOI: https://doi.org/10.1007/s11244-022-01745-9

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