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Suppression of Noble Metal Sintering Based on the Support Anchoring Effect and its Application in Automotive Three-Way Catalysis

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Abstract

Suppression of noble metal sintering is a very important approach in the development of automotive three-way catalysts. The investigation into the Pt sintering behavior revealed that the formed Pt–O–M (M: cation of oxide, i.e., cerium oxide) bond acted as an anchor to suppress the Pt sintering, and that the strength of the Pt-oxide-support interaction was well correlated with the electron density of oxygen in the support oxide. To achieve a good balance between catalytic activity and the sintering suppression, ceria based oxide support was verified to be suitable for Pt, and zirconia based oxide support was appropriate support for Rh. Through optimizing the configuration of Pt and Rh in the catalyst, a novel three-way catalyst was developed successfully, and this catalytic activity is far superior to the conventional catalyst, but with lower noble metal content.

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Authors and Affiliations

  1. Toyota Central R&D Labs Inc, Nagakute, 480-1192, Aichi, Japan

    Hirofumi Shinjoh, Miho Hatanaka, Yasutaka Nagai, Toshitaka Tanabe & Naoki Takahashi

  2. Toyota Motor Corporation, Toyota, 471-8572, Aichi, Japan

    Takeru Yoshida & Yoshiharu Miyake

Authors
  1. Hirofumi Shinjoh
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  2. Miho Hatanaka
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  3. Yasutaka Nagai
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  4. Toshitaka Tanabe
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  5. Naoki Takahashi
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  6. Takeru Yoshida
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  7. Yoshiharu Miyake
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Correspondence to Hirofumi Shinjoh.

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Shinjoh, H., Hatanaka, M., Nagai, Y. et al. Suppression of Noble Metal Sintering Based on the Support Anchoring Effect and its Application in Automotive Three-Way Catalysis. Top Catal 52, 1967–1971 (2009). https://doi.org/10.1007/s11244-009-9371-5

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  • DOI: https://doi.org/10.1007/s11244-009-9371-5

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