Influence of the strategy for mixing Pd/La-Al2O3 and Pd/Ce0.5Zr0.5O2 on the activity of three-way catalysts

Zhao, Han; Li, Hongcheng; Tan, Yuanlong; Liu, Tianzhi; Zhang, Huifeng; Zhang, Qingde; Chen, Hangrong; Zhao, Yaohua; Liu, Xiao Yan

doi:10.1016/j.apcata.2022.118597

Cited by 10 publications

(1 citation statement)

References 41 publications

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“…The migration of PGMs in TWCs has been reported by several research groups. ,− It depends not only on the types of PGM/support and their interactions but also on the temperature, gas atmosphere, and sintering stage. It is also suggested that the metal loading density and/or the distance between neighboring metal nanoparticles affect their migration behavior. , As the vapor transport of Rh was negligible in the present study (Table ), the observed Rh distribution should be determined by solid-state migration processes.…”

Section: Resultsmentioning

confidence: 99%

Rh Nanoparticles Dispersed on ZrO₂–CeO₂ Migrate to Al₂O₃ Supports to Mitigate Thermal Deactivation via Encapsulation

Machida

Yoshida

Kamiuchi

et al. 2023

ACS Appl. Nano Mater.

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Full-scale monolithic three-way catalysts (TWCs) comprising Rh, oxygen-scavenging ZrO2–CeO2 (ZC), and γ-Al2O3 as a binder component were studied after real engine aging. The fatal irreversible deactivation that occurred under stoichiometric-lean-rich perturbation at 1000 °C for 40 h (SLR aging) was attributed to the complete encapsulation of Rh nanoparticles by ZC, leading to the physical blockage of gas adsorption. Preaging the catalyst under a rich condition at 1000 °C for 40 h (R aging) drastically mitigated this deactivation, i.e., the catalyst with R–SLR combined aging sustained its catalytic performance much better than the catalyst with SLR aging at the same temperature (1000 °C) and total time (80 h). X-ray mapping and high-temperature environmental electron microscopic analyses suggested that R aging promoted the migration of Rh nanoparticles across the ZC surface toward the boundary with the Al2O3 binder. Owing to the strong bonding with the Al2O3 surface, Rh nanoparticles were trapped at or near the boundary. Consequently, these Rh nanoparticles were unlikely to be fully covered by ZC even under the SLR aging condition because the encapsulation was induced through repetitive oxygen release/storage cycles at the Rh/ZC interface. Thus, we propose that Rh nanoparticles in contact with ZC and Al2O3 played crucial roles to hinder the encapsulation caused by SLR aging at 1000 °C. Rh nanoparticles supported on the dual-oxide support of ZC and Al2O3 were subjected to engine aging and chassis dynamometer tests. The deterioration extents of the TWC and oxygen storage capacity performances were successfully mitigated using this dual-oxide support formulation.

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Section: Resultsmentioning

confidence: 99%

Rh Nanoparticles Dispersed on ZrO₂–CeO₂ Migrate to Al₂O₃ Supports to Mitigate Thermal Deactivation via Encapsulation

Machida

Yoshida

Kamiuchi

et al. 2023

ACS Appl. Nano Mater.

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The strengthened Pd-(CeO2-ZrO2) interaction by κ-Ce2Zr2O8 and the improved three-way catalytic performance

Deng

et al. 2022

Applied Catalysis A: General

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Strong metal-support interaction (SMSI) in environmental catalysis: Mechanisms, application, regulation strategies, and breakthroughs

Qi,

Peng,

Liang

et al. 2024

Environmental Science and Ecotechnology

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Influence of the strategy for mixing Pd/La-Al2O3 and Pd/Ce0.5Zr0.5O2 on the activity of three-way catalysts

Cited by 10 publications

References 41 publications

Rh Nanoparticles Dispersed on ZrO₂–CeO₂ Migrate to Al₂O₃ Supports to Mitigate Thermal Deactivation via Encapsulation

Rh Nanoparticles Dispersed on ZrO₂–CeO₂ Migrate to Al₂O₃ Supports to Mitigate Thermal Deactivation via Encapsulation

The strengthened Pd-(CeO2-ZrO2) interaction by κ-Ce2Zr2O8 and the improved three-way catalytic performance

Strong metal-support interaction (SMSI) in environmental catalysis: Mechanisms, application, regulation strategies, and breakthroughs

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Influence of the strategy for mixing Pd/La-Al2O3 and Pd/Ce0.5Zr0.5O2 on the activity of three-way catalysts

Cited by 10 publications

References 41 publications

Rh Nanoparticles Dispersed on ZrO2–CeO2 Migrate to Al2O3 Supports to Mitigate Thermal Deactivation via Encapsulation

Rh Nanoparticles Dispersed on ZrO2–CeO2 Migrate to Al2O3 Supports to Mitigate Thermal Deactivation via Encapsulation

The strengthened Pd-(CeO2-ZrO2) interaction by κ-Ce2Zr2O8 and the improved three-way catalytic performance

Strong metal-support interaction (SMSI) in environmental catalysis: Mechanisms, application, regulation strategies, and breakthroughs

Contact Info

Product

Resources

About

Rh Nanoparticles Dispersed on ZrO₂–CeO₂ Migrate to Al₂O₃ Supports to Mitigate Thermal Deactivation via Encapsulation

Rh Nanoparticles Dispersed on ZrO₂–CeO₂ Migrate to Al₂O₃ Supports to Mitigate Thermal Deactivation via Encapsulation