Designing ultrastable Pt/CeO2-Al2O3 nanosheet catalysts for three-way catalysts applications

Junjie Chen; Chih Han Liu; Hien N. Pham; Todd J. Toops; Abhaya K. Datye; Eleni A. Kyriakidou

doi:10.1016/j.cej.2023.147086

Designing ultrastable Pt/CeO₂-Al₂O₃ nanosheet catalysts for three-way catalysts applications

Junjie Chen, Chih Han Liu, Hien N. Pham, Todd J. Toops, Abhaya K. Datye, Eleni A. Kyriakidou

Applied Catalysis&Emissions Res. Group

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

Designing Rh-free, especially Pt-only, three-way catalysts with improved low-temperature activity/stability is highly desirable. Herein, we demonstrate that ultrastable Pt/CeO₂-Al₂O₃ nanosheet catalysts can be obtained based on a Sabatier principle of metal-support interaction. Tuning the surface coverage of penta-site rich γ-Al₂O₃ nanosheets (AlNS, weak adhesion to Pt) by CeO₂ “nano-islands” (strong adhesion to Pt) can lead to the synthesis of Pt/60 wt.%CeO₂-AlNS that have lower light-off temperatures for CO, hydrocarbons, and NO compared to conventional Pt/CeO₂ and Pt/Al₂O₃ catalysts by 100–200 °C and a similar performance with the state-of-the-art Rh-based catalyst. Incorporating CeO₂ on the surface of AlNS can retard the sintering of CeO₂ during harsh redox hydrothermal aging, associate with the strong interaction between CeO₂ “nano-island” and penta-site rich γ-Al₂O₃ nanosheets. Moreover, the improved activity/stability of Pt/CeO₂-AlNS catalysts can be attributed to tuning of the Pt detachment and migration from and back to the CeO₂ “nano-islands”, respectively, that keeps Pt as nanoclusters on CeO₂, the most active species for three-way catalyst applications.

Original language	English
Article number	147086
Journal	Chemical Engineering Journal
Volume	477
DOIs	https://doi.org/10.1016/j.cej.2023.147086
State	Published - Dec 1 2023

Funding

The UB authors were partially supported by start-up funding from the UB Department of Chemical and Biological Engineering. A portion of this research was funded by U.S. Department of Energy, Vehicle Technologies Office via the Oak Ridge National Laboratory and from Washington State University, with special thanks to Gurpreet Singh and Siddiq Khan. Acquisition of the TEM was supported by NSF MRI grant DMR-1828731. Junjie Chen acknowledges the support from Prof. Thomas F. Jaramillo.

Keywords

Heterogeneous catalysis
Metal-support interaction
Sabatier principle
Three-way catalyst

Access to Document

10.1016/j.cej.2023.147086

Cite this

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title = "Designing ultrastable Pt/CeO2-Al2O3 nanosheet catalysts for three-way catalysts applications",

abstract = "Designing Rh-free, especially Pt-only, three-way catalysts with improved low-temperature activity/stability is highly desirable. Herein, we demonstrate that ultrastable Pt/CeO2-Al2O3 nanosheet catalysts can be obtained based on a Sabatier principle of metal-support interaction. Tuning the surface coverage of penta-site rich γ-Al2O3 nanosheets (AlNS, weak adhesion to Pt) by CeO2 “nano-islands” (strong adhesion to Pt) can lead to the synthesis of Pt/60 wt.%CeO2-AlNS that have lower light-off temperatures for CO, hydrocarbons, and NO compared to conventional Pt/CeO2 and Pt/Al2O3 catalysts by 100–200 °C and a similar performance with the state-of-the-art Rh-based catalyst. Incorporating CeO2 on the surface of AlNS can retard the sintering of CeO2 during harsh redox hydrothermal aging, associate with the strong interaction between CeO2 “nano-island” and penta-site rich γ-Al2O3 nanosheets. Moreover, the improved activity/stability of Pt/CeO2-AlNS catalysts can be attributed to tuning of the Pt detachment and migration from and back to the CeO2 “nano-islands”, respectively, that keeps Pt as nanoclusters on CeO2, the most active species for three-way catalyst applications.",

keywords = "Heterogeneous catalysis, Metal-support interaction, Sabatier principle, Three-way catalyst",

author = "Junjie Chen and Liu, {Chih Han} and Pham, {Hien N.} and Toops, {Todd J.} and Datye, {Abhaya K.} and Kyriakidou, {Eleni A.}",

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AU - Liu, Chih Han

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AU - Datye, Abhaya K.

AU - Kyriakidou, Eleni A.

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