Ceria Incorporation in Sinter-Resistant Platinum-Based Catalysts

Michael L. Stone; Melissa C. Cendejas; Alex Persson; Gennaro Liccardo; Jacob Smith; Abinash Kumar; Chengshuang Zhou; Evan Gardner; Aisulu Aitbekova; Karen C. Bustillo; Miaofang Chi; Simon R. Bare; Matteo Cargnello

doi:10.1021/acscatal.3c02766

Ceria Incorporation in Sinter-Resistant Platinum-Based Catalysts

Michael L. Stone, Melissa C. Cendejas, Alex Persson, Gennaro Liccardo, Jacob Smith, Abinash Kumar, Chengshuang Zhou, Evan Gardner, Aisulu Aitbekova, Karen C. Bustillo, Miaofang Chi, Simon R. Bare, Matteo Cargnello

electron Microscopy and Microanalysis

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

5 Scopus citations

Abstract

Platinum group metals (PGMs) are widely used for exhaust emission abatement. Sintering during high-temperature emission control conditions decreases noble metal utilization efficiency. Efficient use of scarce noble metals requires sinter-resistant catalysts. Here, we extend an approach to synthesize catalysts consisting of platinum nanoparticles encapsulated in a mixture of cerium and aluminum oxides (Pt@Al₂O₃-CeO₂). We tested the activity of this catalyst toward carbon monoxide, propene, and propane oxidation, chosen as model oxidation reactions for emission control catalysts. Pt@Al₂O₃-CeO₂ catalysts demonstrated similar activity and stability upon aging as the comparison system without ceria, Pt@Al₂O₃, while maintaining small Pt nanoparticles and ceria crystallites. Additionally, we studied the influence of various thermal treatments on the carbon monoxide (CO) oxidation activity and determined that a steam treatment can activate the low-temperature CO oxidation activity of Pt@Al₂O₃-CeO₂. Scanning transmission electron microscope-energy-dispersive X-ray spectroscopy (STEM-EDS) analysis revealed that thermal treatments led to the colocation of Pt and CeO₂, and temperature-programmed reduction analysis revealed that the steam treatment specifically enhanced CO oxidation activity through surface reduction of the CeO₂. In summary, we demonstrate the versatility of this encapsulation approach to generate mixed metal-oxide supports with improved metal-support interactions without hindering the nanoparticle stability.

Original language	English
Pages (from-to)	14853-14863
Number of pages	11
Journal	ACS Catalysis
Volume	13
Issue number	22
DOIs	https://doi.org/10.1021/acscatal.3c02766
State	Published - Nov 17 2023

Funding

This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract no. DE-SC0022197. M.L.S. acknowledges support from a TomKat Postdoctoral Fellowship in Sustainable Energy from the TomKat Center at Stanford University. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The Stanford Synchrotron Radiation Lightsource (SSRL) of SLAC National Accelerator Laboratory was supported by BES under Contract No. DE-AC02-76SF00515. Co-ACCESS was supported by DOE BES Chemical Sciences, Geosciences, and Biosciences Division. Part of the microscopy was performed at the Center for Nanophase Materials Sciences at ORNL, which is a DOE-BES supported user facility. The authors thank the National Science Foundation Division of Materials Research for funding the acquisition of the XPS used in this work (award no. DMR-1828238) and Leah Filardi for assistance with the XPS measurements.

Keywords

catalyst synthesis
emission control
hydrocarbon oxidation
nanocasting
platinum nanoparticles
thermal stability

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10.1021/acscatal.3c02766

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title = "Ceria Incorporation in Sinter-Resistant Platinum-Based Catalysts",

abstract = "Platinum group metals (PGMs) are widely used for exhaust emission abatement. Sintering during high-temperature emission control conditions decreases noble metal utilization efficiency. Efficient use of scarce noble metals requires sinter-resistant catalysts. Here, we extend an approach to synthesize catalysts consisting of platinum nanoparticles encapsulated in a mixture of cerium and aluminum oxides (Pt@Al2O3-CeO2). We tested the activity of this catalyst toward carbon monoxide, propene, and propane oxidation, chosen as model oxidation reactions for emission control catalysts. Pt@Al2O3-CeO2 catalysts demonstrated similar activity and stability upon aging as the comparison system without ceria, Pt@Al2O3, while maintaining small Pt nanoparticles and ceria crystallites. Additionally, we studied the influence of various thermal treatments on the carbon monoxide (CO) oxidation activity and determined that a steam treatment can activate the low-temperature CO oxidation activity of Pt@Al2O3-CeO2. Scanning transmission electron microscope-energy-dispersive X-ray spectroscopy (STEM-EDS) analysis revealed that thermal treatments led to the colocation of Pt and CeO2, and temperature-programmed reduction analysis revealed that the steam treatment specifically enhanced CO oxidation activity through surface reduction of the CeO2. In summary, we demonstrate the versatility of this encapsulation approach to generate mixed metal-oxide supports with improved metal-support interactions without hindering the nanoparticle stability.",

keywords = "catalyst synthesis, emission control, hydrocarbon oxidation, nanocasting, platinum nanoparticles, thermal stability",

author = "Stone, {Michael L.} and Cendejas, {Melissa C.} and Alex Persson and Gennaro Liccardo and Jacob Smith and Abinash Kumar and Chengshuang Zhou and Evan Gardner and Aisulu Aitbekova and Bustillo, {Karen C.} and Miaofang Chi and Bare, {Simon R.} and Matteo Cargnello",

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T1 - Ceria Incorporation in Sinter-Resistant Platinum-Based Catalysts

AU - Stone, Michael L.

AU - Cendejas, Melissa C.

AU - Persson, Alex

AU - Liccardo, Gennaro

AU - Smith, Jacob

AU - Kumar, Abinash

AU - Zhou, Chengshuang

AU - Gardner, Evan

AU - Aitbekova, Aisulu

AU - Bustillo, Karen C.

AU - Chi, Miaofang

AU - Bare, Simon R.

AU - Cargnello, Matteo

PY - 2023/11/17

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N2 - Platinum group metals (PGMs) are widely used for exhaust emission abatement. Sintering during high-temperature emission control conditions decreases noble metal utilization efficiency. Efficient use of scarce noble metals requires sinter-resistant catalysts. Here, we extend an approach to synthesize catalysts consisting of platinum nanoparticles encapsulated in a mixture of cerium and aluminum oxides (Pt@Al2O3-CeO2). We tested the activity of this catalyst toward carbon monoxide, propene, and propane oxidation, chosen as model oxidation reactions for emission control catalysts. Pt@Al2O3-CeO2 catalysts demonstrated similar activity and stability upon aging as the comparison system without ceria, Pt@Al2O3, while maintaining small Pt nanoparticles and ceria crystallites. Additionally, we studied the influence of various thermal treatments on the carbon monoxide (CO) oxidation activity and determined that a steam treatment can activate the low-temperature CO oxidation activity of Pt@Al2O3-CeO2. Scanning transmission electron microscope-energy-dispersive X-ray spectroscopy (STEM-EDS) analysis revealed that thermal treatments led to the colocation of Pt and CeO2, and temperature-programmed reduction analysis revealed that the steam treatment specifically enhanced CO oxidation activity through surface reduction of the CeO2. In summary, we demonstrate the versatility of this encapsulation approach to generate mixed metal-oxide supports with improved metal-support interactions without hindering the nanoparticle stability.

AB - Platinum group metals (PGMs) are widely used for exhaust emission abatement. Sintering during high-temperature emission control conditions decreases noble metal utilization efficiency. Efficient use of scarce noble metals requires sinter-resistant catalysts. Here, we extend an approach to synthesize catalysts consisting of platinum nanoparticles encapsulated in a mixture of cerium and aluminum oxides (Pt@Al2O3-CeO2). We tested the activity of this catalyst toward carbon monoxide, propene, and propane oxidation, chosen as model oxidation reactions for emission control catalysts. Pt@Al2O3-CeO2 catalysts demonstrated similar activity and stability upon aging as the comparison system without ceria, Pt@Al2O3, while maintaining small Pt nanoparticles and ceria crystallites. Additionally, we studied the influence of various thermal treatments on the carbon monoxide (CO) oxidation activity and determined that a steam treatment can activate the low-temperature CO oxidation activity of Pt@Al2O3-CeO2. Scanning transmission electron microscope-energy-dispersive X-ray spectroscopy (STEM-EDS) analysis revealed that thermal treatments led to the colocation of Pt and CeO2, and temperature-programmed reduction analysis revealed that the steam treatment specifically enhanced CO oxidation activity through surface reduction of the CeO2. In summary, we demonstrate the versatility of this encapsulation approach to generate mixed metal-oxide supports with improved metal-support interactions without hindering the nanoparticle stability.

KW - catalyst synthesis

KW - emission control

KW - hydrocarbon oxidation

KW - nanocasting

KW - platinum nanoparticles

KW - thermal stability

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ER -

Ceria Incorporation in Sinter-Resistant Platinum-Based Catalysts

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