Impact of Pd:Pt ratio of Pd/Pt bimetallic catalyst on CH4 oxidation

Jiseok Park; Dongjoon Kim; Sang Woo Byun; Hyeonwoo Shin; Yanggeun Ju; Haehyun Min; Young Jin Kim; Iljeong Heo; Melanie J. Hazlett; Minkyu Kim; Sung Bong Kang

doi:10.1016/j.apcatb.2022.121623

Impact of Pd:Pt ratio of Pd/Pt bimetallic catalyst on CH₄ oxidation

Jiseok Park, Dongjoon Kim, Sang Woo Byun, Hyeonwoo Shin, Yanggeun Ju, Haehyun Min, Young Jin Kim, Iljeong Heo, Melanie J. Hazlett, Minkyu Kim, Sung Bong Kang

Department of Environmental Engineering

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

41 Scopus citations

Abstract

Bimetallic Pd/Pt catalysts have recently attracted considerable attention in controlling emission control of methane. Here, we show the impact of Pd/Pt ratio (1:0, 9:1, 3:1, 1:1, 1:3, 1:9, 0:1) on the catalytic methane oxidation under simulated exhaust environments from the CH₄-rich to -lean feed. Under dry feed conditions, the CH₄ oxidation activity was linear to the Pd:Pt ratio, where the Pd-only (1:0) exhibited the best performance. However, under wet feed conditions containing 5% of water vapor, bimetallic Pd/Pt catalysts having a small fraction of Pt showed superior overall activities in a wide range of reaction environments. The interaction of Pd-Pt, forming active PdO-Pt pair sites, was confirmed by a series of analysis such as STEM-EDS, XPS and H₂-TPR. The evidence by DFT calculations relates the distinct properties of bimetallic Pd/Pt sites to (i) stable CH₄ adsorption, (ii) facile C–H bond cleavage and (iii) weaker adsorption of water on Pt site.

Original language	English
Article number	121623
Journal	Applied Catalysis B: Environmental
Volume	316
DOIs	https://doi.org/10.1016/j.apcatb.2022.121623
State	Published - 5 Nov 2022

Keywords

DFT calculation
Exhaust environment
Methane oxidation
Pd:Pt ratio

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10.1016/j.apcatb.2022.121623

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title = "Impact of Pd:Pt ratio of Pd/Pt bimetallic catalyst on CH4 oxidation",

abstract = "Bimetallic Pd/Pt catalysts have recently attracted considerable attention in controlling emission control of methane. Here, we show the impact of Pd/Pt ratio (1:0, 9:1, 3:1, 1:1, 1:3, 1:9, 0:1) on the catalytic methane oxidation under simulated exhaust environments from the CH4-rich to -lean feed. Under dry feed conditions, the CH4 oxidation activity was linear to the Pd:Pt ratio, where the Pd-only (1:0) exhibited the best performance. However, under wet feed conditions containing 5% of water vapor, bimetallic Pd/Pt catalysts having a small fraction of Pt showed superior overall activities in a wide range of reaction environments. The interaction of Pd-Pt, forming active PdO-Pt pair sites, was confirmed by a series of analysis such as STEM-EDS, XPS and H2-TPR. The evidence by DFT calculations relates the distinct properties of bimetallic Pd/Pt sites to (i) stable CH4 adsorption, (ii) facile C–H bond cleavage and (iii) weaker adsorption of water on Pt site.",

keywords = "DFT calculation, Exhaust environment, Methane oxidation, Pd:Pt ratio",

author = "Jiseok Park and Dongjoon Kim and Byun, {Sang Woo} and Hyeonwoo Shin and Yanggeun Ju and Haehyun Min and Kim, {Young Jin} and Iljeong Heo and Hazlett, {Melanie J.} and Minkyu Kim and Kang, {Sung Bong}",

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year = "2022",

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doi = "10.1016/j.apcatb.2022.121623",

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T1 - Impact of Pd:Pt ratio of Pd/Pt bimetallic catalyst on CH4 oxidation

AU - Park, Jiseok

AU - Kim, Dongjoon

AU - Byun, Sang Woo

AU - Shin, Hyeonwoo

AU - Ju, Yanggeun

AU - Min, Haehyun

AU - Kim, Young Jin

AU - Heo, Iljeong

AU - Hazlett, Melanie J.

AU - Kim, Minkyu

AU - Kang, Sung Bong

PY - 2022/11/5

Y1 - 2022/11/5

N2 - Bimetallic Pd/Pt catalysts have recently attracted considerable attention in controlling emission control of methane. Here, we show the impact of Pd/Pt ratio (1:0, 9:1, 3:1, 1:1, 1:3, 1:9, 0:1) on the catalytic methane oxidation under simulated exhaust environments from the CH4-rich to -lean feed. Under dry feed conditions, the CH4 oxidation activity was linear to the Pd:Pt ratio, where the Pd-only (1:0) exhibited the best performance. However, under wet feed conditions containing 5% of water vapor, bimetallic Pd/Pt catalysts having a small fraction of Pt showed superior overall activities in a wide range of reaction environments. The interaction of Pd-Pt, forming active PdO-Pt pair sites, was confirmed by a series of analysis such as STEM-EDS, XPS and H2-TPR. The evidence by DFT calculations relates the distinct properties of bimetallic Pd/Pt sites to (i) stable CH4 adsorption, (ii) facile C–H bond cleavage and (iii) weaker adsorption of water on Pt site.

AB - Bimetallic Pd/Pt catalysts have recently attracted considerable attention in controlling emission control of methane. Here, we show the impact of Pd/Pt ratio (1:0, 9:1, 3:1, 1:1, 1:3, 1:9, 0:1) on the catalytic methane oxidation under simulated exhaust environments from the CH4-rich to -lean feed. Under dry feed conditions, the CH4 oxidation activity was linear to the Pd:Pt ratio, where the Pd-only (1:0) exhibited the best performance. However, under wet feed conditions containing 5% of water vapor, bimetallic Pd/Pt catalysts having a small fraction of Pt showed superior overall activities in a wide range of reaction environments. The interaction of Pd-Pt, forming active PdO-Pt pair sites, was confirmed by a series of analysis such as STEM-EDS, XPS and H2-TPR. The evidence by DFT calculations relates the distinct properties of bimetallic Pd/Pt sites to (i) stable CH4 adsorption, (ii) facile C–H bond cleavage and (iii) weaker adsorption of water on Pt site.

KW - DFT calculation

KW - Exhaust environment

KW - Methane oxidation

KW - Pd:Pt ratio

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Impact of Pd:Pt ratio of Pd/Pt bimetallic catalyst on CH₄ oxidation

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