Alleviating inhibitory effect of H2 on low-temperature water-gas shift reaction activity of Pt/CeO2 catalyst by forming CeO2 nano-patches on Pt nano-particles

Jaeha Lee; Dongjae Shin; Eunwon Lee; Chengbin Li; Ji Man Kim; Jeong Woo Han; Do Heui Kim

doi:10.1016/j.apcatb.2021.121038

Alleviating inhibitory effect of H₂ on low-temperature water-gas shift reaction activity of Pt/CeO₂ catalyst by forming CeO₂ nano-patches on Pt nano-particles

Jaeha Lee, Dongjae Shin, Eunwon Lee, Chengbin Li, Ji Man Kim, Jeong Woo Han, Do Heui Kim

Department of Applied Chemistry

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

25 Scopus citations

Abstract

Pt/CeO₂ has gained much attention for their high activity in low-temperature (LT) water-gas shift (WGS) reaction. However, the inclusion of H₂ in the feed as in the practical reaction condition significantly degrades the LT-WGS activity of the Pt/CeO₂ catalysts. In this contribution, the activity of Pt/CeO₂ catalyst under the feed gas containing excess H₂ (20 vol% of H₂) was enhanced more than three times by forming CeO₂ nano-patches on Pt nano-particles. Both in-situ diffuse reflectance infrared Fourier transform spectroscopy and density functional theory calculation results indicate that dissociated H₂ on the Pt nano-particle inhibits the activity of the Pt/CeO₂ catalysts by occupying the active sites (Pt nano-particle-CeO₂ interface). On the other hand, thin CeO₂ nano-patches on Pt nano-particle suppressed the H₂ dissociation. As a result, the WGS reactivity of the active Pt nano-particle-CeO₂ interface was less affected by H₂, granting the catalysts the high activity under the practical reaction conditions.

Original language	English
Article number	121038
Journal	Applied Catalysis B: Environmental
Volume	305
DOIs	https://doi.org/10.1016/j.apcatb.2021.121038
State	Published - 15 May 2022

Keywords

CeO nano-patch
Excess H
In-situ diffuse reflectance infrared Fourier transform spectroscopy
Low temperature water-gas shift reaction
Pt nano-particle

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10.1016/j.apcatb.2021.121038

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title = "Alleviating inhibitory effect of H2 on low-temperature water-gas shift reaction activity of Pt/CeO2 catalyst by forming CeO2 nano-patches on Pt nano-particles",

abstract = "Pt/CeO2 has gained much attention for their high activity in low-temperature (LT) water-gas shift (WGS) reaction. However, the inclusion of H2 in the feed as in the practical reaction condition significantly degrades the LT-WGS activity of the Pt/CeO2 catalysts. In this contribution, the activity of Pt/CeO2 catalyst under the feed gas containing excess H2 (20 vol% of H2) was enhanced more than three times by forming CeO2 nano-patches on Pt nano-particles. Both in-situ diffuse reflectance infrared Fourier transform spectroscopy and density functional theory calculation results indicate that dissociated H2 on the Pt nano-particle inhibits the activity of the Pt/CeO2 catalysts by occupying the active sites (Pt nano-particle-CeO2 interface). On the other hand, thin CeO2 nano-patches on Pt nano-particle suppressed the H2 dissociation. As a result, the WGS reactivity of the active Pt nano-particle-CeO2 interface was less affected by H2, granting the catalysts the high activity under the practical reaction conditions.",

keywords = "CeO nano-patch, Excess H, In-situ diffuse reflectance infrared Fourier transform spectroscopy, Low temperature water-gas shift reaction, Pt nano-particle",

author = "Jaeha Lee and Dongjae Shin and Eunwon Lee and Chengbin Li and Kim, {Ji Man} and Han, {Jeong Woo} and Kim, {Do Heui}",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2022",

month = may,

day = "15",

doi = "10.1016/j.apcatb.2021.121038",

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T1 - Alleviating inhibitory effect of H2 on low-temperature water-gas shift reaction activity of Pt/CeO2 catalyst by forming CeO2 nano-patches on Pt nano-particles

AU - Lee, Jaeha

AU - Shin, Dongjae

AU - Lee, Eunwon

AU - Li, Chengbin

AU - Kim, Ji Man

AU - Han, Jeong Woo

AU - Kim, Do Heui

PY - 2022/5/15

Y1 - 2022/5/15

N2 - Pt/CeO2 has gained much attention for their high activity in low-temperature (LT) water-gas shift (WGS) reaction. However, the inclusion of H2 in the feed as in the practical reaction condition significantly degrades the LT-WGS activity of the Pt/CeO2 catalysts. In this contribution, the activity of Pt/CeO2 catalyst under the feed gas containing excess H2 (20 vol% of H2) was enhanced more than three times by forming CeO2 nano-patches on Pt nano-particles. Both in-situ diffuse reflectance infrared Fourier transform spectroscopy and density functional theory calculation results indicate that dissociated H2 on the Pt nano-particle inhibits the activity of the Pt/CeO2 catalysts by occupying the active sites (Pt nano-particle-CeO2 interface). On the other hand, thin CeO2 nano-patches on Pt nano-particle suppressed the H2 dissociation. As a result, the WGS reactivity of the active Pt nano-particle-CeO2 interface was less affected by H2, granting the catalysts the high activity under the practical reaction conditions.

AB - Pt/CeO2 has gained much attention for their high activity in low-temperature (LT) water-gas shift (WGS) reaction. However, the inclusion of H2 in the feed as in the practical reaction condition significantly degrades the LT-WGS activity of the Pt/CeO2 catalysts. In this contribution, the activity of Pt/CeO2 catalyst under the feed gas containing excess H2 (20 vol% of H2) was enhanced more than three times by forming CeO2 nano-patches on Pt nano-particles. Both in-situ diffuse reflectance infrared Fourier transform spectroscopy and density functional theory calculation results indicate that dissociated H2 on the Pt nano-particle inhibits the activity of the Pt/CeO2 catalysts by occupying the active sites (Pt nano-particle-CeO2 interface). On the other hand, thin CeO2 nano-patches on Pt nano-particle suppressed the H2 dissociation. As a result, the WGS reactivity of the active Pt nano-particle-CeO2 interface was less affected by H2, granting the catalysts the high activity under the practical reaction conditions.

KW - CeO nano-patch

KW - Excess H

KW - In-situ diffuse reflectance infrared Fourier transform spectroscopy

KW - Low temperature water-gas shift reaction

KW - Pt nano-particle

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DO - 10.1016/j.apcatb.2021.121038

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SN - 0926-3373

VL - 305

JO - Applied Catalysis B: Environmental

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ER -

Alleviating inhibitory effect of H₂ on low-temperature water-gas shift reaction activity of Pt/CeO₂ catalyst by forming CeO₂ nano-patches on Pt nano-particles

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