Inhibition of water-gas shift reaction activity of oxide-supported Pt catalyst by H2 and CO2

Jaeha Lee; Eunwon Lee; Do Heui Kim

doi:10.1016/j.ijhydene.2022.08.203

Inhibition of water-gas shift reaction activity of oxide-supported Pt catalyst by H₂ and CO₂

Jaeha Lee, Eunwon Lee, Do Heui Kim

Department of Applied Chemistry

Seoul National University

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

4 Scopus citations

Abstract

A catalyst composed of platinum-group metals supported on an oxide exhibits high activity in a low-temperature water-gas shift (LT-WGS) reaction; however, the reaction rate is greatly reduced when H₂ or CO₂, the product gases of the WGS reaction, are included in the reactant stream. In this study, we attempted to understand the origin of this activity inhibition by analyzing the kinetic data with in-situ CO-diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The WGS reaction rate decreases more severely by H₂ than CO₂. The CO-DRIFTS spectra indicate that this can be explained by H₂ preoccupying the active sites for the WGS reaction. In addition, by comparing the kinetic data with the literature, it could be inferred that a similar inhibition mechanism is operating in other oxide-supported Pt catalysts. Considering this inhibition mechanism will be important for the development of catalysts with high WGS activity in reformate gas.

Original language	English
Pages (from-to)	24574-24579
Number of pages	6
Journal	International Journal of Hydrogen Energy
Volume	48
Issue number	64
DOIs	https://doi.org/10.1016/j.ijhydene.2022.08.203
State	Published - 29 Jul 2023

Keywords

Activity inhibition
Low-temperature water-gas shift reaction
Reformate gas

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10.1016/j.ijhydene.2022.08.203

Cite this

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title = "Inhibition of water-gas shift reaction activity of oxide-supported Pt catalyst by H2 and CO2",

abstract = "A catalyst composed of platinum-group metals supported on an oxide exhibits high activity in a low-temperature water-gas shift (LT-WGS) reaction; however, the reaction rate is greatly reduced when H2 or CO2, the product gases of the WGS reaction, are included in the reactant stream. In this study, we attempted to understand the origin of this activity inhibition by analyzing the kinetic data with in-situ CO-diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The WGS reaction rate decreases more severely by H2 than CO2. The CO-DRIFTS spectra indicate that this can be explained by H2 preoccupying the active sites for the WGS reaction. In addition, by comparing the kinetic data with the literature, it could be inferred that a similar inhibition mechanism is operating in other oxide-supported Pt catalysts. Considering this inhibition mechanism will be important for the development of catalysts with high WGS activity in reformate gas.",

keywords = "Activity inhibition, Low-temperature water-gas shift reaction, Reformate gas",

author = "Jaeha Lee and Eunwon Lee and Kim, {Do Heui}",

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AU - Kim, Do Heui

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Y1 - 2023/7/29

N2 - A catalyst composed of platinum-group metals supported on an oxide exhibits high activity in a low-temperature water-gas shift (LT-WGS) reaction; however, the reaction rate is greatly reduced when H2 or CO2, the product gases of the WGS reaction, are included in the reactant stream. In this study, we attempted to understand the origin of this activity inhibition by analyzing the kinetic data with in-situ CO-diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The WGS reaction rate decreases more severely by H2 than CO2. The CO-DRIFTS spectra indicate that this can be explained by H2 preoccupying the active sites for the WGS reaction. In addition, by comparing the kinetic data with the literature, it could be inferred that a similar inhibition mechanism is operating in other oxide-supported Pt catalysts. Considering this inhibition mechanism will be important for the development of catalysts with high WGS activity in reformate gas.

AB - A catalyst composed of platinum-group metals supported on an oxide exhibits high activity in a low-temperature water-gas shift (LT-WGS) reaction; however, the reaction rate is greatly reduced when H2 or CO2, the product gases of the WGS reaction, are included in the reactant stream. In this study, we attempted to understand the origin of this activity inhibition by analyzing the kinetic data with in-situ CO-diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The WGS reaction rate decreases more severely by H2 than CO2. The CO-DRIFTS spectra indicate that this can be explained by H2 preoccupying the active sites for the WGS reaction. In addition, by comparing the kinetic data with the literature, it could be inferred that a similar inhibition mechanism is operating in other oxide-supported Pt catalysts. Considering this inhibition mechanism will be important for the development of catalysts with high WGS activity in reformate gas.

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