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Operando Spectroscopic Observation of CO Oxidation on a Pt/TiO2 Catalyst in NO–CO Mixtures under Dark and UV Illumination

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    Catalysis and Kinetics

    Operando Spectroscopic Observation of CO Oxidation on a Pt/TiO2 Catalyst in NO–CO Mixtures under Dark and UV Illumination
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    • Cheolwoo Park
      Cheolwoo Park
      Department of Energy Engineering/KENTECH Institute for Environmental and Climate Technology, Korea Institute of Energy Technology (KENTECH), Naju, Jeollanam-do 58330, Republic of Korea
      Department of Energy Science, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
      R&D Center, SN Co., Ltd., Ansan, Gyeonggi-do 15657, Republic of Korea
      More by Cheolwoo Park
    • Ji Young Hwang
      Ji Young Hwang
      Department of Energy Engineering/KENTECH Institute for Environmental and Climate Technology, Korea Institute of Energy Technology (KENTECH), Naju, Jeollanam-do 58330, Republic of Korea
      More by Ji Young Hwang
    • Won Hyun Eom
      Won Hyun Eom
      R&D Center, SN Co., Ltd., Ansan, Gyeonggi-do 15657, Republic of Korea
      More by Won Hyun Eom
    • Jae Won Han
      Jae Won Han
      R&D Center, SN Co., Ltd., Ansan, Gyeonggi-do 15657, Republic of Korea
      More by Jae Won Han
    • Hyo Won Kim
      Hyo Won Kim
      Department of Energy Engineering/KENTECH Institute for Environmental and Climate Technology, Korea Institute of Energy Technology (KENTECH), Naju, Jeollanam-do 58330, Republic of Korea
      More by Hyo Won Kim
      Orcidhttps://orcid.org/0000-0001-7385-796X
    • Tae Kyu Ahn
      Tae Kyu Ahn
      Department of Energy Science, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
      More by Tae Kyu Ahn
      Orcidhttps://orcid.org/0000-0002-7474-6513
    • Wooyul Kim*
      Wooyul Kim
      Department of Energy Engineering/KENTECH Institute for Environmental and Climate Technology, Korea Institute of Energy Technology (KENTECH), Naju, Jeollanam-do 58330, Republic of Korea
      *E-mail: [email protected]
      More by Wooyul Kim
      Orcidhttps://orcid.org/0000-0002-8130-5441
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    Energy & Fuels

    Cite this: Energy Fuels 2022, 36, 16, 9243–9250
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    https://doi.org/10.1021/acs.energyfuels.2c01933
    Published July 28, 2022
    Copyright © 2022 American Chemical Society
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    Abstract

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    The importance of catalytic CO oxidation for exhaust gas processing has inspired the development of efficient and durable catalysts that can be operated at low temperatures, as exemplified by supported noble metals. However, most of the related studies have neglected the potential effects of co-present exhaust gas components, such as NO. Herein, we compared the performances of platinized and bare TiO2 for the ambient-temperature (photo)catalytic oxidation of CO by O2 in the co-presence of NO and used in situ Fourier transform infrared spectroscopy to elucidate the effects of platinization on the efficiency and mechanism of this oxidation. Catalytic CO oxidation was accompanied by competitive NO oxidation both in the dark and under ultraviolet (UV) illumination. In the dark, Pt/TiO2 achieved a higher CO removal efficiency than bare TiO2, which was ascribed to the enhanced adsorption of O2 and CO and the inhibition of NO overoxidation (mainly the oxidation of the monodentate nitrito form to the bidentate nitrate form). Under UV illumination, Pt/TiO2 efficiently promoted CO oxidation at photocatalytically active sites (Pt0–CO) by suppressing NO overoxidation and increasing the reduction of NO to N2O. Hence, the enhanced CO oxidation performance of Pt/TiO2 was due to its ability to control NO oxidation and reduction at ambient temperature, which presents a new strategy for the design of low-temperature CO oxidation catalysts.

    Copyright © 2022 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.energyfuels.2c01933.

    • Calibration curves, supplementary characterizations (DRS and XPS), and supporting data (schematic diagrams, gas-phase in situ FTIR spectra, and time traces of products) as noted in the main text (PDF)

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    Cited By

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    This article is cited by 4 publications.

    1. Zhenru Zhang, Subhash Chandra Shit, Hyo Won Kim, Tae Kyu Ahn, Wooyul Kim. Engineering Pt single atom catalysts on titania nanotubes via the photo/electrochemical pathway for a selective ammonia oxidation reaction. Applied Surface Science 2025, 685 , 162049. https://doi.org/10.1016/j.apsusc.2024.162049
    2. Zhenru Zhang, Cheolwoo Park, Sunghyun Noh, Hyo Won Kim, Tae Kyu Ahn, Wooyul Kim. Selective photocatalytic reduction of nitric oxide to dinitrogen via bimetallic bond incorporation. Chemical Engineering Journal 2024, 499 , 156569. https://doi.org/10.1016/j.cej.2024.156569
    3. Lang Wang, Yarong Bai, Haiqiang Wang, Zhongbiao Wu. Simple solid mixed Pt/TiO2-ZrO2 catalyst for CO oxidation with excellent sulfur and water resistance at relatively low temperature. Fuel 2024, 371 , 131904. https://doi.org/10.1016/j.fuel.2024.131904
    4. Xiaoxiao Han, Lingling Zhang, Rui Zhang, Ke Wang, Xiao Wang, Bo Li, Zhiping Tao, Shuyan Song, Hongjie Zhang. Boosting the catalytic performance of Al 2 O 3 -supported Pd catalysts by introducing CeO 2 promoters. Dalton Transactions 2024, 53 (7) , 3290-3295. https://doi.org/10.1039/D3DT03676F
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    Energy & Fuels

    Cite this: Energy Fuels 2022, 36, 16, 9243–9250
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.energyfuels.2c01933
    Published July 28, 2022
    Copyright © 2022 American Chemical Society
    Request reuse permissions

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