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Role of the TiO2 Crystalline Phase in Pt-TiO2 for Thermocatalytic Mineralization of Gaseous Acetaldehyde

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    Role of the TiO2 Crystalline Phase in Pt-TiO2 for Thermocatalytic Mineralization of Gaseous Acetaldehyde
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    • Minhyung Lee
      Minhyung Lee
      Department of Civil & Environmental Engineering, Yonsei University, Seoul 03722, Republic of Korea
      More by Minhyung Lee
      Orcidhttps://orcid.org/0000-0002-3862-5298
    • Bupmo Kim
      Bupmo Kim
      Department of Energy Engineering, Korea Institute of Energy Technology (KENTECH), Naju 58330, Republic of Korea
      More by Bupmo Kim
    • Suho Kim
      Suho Kim
      Department of Civil & Environmental Engineering, Yonsei University, Seoul 03722, Republic of Korea
      Department of Construction Test & Certification Center, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Republic of Korea
      More by Suho Kim
    • Hwan Kim
      Hwan Kim
      Department of Civil & Environmental Engineering, Yonsei University, Seoul 03722, Republic of Korea
      Environmental Technology Division, Korea Testing Laboratory, Seoul 08389, Republic of Korea
      More by Hwan Kim
    • Minjun Park
      Minjun Park
      Department of Civil & Environmental Engineering, Yonsei University, Seoul 03722, Republic of Korea
      More by Minjun Park
    • Wonyong Choi
      Wonyong Choi
      Department of Energy Engineering, Korea Institute of Energy Technology (KENTECH), Naju 58330, Republic of Korea
      More by Wonyong Choi
      Orcidhttps://orcid.org/0000-0003-1801-9386
    • Wooyul Kim*
      Wooyul Kim
      Department of Energy Engineering, Korea Institute of Energy Technology (KENTECH), Naju 58330, Republic of Korea
      *Email: [email protected]
      More by Wooyul Kim
      Orcidhttps://orcid.org/0000-0002-8130-5441
    • Hyoung-il Kim*
      Hyoung-il Kim
      Department of Civil & Environmental Engineering, Yonsei University, Seoul 03722, Republic of Korea
      Future City Open Innovation Center, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
      *Email: [email protected]
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      Orcidhttps://orcid.org/0000-0003-4358-1442
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    ACS ES&T Engineering

    Cite this: ACS EST Engg. 2025, 5, 3, 743–755
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    https://doi.org/10.1021/acsestengg.4c00654
    Published December 16, 2024
    Copyright © 2024 American Chemical Society
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    Abstract

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    Pt-TiO2 is an efficient low-temperature thermocatalyst for volatile organic compound (VOC) removal, driven by active oxygen species formation through metal–support interactions. While the role of Pt is well established, the influence of TiO2 polymorphs on active oxygen generation is less understood. This study explores the thermocatalytic removal of acetaldehyde (CH3CHO) over Pt supported on three TiO2 polymorphs: anatase, rutile, and brookite. CH3CHO mineralization at 160 °C follows the trend: Pt-anatase (99.5%) > Pt-rutile (79.3%) > Pt-brookite (56.7%). These differences correlate with the oxygen adsorption and active oxygen generation capabilities, as evidenced by electrochemical analyses and O2-temperature-programmed desorption. Density functional theory calculations further indicate that Pt supported on anatase has the highest negative charge density, which significantly enhances the formation of active oxygen species. In situ FTIR spectroscopy provides additional evidence by revealing distinct CH3CHO oxidation pathways: *HCOOH on Pt-anatase and Pt-brookite, and *CH3COOH on Pt-rutile. Despite sharing a similar pathway, Pt-anatase displayed faster kinetics due to a higher abundance of surface-active oxygen species. This study highlights the pivotal role of TiO2 polymorphs in shaping metal–support interactions and provides critical insights for designing efficient Pt-based catalysts for thermocatalytic VOC abatement.

    Copyright © 2024 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/acsestengg.4c00654.

    • Materials; catalyst preparation; catalytic activity measurements; characterization methods; electrochemical analysis; in situ FTIR spectroscopic analysis; TPD measurements; and details of DFT calculations (PDF)

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    ACS ES&T Engineering

    Cite this: ACS EST Engg. 2025, 5, 3, 743–755
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsestengg.4c00654
    Published December 16, 2024
    Copyright © 2024 American Chemical Society
    Request reuse permissions

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