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Role of the TiO2 Crystalline Phase in Pt-TiO2 for Thermocatalytic Mineralization of Gaseous Acetaldehyde
https://orcid.org/0000-0002-3862-5298
https://orcid.org/0000-0003-1801-9386
https://orcid.org/0000-0002-8130-5441
https://orcid.org/0000-0003-4358-1442
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.
Role of the TiO2 Crystalline Phase in Pt-TiO2 for Thermocatalytic Mineralization of Gaseous Acetaldehyde
https://orcid.org/0000-0002-3862-5298
https://orcid.org/0000-0003-1801-9386
https://orcid.org/0000-0002-8130-5441
https://orcid.org/0000-0003-4358-1442
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.
Role of the TiO2 Crystalline Phase in Pt-TiO2 for Thermocatalytic Mineralization of Gaseous Acetaldehyde
https://orcid.org/0000-0002-3862-5298
https://orcid.org/0000-0003-1801-9386
https://orcid.org/0000-0002-8130-5441
https://orcid.org/0000-0003-4358-1442
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.
Role of the TiO2 Crystalline Phase in Pt-TiO2 for Thermocatalytic Mineralization of Gaseous Acetaldehyde
Lee, Minhyung (author) / Kim, Bupmo (author) / Kim, Suho (author) / Kim, Hwan (author) / Park, Minjun (author) / Choi, Wonyong (author) / Kim, Wooyul (author) / Kim, Hyoung-il (author)
ACS ES&T Engineering ; 5 ; 743-755
2025-03-14
Article (Journal)
Electronic Resource
English
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