CO oxidation activity of Pt/CeO2 catalysts below 0 °C: platinum loading effects

Andrei I. Boronin; Elena M. Slavinskaya; Alberto Figueroba; Andrey I. Stadnichenko; Tatyana Yu Kardash; Olga A. Stonkus; Elizaveta A. Fedorova; Valerii V. Muravev; Valery A. Svetlichnyi; Albert Bruix; Konstantin M. Neyman

doi:10.1016/j.apcatb.2021.119931

CO oxidation activity of Pt/CeO₂ catalysts below 0 °C: platinum loading effects

Andrei I. Boronin (Corresponding author), Elena M. Slavinskaya, Alberto Figueroba, Andrey I. Stadnichenko, Tatyana Yu Kardash, Olga A. Stonkus, Elizaveta A. Fedorova, Valerii V. Muravev, Valery A. Svetlichnyi, Albert Bruix, Konstantin M. Neyman (Corresponding author)

Inorganic Materials & Catalysis

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

107 Citations (Scopus)

Abstract

Reducing the operating temperature of oxidation catalysts is important for designing energy efficient processes, extending catalyst lifetime, and abating pollutants, especially in cold climates. Herein, high CO oxidation activity at sub-ambient temperatures is reported for Pt/CeO₂ catalysts with high content of Pt in the form of dispersed Pt²⁺ and Pt⁴⁺ centers. Whereas the reference 1 wt%Pt catalyst was active for CO oxidation only above 100ᵒC, the 8 and 20 wt%Pt catalysts converted 60 and 90 % of CO, respectively, below 0ᵒC. Ionic platinum was shown to facilitate oxygen release from ceria and lower the light-off temperature of the reaction occurring through the Mars-van-Krevelen mechanism. However, the remarkable activity observed at sub-ambient temperatures for the ≥8 wt%Pt catalysts is proposed to involve O₂ and CO reactants weakly adsorbed on PtO_x clusters. The synergies between ionic platinum and nanostructured ceria reported in this work advance the knowledge-driven design of catalysts for low-temperature oxidation reactions.

Original language	English
Article number	119931
Number of pages	19
Journal	Applied Catalysis. B, Environmental
Volume	286
DOIs	https://doi.org/10.1016/j.apcatb.2021.119931
Publication status	Published - 5 Jun 2021

Funding

This work was supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental order for Boreskov Institute of Catalysis (project АААА-А21-121011390053-4). AB and KMN gratefully acknowledge support by the Spanish government grants PGC2018-093863-B-C22 , MDM-2017-0767 , PRX17/00348 and the grants 2018BP00190 and 2017SGR13 of the Generalitat de Catalunya . They also thank the Red Española de Supercomputación for providing computer resources as well as the European Cooperation in Science and Technology program via the COST Action CA18234 for stimulating the present study.

Keywords

DFT calculations
Low-temperature CO oxidation
Pt/CeO
PtO
Single atom

Access to Document

10.1016/j.apcatb.2021.119931

Cite this

Boronin, A. I., Slavinskaya, E. M., Figueroba, A., Stadnichenko, A. I., Kardash, T. Y., Stonkus, O. A., Fedorova, E. A., Muravev, V. V., Svetlichnyi, V. A., Bruix, A., & Neyman, K. M. (2021). CO oxidation activity of Pt/CeO₂ catalysts below 0 °C: platinum loading effects. Applied Catalysis. B, Environmental, 286, Article 119931. https://doi.org/10.1016/j.apcatb.2021.119931

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abstract = "Reducing the operating temperature of oxidation catalysts is important for designing energy efficient processes, extending catalyst lifetime, and abating pollutants, especially in cold climates. Herein, high CO oxidation activity at sub-ambient temperatures is reported for Pt/CeO2 catalysts with high content of Pt in the form of dispersed Pt2+ and Pt4+ centers. Whereas the reference 1 wt%Pt catalyst was active for CO oxidation only above 100ᵒC, the 8 and 20 wt%Pt catalysts converted 60 and 90 % of CO, respectively, below 0ᵒC. Ionic platinum was shown to facilitate oxygen release from ceria and lower the light-off temperature of the reaction occurring through the Mars-van-Krevelen mechanism. However, the remarkable activity observed at sub-ambient temperatures for the ≥8 wt%Pt catalysts is proposed to involve O2 and CO reactants weakly adsorbed on PtOx clusters. The synergies between ionic platinum and nanostructured ceria reported in this work advance the knowledge-driven design of catalysts for low-temperature oxidation reactions.",

keywords = "DFT calculations, Low-temperature CO oxidation, Pt/CeO, PtO, Single atom",

author = "Boronin, {Andrei I.} and Slavinskaya, {Elena M.} and Alberto Figueroba and Stadnichenko, {Andrey I.} and Kardash, {Tatyana Yu} and Stonkus, {Olga A.} and Fedorova, {Elizaveta A.} and Muravev, {Valerii V.} and Svetlichnyi, {Valery A.} and Albert Bruix and Neyman, {Konstantin M.}",

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AU - Kardash, Tatyana Yu

AU - Stonkus, Olga A.

AU - Fedorova, Elizaveta A.

AU - Muravev, Valerii V.

AU - Svetlichnyi, Valery A.

AU - Bruix, Albert

AU - Neyman, Konstantin M.

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N2 - Reducing the operating temperature of oxidation catalysts is important for designing energy efficient processes, extending catalyst lifetime, and abating pollutants, especially in cold climates. Herein, high CO oxidation activity at sub-ambient temperatures is reported for Pt/CeO2 catalysts with high content of Pt in the form of dispersed Pt2+ and Pt4+ centers. Whereas the reference 1 wt%Pt catalyst was active for CO oxidation only above 100ᵒC, the 8 and 20 wt%Pt catalysts converted 60 and 90 % of CO, respectively, below 0ᵒC. Ionic platinum was shown to facilitate oxygen release from ceria and lower the light-off temperature of the reaction occurring through the Mars-van-Krevelen mechanism. However, the remarkable activity observed at sub-ambient temperatures for the ≥8 wt%Pt catalysts is proposed to involve O2 and CO reactants weakly adsorbed on PtOx clusters. The synergies between ionic platinum and nanostructured ceria reported in this work advance the knowledge-driven design of catalysts for low-temperature oxidation reactions.

AB - Reducing the operating temperature of oxidation catalysts is important for designing energy efficient processes, extending catalyst lifetime, and abating pollutants, especially in cold climates. Herein, high CO oxidation activity at sub-ambient temperatures is reported for Pt/CeO2 catalysts with high content of Pt in the form of dispersed Pt2+ and Pt4+ centers. Whereas the reference 1 wt%Pt catalyst was active for CO oxidation only above 100ᵒC, the 8 and 20 wt%Pt catalysts converted 60 and 90 % of CO, respectively, below 0ᵒC. Ionic platinum was shown to facilitate oxygen release from ceria and lower the light-off temperature of the reaction occurring through the Mars-van-Krevelen mechanism. However, the remarkable activity observed at sub-ambient temperatures for the ≥8 wt%Pt catalysts is proposed to involve O2 and CO reactants weakly adsorbed on PtOx clusters. The synergies between ionic platinum and nanostructured ceria reported in this work advance the knowledge-driven design of catalysts for low-temperature oxidation reactions.

KW - DFT calculations

KW - Low-temperature CO oxidation

KW - Pt/CeO

KW - PtO

KW - Single atom

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