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

Boronin, Andrei I.; Slavinskaya, Elena M.; Figueroba, Alberto; Stadnichenko, A. I.; Kardash, T. Yu.; Стонкус, О. А.; Fedorova, Elizaveta A.; Muravev, Valery; Svetlichnyi, V. A.; Bruix, Albert; Neyman, Konstantin M.

doi:10.1016/j.apcatb.2021.119931

Cited by 99 publications

(66 citation statements)

References 129 publications

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“…Boronin et al recently reported a CO oxidation reactivity below 0 °C over 20 wt % Pt supported on CeO 2 ; however, the catalyst became inactive below 100 °C if the amount of Pt was decreased to 1 wt %. 22 oxidation, a rare study has been reported with a mechanistic understanding of HCHO oxidation on Pt-CeO 2 catalysts. The oxidation of CO and HCHO involves a stream of catalytic steps including CO/HCHO adsorption, O 2 adsorption and activation, and oxidation of adsorbed molecules/ intermediates, which may happen on the same site and compete with other steps to slow down the whole process.…”

Section: Introductionmentioning

confidence: 99%

Tuning Metal–Support Interaction of Pt-CeO₂ Catalysts for Enhanced Oxidation Reactivity

Zhang

Qin

Chu

et al. 2021

Environ. Sci. Technol.

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Metal–support interaction (MSI) has been widely recognized to be playing a pivotal role in regulating the catalytic activity of various reactions. In this work, the degree of MSI between Pt and CeO2 support was finely tuned by adjusting the activation condition, and the obtained catalysts were tested for the oxidative abatement of CO and HCHO under ambient conditions. The characterization of catalysts shows that activation of strongly interacting Pt-CeO2 at higher temperatures by H2 leads to a weaker MSI with increased electron density of Pt, and this modification of local electronic properties is demonstrated to result in enhanced O2 adsorption/activation to prevent the CO self-poisoning effect, while it abates the activity of CO adsorption/activation and oxidation of adsorbed CO. The Pt-CeO2 catalyst with a moderate MSI, which is able to balance each step in the catalytic cycle over Pt and Pt-CeO2 interface domains, displays the highest activity for CO/HCHO oxidation under ambient conditions.

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Section: Introductionmentioning

confidence: 99%

Tuning Metal–Support Interaction of Pt-CeO₂ Catalysts for Enhanced Oxidation Reactivity

Zhang

Qin

Chu

et al. 2021

Environ. Sci. Technol.

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“…Note that the specially designed hopcalites operate under wet conditions within a few tens of minutes [31,43] . In the case of Pt/CeO 2 catalyst the adding of H 2 O in the reaction mixture may result in the decrease or increase of activity depending on the H 2 O concentration, Pt content, and pretreatment conditions [44,45] …”

Section: Resultsmentioning

confidence: 99%

Delafossite Ag₂CuMnO₄ is a Novel Catalytic Material for Low‐Temperature Oxidation of CO and NH₃

et al. 2021

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Ternary oxide of silver, copper, and manganese (Ag2CuMnO4) was prepared by hydrothermal synthesis in an alkaline solution. The prepared sample was characterized by a delafossite crystal structure without any other crystallized phases. The catalytic properties of Ag2CuMnO4 in oxidation reactions using molecular oxygen were investigated. High catalytic activity was found for Ag2CuMnO4 in the CO oxidation at room temperature, while ammonia oxidation occurred above 100 °C. Ammonia oxidation resulted in the formation of N2O/N2 or NO/NO2 products depending on the reaction temperature. As a result of the reaction exposure on Ag2CuMnO4 during heating up to 400 °C, a modification of surface composition with preservation of the delafossite structure was found. Oxide Ag2CuMnO4 was shown to be operating in wet CO oxidation under ambient conditions. Obtained data emphasize that Ag2CuMnO4 can be considered as a novel and prospective catalytic material with a high potential of application for oxidation processes at low temperatures including ambient conditions.

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“…Ceria, as a component of catalysts containing transition metals (M) Pd or Ag, is used in numerous applications ranging from the abatement of soot, volatile organic compounds, and CO [1-10] to the production of syngas [11] and CO 2 activation [12,13]. As an active reducible support, ceria facilitates the dispersion of metals and MO x phases on the surface [7,[14][15][16][17] and provides lattice O atoms to oxidise reactants [2,9,[17][18][19][20]. For instance, the interactions within Pd-ceria interfaces allow the synergistic oxidation/reduction of both subsystems [21], promote the oxidation of CO by lattice O atoms, and the oxidation of the reduced ceria by O atoms of CO 2 [22].…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Oxidation of CO on Ceria Nanoparticles Exposing Single-Atom Pd and Ag: A DFT Modelling

et al. 2021

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Various COx species formed upon the adsorption and oxidation of CO on palladium and silver single atoms supported on a model ceria nanoparticle (NP) have been studied using density functional calculations. For both metals M, the ceria-supported MCOx moieties are found to be stabilised in the order MCO < MCO2 < MCO3, similar to the trend for COx species adsorbed on M-free ceria NP. Nevertheless, the characteristics of the palladium and silver intermediates are different. Very weak CO adsorption and the small exothermicity of the CO to CO2 transformation are found for O4Pd site of the Pd/Ce21O42 model featuring a square-planar coordination of the Pd2+ cation. The removal of one O atom and formation of the O3Pd site resulted in a notable strengthening of CO adsorption and increased the exothermicity of the CO to CO2 reaction. For the analogous ceria models with atomic Ag instead of atomic Pd, these two energies became twice as small in magnitude and basically independent of the presence of an O vacancy near the Ag atom. CO2-species are strongly bound in palladium carboxylate complexes, whereas the CO2 molecule easily desorbs from oxide-supported AgCO2 moieties. Opposite to metal-free ceria particle, the formation of neither PdCO3 nor AgCO3 carbonate intermediates before CO2 desorption is predicted. Overall, CO oxidation is concluded to be more favourable at Ag centres atomically dispersed on ceria nanostructures than at the corresponding Pd centres. Calculated vibrational fingerprints of surface COx moieties allow us to distinguish between CO adsorption on bare ceria NP (blue frequency shifts) and ceria-supported metal atoms (red frequency shifts). However, discrimination between the CO2 and CO32− species anchored to M-containing and bare ceria particles based solely on vibrational spectroscopy seems problematic. This computational modelling study provides guidance for the knowledge-driven design of more efficient ceria-based single-atom catalysts for the environmentally important CO oxidation reaction.

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

Cited by 99 publications

References 129 publications

Tuning Metal–Support Interaction of Pt-CeO₂ Catalysts for Enhanced Oxidation Reactivity

Tuning Metal–Support Interaction of Pt-CeO₂ Catalysts for Enhanced Oxidation Reactivity

Delafossite Ag₂CuMnO₄ is a Novel Catalytic Material for Low‐Temperature Oxidation of CO and NH₃

Adsorption and Oxidation of CO on Ceria Nanoparticles Exposing Single-Atom Pd and Ag: A DFT Modelling

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

Cited by 99 publications

References 129 publications

Tuning Metal–Support Interaction of Pt-CeO2 Catalysts for Enhanced Oxidation Reactivity

Tuning Metal–Support Interaction of Pt-CeO2 Catalysts for Enhanced Oxidation Reactivity

Delafossite Ag2CuMnO4 is a Novel Catalytic Material for Low‐Temperature Oxidation of CO and NH3

Adsorption and Oxidation of CO on Ceria Nanoparticles Exposing Single-Atom Pd and Ag: A DFT Modelling

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Tuning Metal–Support Interaction of Pt-CeO₂ Catalysts for Enhanced Oxidation Reactivity

Tuning Metal–Support Interaction of Pt-CeO₂ Catalysts for Enhanced Oxidation Reactivity

Delafossite Ag₂CuMnO₄ is a Novel Catalytic Material for Low‐Temperature Oxidation of CO and NH₃