Platinum state in highly active Pt/CeO2 catalysts from the X-ray photoelectron spectroscopy data

Stadnichenko, A. I.; Muravev, Valery; Svetlichnyi, V. A.; Boronin, Andrei I.

doi:10.1134/s0022476617060129

Cited by 28 publications

(17 citation statements)

References 28 publications

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“…Calcination at 600 °C increases the integrated intensity of the platinum signal in XPS spectra nearly by an order of magnitude, which suggests that platinum is dispersed on the ceria surface and can also be dissolved in the surface/subsurface CeO 2 layers. Platinum dissolution in CeO 2 is corroborated by the presence of the main state in the spectrum with the characteristic value of E b (Pt 4f 7/2 )=73.1 eV corresponding to the Pt 2+ x Ce 1− x O 2− δ solid solution, which is reduced at 200–400 °C (peak 3 in Figure ) during TPR–CO. PtO x NPs with 1< x <2 (peak 1) and PtO NPs (peak 2 in Figure ) remain on the solid‐solution surface.…”

Section: Discussionmentioning

confidence: 99%

“…A homemade software package, XPS‐Calc, was used for the mathematical treatment of the XPS spectra. This software was previously applied for different samples, including Pd/CeO 2 , Pt/CeO 2 catalysts, and PtO x NPs . The Shirley model and Gauss‐Lorentz functions were used for background subtraction and curve fitting, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…This software was previously applied for different samples, including Pd/CeO 2 ,P t/CeO 2 catalysts, and PtO x NPs. [65,71,90] The Shirley model and Gauss-Lorentz functions were used for background subtraction and curve fitting, respectively. XRD patterns were obtained on aB ruker D8 New (Germany) diffractometer using aC u Ka source.…”

Section: Methodsofi Nvestigationmentioning

confidence: 99%

“…x Ce 1Àx O 2Àd solid solution, [90] which is reduced at 200-400 8C (peak 3i nF igure 11)d uring TPR-CO. PtO x NPs with 1 < x < 2 (peak 1) and PtO NPs (peak 2i nF igure 11)r emain on the solidsolution surface. The interaction between platinum and CeO 2 Figure 12.…”

Section: Pt/ce-wmentioning

confidence: 99%

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Transformation of a Pt–CeO₂ Mechanical Mixture of Pulsed‐Laser‐Ablated Nanoparticles to a Highly Active Catalyst for Carbon Monoxide Oxidation

et al. 2018

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The pulsed laser ablation (PLA) in alcohol and water media was employed to prepare Pt and CeO2 PLA‐nanoparticles of different sizes and degrees of defectiveness. Interactions of metallic platinum and ceria particles were studied using the thermal activation of Pt–CeO2 mechanical mixtures in the CO+O2 reaction medium or O2 atmosphere. The thermal activation resulted in oxidized Pt2+/Pt4+ states of platinum in the surface solid solutions PtCeOx and/or PtOx clusters. Catalysts formed after calcination of the PLA‐ablated Pt–CeO2 mixtures in oxygen at 450–600 °C revealed CO conversion at very low temperatures up to 70 % depending on the conditions of PLA particles preparation and thermal activation of Pt–CeO2 mechanical mixture.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsofi Nvestigationmentioning

confidence: 99%

Section: Pt/ce-wmentioning

confidence: 99%

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Transformation of a Pt–CeO₂ Mechanical Mixture of Pulsed‐Laser‐Ablated Nanoparticles to a Highly Active Catalyst for Carbon Monoxide Oxidation

et al. 2018

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“…[13] The chemical composition was calculated from the XPS data, taking into account atomic sensitivity factors. [29] The original XPS-Calc software, which was successfully tested in our earlier works, [13,[30][31][32] was employed for the deconvolution of experimental spectra into individual components. The spectral background of the Pt4 f line was subtracted using the Shirley method, and an approximation of the doublets was calculated using Lorentzian and Gaussian functions.…”

Section: The X-ray Photoelectron Spectroscopymentioning

confidence: 99%

Cerium(III) Nitrate Derived CeO₂ Support Stabilising PtO_x Active Species for Room Temperature CO Oxidation

et al. 2020

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A new approach for preparing a PtOx/CeO2 catalyst for low‐temperature CO oxidation has been developed. The approach includes; i) preparation of a CeO2 support through the controllable thermal decomposition of Ce(NO3)3 ⋅ 6H2O, and then ii) deposition of polynuclear platinum nitrato complexes ([H3O⊂18‐crown‐6]2[Pt2(μ2‐OH)2(NO3)8][Pt4(μ3‐OH)2(μ2‐OH)4(NO3)10]) on the CeO2 support. The NO3−‐rich ceria support produced at the onset temperature of Ce(NO3)3 ‐> CeO2 transformation (220 °C) yields the “PtOx/CeO2‐220” catalyst that shows intriguingly high activity in CO oxidation, at room temperature and below. To understand the nature of the low‐temperature catalytic activity, prepared catalysts have been studied using X‐ray photoelectron spectroscopy (XPS), Raman and operando X‐ray absorption fine structure spectroscopy (XAFS) and transmission electron microscopy (TEM).

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Low‐Temperature CO Oxidation by the Pt/CeO₂ Based Catalysts

Stadnichenko,

Slavinskaya,

Stonkus

et al. 2024

ChemCatChem

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This review analyzes the literature data and the results of studies of the Pt/CeO2‐based catalysts that are capable of providing the low‐temperature CO oxidation (LTO CO). The review summarizes the catalytic characteristics and the main properties of Pt/CeO2‐based catalysts necessary for the low‐temperature oxidation at T < 50 oC. Analysis of the literature data on the use of physical methods of investigation and their correlation with the activity of Pt/CeO2 catalysts allowed us to conclude that the main active forms of platinum are small metallic clusters, single atoms Pt2+‐SA and oxide clusters PtOx interacting with ceria nanoparticles. It has been established that the most active forms are PtOx clusters, which provide a high reaction rate in the temperature range from ‐50 to +50 °C. Forms of ionic Pt2+ with different coordination with oxygen ensure the activity of catalysts starting at temperatures above 100 °C. Finally, small metallic clusters occupy an intermediate position, providing activity above 0 °C, but their instability and gradual transition to the oxidized state Pt2+/PtOx are noted. At the conclusion of the review, the results of mathematical modeling demonstrate the correct kinetics description of the low‐temperature CO oxidation based on the Mars‐van Krevelen and associative mechanisms.

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Platinum state in highly active Pt/CeO2 catalysts from the X-ray photoelectron spectroscopy data

Cited by 28 publications

References 28 publications

Transformation of a Pt–CeO₂ Mechanical Mixture of Pulsed‐Laser‐Ablated Nanoparticles to a Highly Active Catalyst for Carbon Monoxide Oxidation

Transformation of a Pt–CeO₂ Mechanical Mixture of Pulsed‐Laser‐Ablated Nanoparticles to a Highly Active Catalyst for Carbon Monoxide Oxidation

Cerium(III) Nitrate Derived CeO₂ Support Stabilising PtO_x Active Species for Room Temperature CO Oxidation

Low‐Temperature CO Oxidation by the Pt/CeO₂ Based Catalysts

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Platinum state in highly active Pt/CeO2 catalysts from the X-ray photoelectron spectroscopy data

Cited by 28 publications

References 28 publications

Transformation of a Pt–CeO2 Mechanical Mixture of Pulsed‐Laser‐Ablated Nanoparticles to a Highly Active Catalyst for Carbon Monoxide Oxidation

Transformation of a Pt–CeO2 Mechanical Mixture of Pulsed‐Laser‐Ablated Nanoparticles to a Highly Active Catalyst for Carbon Monoxide Oxidation

Cerium(III) Nitrate Derived CeO2 Support Stabilising PtOx Active Species for Room Temperature CO Oxidation

Low‐Temperature CO Oxidation by the Pt/CeO2 Based Catalysts

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Product

Resources

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Transformation of a Pt–CeO₂ Mechanical Mixture of Pulsed‐Laser‐Ablated Nanoparticles to a Highly Active Catalyst for Carbon Monoxide Oxidation

Transformation of a Pt–CeO₂ Mechanical Mixture of Pulsed‐Laser‐Ablated Nanoparticles to a Highly Active Catalyst for Carbon Monoxide Oxidation

Cerium(III) Nitrate Derived CeO₂ Support Stabilising PtO_x Active Species for Room Temperature CO Oxidation

Low‐Temperature CO Oxidation by the Pt/CeO₂ Based Catalysts