X-ray photoelectron spectroscopy study of Pd oxidation by RF discharge in oxygen

Kibis, Lidiya S.; Titkov, A. I.; Stadnichenko, A. I.; Koscheev, S.V.; Boronin, A. I.

doi:10.1016/j.apsusc.2009.07.011

Cited by 160 publications

(134 citation statements)

References 44 publications

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“…The binding energy of the Pd3d 5/2 line equal to 335.3 eV in the initial dispersion obtained in water is close to the value for the metallic state of palladium 335.1-335.2 eV [68][69][70] (Fig. 4).…”

Section: Xps Studysupporting

confidence: 78%

Metal–support interaction in Pd/CeO₂ model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst

Slavinskaya

Kardash

Стонкус

et al. 2016

Catal. Sci. Technol.

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Palladium and cerium oxide nanoparticles obtained by pulsed laser ablation (PLA) in liquid (water or ethanol) have been used as nanostructured precursors for synthesis of the composite Pd/CeO2 catalysts. The initial mixture of Pd and CeO2 nanoparticles does not show catalytic activity at temperatures lower than 100°C. It has been found that the composites prepared by PLA in alcohol are easily activated by calcination in air at 450-600°C demonstrating high activity at room temperature. Application of XRD, TEM and XPS reveals that laser ablation in water leads to the formation of large and well crystallized nanoparticles of palladium and CeO2, whereas ablation in alcohol results in formation of much smaller PdCx nanoparticles. The activation of the composites takes place due to the strong Pd-ceria interaction which occurs easier for highly-dispersed defective particles obtained in alcohol. Such interaction implies the introduction of palladium ions into the ceria lattice with formation of a mixed phase of PdxCe1-xO2-x-δ solid solution at the contact spaces of palladium and cerium oxide nanoparticles. The TPR-CO and XPS data show clearly that on the surface of the PdxCe1-xO2-x-δ solid solution the oxidized PdOx(s)/Pd-O-Ce(s) clusters are formed. These clusters comprise the highly reactive oxygen which is responsible for the high catalytic activity in LTO CO.Please do not adjust margins Please do not adjust margins CO (molecules/cm 3 ), X is the CO conversion, V RM is the reaction mixture rate (cm 3 /sec), m is the weight of the sample (g), and

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Section: Xps Studysupporting

confidence: 78%

Metal–support interaction in Pd/CeO₂ model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst

Slavinskaya

Kardash

Стонкус

et al. 2016

Catal. Sci. Technol.

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“…Figure 8 depicts the XPS spectra of Pd-zeolites and the measured binding energies are gathered in the Table 4. The peaks attributed to Pd 2+ 3d 3/2 and Pd 2+ 3d 5/2 fit well with PdO, while the larger peaks of lower binding energies correspond to pure metallic Pd (Pd o 3d 3/2 and Pd o 3d 5/2 ) [44][45][46]. Table 4.…”

Section: Xps Studiesmentioning

confidence: 70%

Catalytic removal of trichloroethylene from water over palladium loaded microporous and hierarchical zeolites

Śrębowata

Tarach

Girman

et al. 2016

Applied Catalysis B: Environmental

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“…50 The second shoulder peak centred at a binding energy of 337.6 eV, can typically be assigned to the presence of highly oxidized Pd species such as PdO2 (reported in the range between 337.2 -338.2 eV). [51][52][53] As the cubic NCs age over 6 months the PdOx peak intensity increased, which can be seen from comparison of the Pd 3d spectra in figure 5(a)-(c). The nature of the surface facets present in the NCs is important for understanding the oxidation behaviour of faceted NCs.…”

Section: Oxidation and Interaction Of Pvp With Pd Nanocrystalsmentioning

confidence: 77%

Stability, Oxidation, and Shape Evolution of PVP-Capped Pd Nanocrystals

et al. 2014

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Access to the full text of the published version may require a subscription. Rights © 2014 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form AbstractA critical aspect in the practical application and enhanced catalytic performance of shape controlled nanocrystals is their stability and morphology retention under ambient conditions.Changes to the morphology of shape-controlled Pd nanocrystals capped by PVP are assessed by TEM and surface oxidation was evaluated by X-ray photoelectron spectroscopy (XPS), over 12 months. Surface oxidation of PVP-capped Pd nanocrystals resulted in loss of edge and corner sites and transition to spherical morphologies. The shape stability of the nanocrystals was found to follow the trend cubic < cuboctahedra < octahedral ~ concave cubes. For low index planes, {111} surfaces are more resistant to oxidation compared to {100} facets, correlating with the surface free energy of the nanocrystals. Cubic and cuboctahedral nanocrystals transitioned to spherical particles while octahedral nanocrystals retained their morphology. The presence of high energy {110} facets were observed in the cubic nanocrystals which undergo surface reconstruction. The presence of surface defects such as stacking faults were also found to influence the rate of the structural changes.Concave cubic nanocrystals, which possess high index facets and surface energies were consistently found to display excellent morphology retention. The concave cubic 2 nanocrystals displayed superior shape stability and reduced oxidation compared to cubic and cuboctahedral nanocrystals. XPS analysis further determined that PVP capping ligands on different Pd surface facets strongly influences the morphological consistency. The stability of the concave cubes can be attributed to stronger chemisorption of PVP capping ligands to the high index plane making them less susceptible to oxidation.

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X-ray photoelectron spectroscopy study of Pd oxidation by RF discharge in oxygen

Cited by 160 publications

References 44 publications

Metal–support interaction in Pd/CeO₂ model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst

Metal–support interaction in Pd/CeO₂ model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst

Catalytic removal of trichloroethylene from water over palladium loaded microporous and hierarchical zeolites

Stability, Oxidation, and Shape Evolution of PVP-Capped Pd Nanocrystals

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X-ray photoelectron spectroscopy study of Pd oxidation by RF discharge in oxygen

Cited by 160 publications

References 44 publications

Metal–support interaction in Pd/CeO2 model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst

Metal–support interaction in Pd/CeO2 model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst

Catalytic removal of trichloroethylene from water over palladium loaded microporous and hierarchical zeolites

Stability, Oxidation, and Shape Evolution of PVP-Capped Pd Nanocrystals

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Product

Resources

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Metal–support interaction in Pd/CeO₂ model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst

Metal–support interaction in Pd/CeO₂ model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst