Highly dispersed Pt+ on Ti Ce(1−)O2 as an active phase in preferential oxidation of CO

Rico-Francés, Soledad; Jardim, Erika de Oliveira; Wezendonk, Tim A.; Kapteijn, Freek; Gascón, Jorge; Sepúlveda-Escribano, A.; Ramos‐Fernández, Enrique V.

doi:10.1016/j.apcatb.2015.06.031

Cited by 36 publications

(28 citation statements)

References 52 publications

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“…Therefore, the combination of calcination and plasma treatments induced a strong Ptceria interaction which results in an the modification of the Pt electron density. This is possible because the Ce 4f level, which lies ~2 eV below the Fermi level, is partially occupied when ceria is reduced and the Pt° (6s 2 +5d 8 ) band has a high electron density at the Fermi level [25]. Consequently, it is possible the electron transfer between the partially reduced ceria and Pt in close contact.…”

Section: Resultsmentioning

confidence: 99%

Effect of cold Ar plasma treatment on the catalytic performance of Pt/CeO2 in water-gas shift reaction (WGS)

Pastor‐Pérez

Belda-Alcázar

Marini

et al. 2018

Applied Catalysis B: Environmental

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The effect of Ar plasma treatment on the catalytic performance of Pt/CeO 2 has been studied. The catalyst was activated using different procedures separately or in combination: calcination, reduction under pure H 2 and cold Ar plasma treatment. The resulting materials were characterized by X-ray photoelectron spectroscopy, X-ray adsorption near edge structure and temperature-programmed reduction with H 2. The resulting materials were tested in the water-gas shift reaction (WGS). It has been found that the combination of calcination, plasma and hydrogen treatments leads to a very active catalyst for WGS. Furthermore, the catalyst structure-performance relationship has been assessed. The plasma treatment generated electron-enriched Pt particles which show a very strong interaction with the ceria support. This favoured CO chemisorption and increased the reducibility of the support, which takes part in the WGS the reaction by favouring water splitting.

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Section: Resultsmentioning

confidence: 99%

Effect of cold Ar plasma treatment on the catalytic performance of Pt/CeO2 in water-gas shift reaction (WGS)

Pastor‐Pérez

Belda-Alcázar

Marini

et al. 2018

Applied Catalysis B: Environmental

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“…And Ni catalysts stabilized or anchored by Zr 4+ through a strong metal–support interaction exhibited superior stability for DRM . Apart from the anchoring effect through a strong metal–support interaction, Lewis acid sites can also alter the electron density of supported metals for improved CO dissociation in methanation, decomposition of hydrous hydrazine to hydrogen and preferential oxidation of CO . However, to the best of our knowledge these anchoring and electronic effects engendered by Lewis acid sites have not been studied in DRM reaction.…”

Section: Introductionmentioning

confidence: 91%

Lewis Acid Sites Stabilized Nickel Catalysts for Dry (CO₂) Reforming of Methane

Zhao

Chen

et al. 2016

ChemCatChem

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Strong Lewis acid species [Al–F] were synthesized on a series of Al2O3‐supported Ni catalysts modified with (0, 1, 5, and 10 wt.%) of KF to investigate the electronic and anchoring effect of [Al–F] on Ni catalysts in terms of catalytic activity, stability, and carbon resistance during dry reforming of methane (DRM) reaction. With the aids of XRD analysis, X‐ray photoelectron spectroscopy, H2 temperature‐programmed reduction, and in situ diffuse reflectance infrared Fourier transform spectroscopy analyses, it was found that the activity and stability of KF‐modified catalysts in the reaction was directly associated to the presence of [Al–F] sites. The [Al–F] Lewis acid sites not only stabilized the metal Ni from high‐temperature sintering after reaction of 200 h through an enhanced metal–support interaction, but also reduced the electron density of Ni metal, which alleviated the fast decomposition of CH4 and subsequent carbon deposition on catalysts. Balancing the rates for CH4 dissociation and carbon removal would be promising steps in the design of active and stable Ni‐based catalysts.

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“…In addition, the dispersion and stabilisation of active metals in reactions where coking and sintering are prone can also be controlled by the acid sites, especially Lewis acid sites (LAS) . The LAS serves as anchoring sites for stabilisation of active metals in reactions such as CO methanation, CO oxidation and hydrazine decomposition . Further, Ni et al reported that LAS‐stabilised Ni metal from high temperature sintering due to enhanced metal‐support interaction.…”

Section: Introductionmentioning

confidence: 99%

Fibrous spherical Ni‐M/ZSM‐5 (M: Mg, Ca, Ta, Ga) catalysts for methane dry reforming: The interplay between surface acidity‐basicity and coking resistance

et al. 2020

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A highly active and robust fibrous spherical ZSM-5-supported nickel catalyst with different promoters (Mg, Ca, Ta, Ga) have been synthesised by microemulsion method for dry reforming of methane (DRM). The structural framework provided by the unique fibrous spherical ZSM-5 aided confinement of Ni particles. Catalytic activity was improved by homogenous distribution of surface acid-basic sites, thereby reducing the propensity of coke deposition.Bimetallic Ni-Ta catalyst produced the highest CH 4 and CO 2 conversions at 93% and 98%, respectively, with H 2 /CO ratio closer to unity (0.97). The nature of acid sites and bimetallic Ni-Ta synergism amplified interaction of catalyst components, resulting in improved interaction with the reactants, thus impeding metal sintering and coke deposition. Consequently, the Ni-Ta/FZSM-5 catalyst shows long-term activity (80 hours) for the DRM reaction at 800 C. K E Y W O R D Sdry reforming, methane, Ni/ZSM-5, nickel, tantalum

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Highly dispersed Pt+ on Ti Ce(1−)O2 as an active phase in preferential oxidation of CO

Abstract: Graphical Abstract Highlights •Pt/CeO2-TiO2 is a better catalyst for PROX than Pt supported on pure oxides • The support is directly related with the catalyst performance

Cited by 36 publications

References 52 publications

Effect of cold Ar plasma treatment on the catalytic performance of Pt/CeO2 in water-gas shift reaction (WGS)

Effect of cold Ar plasma treatment on the catalytic performance of Pt/CeO2 in water-gas shift reaction (WGS)

Lewis Acid Sites Stabilized Nickel Catalysts for Dry (CO₂) Reforming of Methane

Fibrous spherical Ni‐M/ZSM‐5 (M: Mg, Ca, Ta, Ga) catalysts for methane dry reforming: The interplay between surface acidity‐basicity and coking resistance

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Highly dispersed Pt+ on Ti Ce(1−)O2 as an active phase in preferential oxidation of CO

Abstract: Graphical Abstract Highlights •Pt/CeO2-TiO2 is a better catalyst for PROX than Pt supported on pure oxides • The support is directly related with the catalyst performance

Cited by 36 publications

References 52 publications

Effect of cold Ar plasma treatment on the catalytic performance of Pt/CeO2 in water-gas shift reaction (WGS)

Effect of cold Ar plasma treatment on the catalytic performance of Pt/CeO2 in water-gas shift reaction (WGS)

Lewis Acid Sites Stabilized Nickel Catalysts for Dry (CO2) Reforming of Methane

Fibrous spherical Ni‐M/ZSM‐5 (M: Mg, Ca, Ta, Ga) catalysts for methane dry reforming: The interplay between surface acidity‐basicity and coking resistance

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Lewis Acid Sites Stabilized Nickel Catalysts for Dry (CO₂) Reforming of Methane