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dc.contributor.authorPetallidou, Klito C.en
dc.contributor.authorPolychronopoulou, Kyriakien
dc.contributor.authorFierro, José Luis Garcíaen
dc.contributor.authorEfstathiou, Angelos M.en
dc.creatorPetallidou, Klito C.en
dc.creatorPolychronopoulou, Kyriakien
dc.creatorFierro, José Luis Garcíaen
dc.creatorEfstathiou, Angelos M.en
dc.description.abstractHybrid materials of (100 - x) wt% Ce0.8La0.2O2-δ-x wt% CNT composition (x = 0, 7.5, 20.5, 32.5, 44.1 and 100) were synthesized using the urea-assisted co-precipitation method and used as supports of 0.5 wt% Pt toward the low-temperature WGS (LT-WGS) reaction. The main focus of this work was to provide fundamental understanding of the effect of Ce0.8La0.2O2-δ/CNT ratio on the LT-WGS catalytic activity of such materials. It was found that the material containing 44.1 wt% CNT presented the best catalytic activity (kinetic rate and CO conversion), result that is correlated with the following parameters: (i) Pt-CO bond strength (TPD-CO), (ii) extent of dispersion of the Ce0.8La0.2O2-δ phase in the hybrid support system and, thus of the Pt phaseen
dc.description.abstractthe larger dispersion of the Ce0.8La0.2O2-δ phase had a direct impact on its reducibility ability (labile oxygen species), (iii) concentration of surface Ce3+ species (XPS), indication for an increased concentration of oxygen vacant sites, (iv) Pt-H bond strength (H2-TPD studies), and (v) concentration of active carbon-containing intermediates, "C-pool" formed around each Pt nanoparticle (SSITKA studies). WGS kinetic studies at 300°C revealed that the reaction order with respect to CO was 0.17 and 0.13 for the catalysts containing 20.5 and 44.1 wt% CNT, respectively, while the reaction order with respect to H2O was 1.40 for the latter CNT loading. Oxidation of CNTs over the catalyst containing 44.1 wt% of CNTs occurred at temperatures larger than 400°C, result of practical importance for the LT-WGS reaction. The proposed WGS reaction mechanism over the present catalytic materials is that of "redox" in parallel with the "associative with -OH group regeneration" mechanism. © 2015 Elsevier B.V. All rights reserved.en
dc.sourceApplied Catalysis A: Generalen
dc.subjectCarbon nanotubesen
dc.subjectSupported Pten
dc.subjectUrea co-precipitation synthesisen
dc.subjectWGS reactionen
dc.titleLow-temperature water-gas shift on Pt/Ce0.8La0.2O2-δ-CNT: The effect of Ce0.8La0.2O2-δ/CNT ratioel
dc.description.endingpage598 Σχολή Θετικών και Εφαρμοσμένων Επιστημών / Faculty of Pure and Applied SciencesΤμήμα Χημείας / Department of Chemistry
dc.description.notes<p>Cited By :2</p>en
dc.source.abbreviationAppl Catal A Genen
dc.contributor.orcidEfstathiou, Angelos M. [0000-0001-8393-8800]
dc.contributor.orcidPolychronopoulou, Kyriaki [0000-0002-0723-9941]

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