dc.contributor.author | Petallidou, Klito C. | en |
dc.contributor.author | Polychronopoulou, Kyriaki | en |
dc.contributor.author | Fierro, José Luis García | en |
dc.contributor.author | Efstathiou, Angelos M. | en |
dc.creator | Petallidou, Klito C. | en |
dc.creator | Polychronopoulou, Kyriaki | en |
dc.creator | Fierro, José Luis García | en |
dc.creator | Efstathiou, Angelos M. | en |
dc.date.accessioned | 2019-11-21T06:22:14Z | |
dc.date.available | 2019-11-21T06:22:14Z | |
dc.date.issued | 2015 | |
dc.identifier.issn | 0926-860X | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/56010 | |
dc.description.abstract | Hybrid 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 phase | en |
dc.description.abstract | the 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.source | Applied Catalysis A: General | en |
dc.source.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84942368804&doi=10.1016%2fj.apcata.2015.03.001&partnerID=40&md5=5607e88598ed3a7ba18f2a4305933325 | |
dc.subject | Ce0.8La0.2O2-δ | el |
dc.subject | Carbon nanotubes | en |
dc.subject | SSITKA | en |
dc.subject | Supported Pt | en |
dc.subject | Urea co-precipitation synthesis | en |
dc.subject | WGS reaction | en |
dc.title | Low-temperature water-gas shift on Pt/Ce0.8La0.2O2-δ-CNT: The effect of Ce0.8La0.2O2-δ/CNT ratio | el |
dc.type | info:eu-repo/semantics/article | |
dc.identifier.doi | 10.1016/j.apcata.2015.03.001 | |
dc.description.volume | 504 | |
dc.description.startingpage | 585 | |
dc.description.endingpage | 598 | |
dc.author.faculty | 002 Σχολή Θετικών και Εφαρμοσμένων Επιστημών / Faculty of Pure and Applied Sciences | |
dc.author.department | Τμήμα Χημείας / Department of Chemistry | |
dc.type.uhtype | Article | en |
dc.description.notes | <p>Cited By :2</p> | en |
dc.source.abbreviation | Appl Catal A Gen | en |
dc.contributor.orcid | Efstathiou, Angelos M. [0000-0001-8393-8800] | |
dc.contributor.orcid | Polychronopoulou, Kyriaki [0000-0002-0723-9941] | |
dc.gnosis.orcid | 0000-0001-8393-8800 | |
dc.gnosis.orcid | 0000-0002-0723-9941 | |