dc.contributor.author | AlKetbi, Maitha | en |
dc.contributor.author | Polychronopoulou, Kyriaki | en |
dc.contributor.author | Abi Jaoude, Maguy | en |
dc.contributor.author | Vasiliades, Michalis A. | en |
dc.contributor.author | Sebastian, Victor | en |
dc.contributor.author | Hinder, Steven J. | en |
dc.contributor.author | Baker, Mark A. | en |
dc.contributor.author | Zedan, Abdallah F. | en |
dc.contributor.author | Efstathiou, Angelos M. | en |
dc.creator | AlKetbi, Maitha | en |
dc.creator | Polychronopoulou, Kyriaki | en |
dc.creator | Abi Jaoude, Maguy | en |
dc.creator | Vasiliades, Michalis A. | en |
dc.creator | Sebastian, Victor | en |
dc.creator | Hinder, Steven J. | en |
dc.creator | Baker, Mark A. | en |
dc.creator | Zedan, Abdallah F. | en |
dc.creator | Efstathiou, Angelos M. | en |
dc.date.accessioned | 2021-01-25T09:44:48Z | |
dc.date.available | 2021-01-25T09:44:48Z | |
dc.date.issued | 2020 | |
dc.identifier.issn | 0169-4332 | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/63038 | |
dc.description.abstract | Nanograins of Ce-La-xCu-O mixed metal oxides (wherex = 3, 5, 7, 10, 20 at.%), of approximately 16 nm2 area size, and having all the metal cations homogeneously distributed, are tested as ternary catalytic materials towards the CO oxidation in the 100–475 °C range. Preservation of the cubic ceria lattice structure in those catalysts following La3+ (heavy) and Cu2+ (light) metal cations doping is confirmed based on the powder X-ray diffraction and Raman shift studies. From X-ray photoelectron spectroscopy studies, the presence of mixed Ce3+/Ce4+ and Cu2+/Cu1+ oxidation states was confirmed, which was more profound in the low Cu-content Ce-La-xCu-O catalysts. The copper doping is also found to increase the concentration of oxygen vacant sites in the doped-CeO2 solid as demonstrated from the increase of the Raman intensity ratio IOv/IF2g of 1.58 and 1.78 with the increase in copper content from 7 to 20 at.% as compared to the lower value of 0.44 obtained for the Cu-free catalyst (Ce-La). The mobility of the surface and bulk oxygen ions in the lattice of such doped-CeO2 materials is further investigated using 16O/18O transient isothermal isotopic exchange (TIIE) experiments, and is found to be Cu at.% dependent. For the case of Ce-La-20Cu, the participation of the lattice oxygen (OL) in the reaction mechanism has been demonstrated using transient experiments. Accordingly, the specific rate (μmol CO m−2s−1) of the CO oxidation reaction is found to be higher for the Ce-La-20Cu and Ce-La-7Cu catalysts, corroborating thus the presence of more mobile/labile oxygen species in those ternary catalysts as opposed to the other lower copper compositions. | en |
dc.language.iso | en | en |
dc.source | Applied Surface Science | en |
dc.source.uri | http://www.sciencedirect.com/science/article/pii/S0169433219332908 | |
dc.title | Cu-Ce-La-Ox as efficient CO oxidation catalysts: Effect of Cu content | en |
dc.type | info:eu-repo/semantics/article | |
dc.identifier.doi | 10.1016/j.apsusc.2019.144474 | |
dc.description.volume | 505 | |
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.source.abbreviation | Applied Surface Science | en |
dc.contributor.orcid | Polychronopoulou, Kyriaki [0000-0002-0723-9941] | |
dc.contributor.orcid | Efstathiou, Angelos M. [0000-0001-8393-8800] | |
dc.contributor.orcid | Vasiliades, Michalis A. [0000-0002-1568-1158] | |
dc.gnosis.orcid | 0000-0002-0723-9941 | |
dc.gnosis.orcid | 0000-0001-8393-8800 | |
dc.gnosis.orcid | 0000-0002-1568-1158 | |