dc.contributor.author | Christou, Stavroula Y. | en |
dc.contributor.author | Costa, Costas N. | en |
dc.contributor.author | Efstathiou, Angelos M. | en |
dc.contributor.editor | Kruse N. | en |
dc.contributor.editor | Frennet A. | en |
dc.contributor.editor | Bastin J.M. | en |
dc.contributor.editor | Visart de Bocarme T. | en |
dc.creator | Christou, Stavroula Y. | en |
dc.creator | Costa, Costas N. | en |
dc.creator | Efstathiou, Angelos M. | en |
dc.date.accessioned | 2019-11-21T06:17:43Z | |
dc.date.available | 2019-11-21T06:17:43Z | |
dc.date.issued | 2004 | |
dc.identifier.issn | 1022-5528 | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/55337 | |
dc.description.abstract | A mathematical model was developed to study the transient release of oxygen from a 1 wt % Pd/CeO2 catalyst in the 450°-550°C range based on alternate step concentration switches between CO and O2. The proposed mathematical model allows the calculation of the transient rates of CO oxidation and back-spillover of oxygen during the transient period. A comparison of the two rates showed that as the reaction temperature increases from 450° to 550°C, the relative ratio of the rate of CO oxidation to that of back-spillover of oxygen decreases by a factor of 2.6. It also allows the estimation of the transient rates of the CO oxidation reaction and or the back-spillover of oxygen process. It also allows the calculation of the intrinsic rate constant k1 (s-1) of the Eley-Rideal step for the reaction of gaseous CO with surface oxygen species of PdO to form CO2. An activation energy of 10.1 kJ/mol was estimated for this elementary reaction step. An apparent rate constant k2/app (S-1) was estimated for the process of back-spillover of oxygen. The presented two-step kinetic scheme and the mathematical model derived could be extended to cover the case of two oxygen storage pools in the support material, the case in commercial three-way catalysts (TWC), e.g., CeO2 and CexZr1x O2), and also on the metal surface (e.g., Pd-Rh TWC). In addition, further chemical reaction steps might be needed to describe the transient kinetics of oxygen release in a much wider reaction temperature range (e.g., 200°-800°C). | en |
dc.source | 6th Congress on Catalysis and Automotive Pollution Control | en |
dc.source.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-3042825302&partnerID=40&md5=15ceb3a5d3cf114954fdd7d77b2fed6d | |
dc.subject | Oxygen storage capacity | en |
dc.subject | Oxygen back-spillover | en |
dc.subject | Transient CO oxidation | en |
dc.title | A two-step reaction mechanism of oxygen release from Pd/CeO2: Mathematical modelling based on step gas concentration experiments | en |
dc.type | info:eu-repo/semantics/article | |
dc.description.volume | 30-31 | |
dc.description.startingpage | 325 | |
dc.description.endingpage | 332 | |
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 :21</p> | en |
dc.source.abbreviation | Top.Catal. | en |
dc.contributor.orcid | Efstathiou, Angelos M. [0000-0001-8393-8800] | |
dc.contributor.orcid | Costa, Costas N. [0000-0002-8459-0356] | |
dc.gnosis.orcid | 0000-0001-8393-8800 | |
dc.gnosis.orcid | 0000-0002-8459-0356 | |