Show simple item record

dc.contributor.authorChristou, Stavroula Y.en
dc.contributor.authorCosta, Costas N.en
dc.contributor.authorEfstathiou, Angelos M.en
dc.contributor.editorKruse N.en
dc.contributor.editorFrennet A.en
dc.contributor.editorBastin J.M.en
dc.contributor.editorVisart de Bocarme T.en
dc.creatorChristou, Stavroula Y.en
dc.creatorCosta, Costas N.en
dc.creatorEfstathiou, Angelos M.en
dc.description.abstractA 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.source6th Congress on Catalysis and Automotive Pollution Controlen
dc.subjectOxygen storage capacityen
dc.subjectOxygen back-spilloveren
dc.subjectTransient CO oxidationen
dc.titleA two-step reaction mechanism of oxygen release from Pd/CeO2: Mathematical modelling based on step gas concentration experimentsen
dc.description.endingpage332 Σχολή Θετικών και Εφαρμοσμένων Επιστημών / Faculty of Pure and Applied SciencesΤμήμα Χημείας / Department of Chemistry
dc.description.notes<p>Cited By :21</p>en
dc.contributor.orcidEfstathiou, Angelos M. [0000-0001-8393-8800]
dc.contributor.orcidCosta, Costas N. [0000-0002-8459-0356]

Files in this item


There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record