| Title |
Oxygen isotopic exchange on three-way catalysts: a dynamic kinetic model |
| Another Title |
Deguonies izotopų mainai automobilių katalizatoriuose: dinaminis modelis. |
| Authors |
Galdikas, Arvaidas ; Duprez, Daniel ; Bion, Nicolas ; Descorme, Claude ; Junevič, Teresa |
| Full Text |
|
| Is Part of |
Materials science = Medžiagotyra.. Kaunas : Technologija. 2007, vol. 13, no. 3, p. 193-205.. ISSN 1392-1320. eISSN 2029-7289 |
| Keywords [eng] |
Catalysis ; Three-way automotive catalysts ; Surface diffusion ; Kinetics ; Isotopic exchange ; Oxide ; Kinetic modeling |
| Abstract [eng] |
A time-resolved kinetic analysis has been developed for modeling experimental results of 18O/16O isotopic exchange over oxide-supported metal catalysts. Model is based on two very important points: 1) the parallel calculation of surface and bulk diffusion and 2) the implication of certain O species such as superoxides. This model is based on rate equations and includes several elementary processes: adsorption on the metal nanoclusters, reactions on the metal nanoclusters, desorption from the metal nanoclusters, surface and bulk diffusion on/in the oxide support and direct exchange with the gas phase. On the basis of this model a computer code was developed to determine the kinetic and thermodynamic parameters of the oxygen isotopic exchange reactions. The characteristics of a Rh/CeO2 and Pt/CexZr1-xO2 catalysts were examined in the temperature range between 200 °C and 450 °C. |
| Published |
Kaunas : Technologija |
| Type |
Journal article |
| Language |
English |
| Publication date |
2007 |
| CC license |
|
