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Influence of the exchanged cation in Pd/BEA and Pd/FAU zeolites for catalytic oxidation of VOCs |
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| Authors: | HL Tidahy S Siffert J-F Lamonier R Cousin EA Zhilinskaya A Aboukaïs B-L Su X Canet G De Weireld M Frre J-M Giraudon G Leclercq |
| Affiliation: | aLaboratoire de Catalyse et Environnement, E.A. 2598, Université du Littoral Côte d’Opale, 145 Avenue Schumann, 59140 Dunkerque, France bLaboratoire de Chimie des Matériaux Inorganiques, Facultés Universitaires Nôtre Dame de la Paix, 61 rue de Bruxelles, 5000 Namur, Belgium cLaboratoire de Thermodynamique Physique-Mathématique, Faculté Polytechnique de Mons, 31 Boulevard Dolez, 7000 Mons, Belgium dLaboratoire de Catalyse de Lille, UMR CNRS 8010, Université des Sciences et Technologies de Lille, Bât C3, 59655 Villeneuve d’Ascq, France |
| Abstract: | 0.5 wt% palladium supported on exchanged BEA and FAU zeolites were prepared, characterized and tested in the total oxidation of volatile organic compounds (VOCs). The BEA and FAU zeolites were exchanged with different cations to study the influence of alkali metal cations (Na+, Cs+) and H+ in Pd-based catalysts on propene and toluene total oxidation. The exchange with different cations (Na+, Cs+) and H+ led to a decrease of the surface area and the micropore volume. All Pd/BEA and Pd/FAU zeolites were found to be powerful catalysts for the total oxidation of VOCs. They were active at low temperature and totally selective for CO2 and H2O. However, their activity depends significantly on the type of zeolite and on the nature of the charge-compensating cation. The activity order for propene and toluene oxidation on FAU catalysts, Pd/CsFAU > Pd/NaFAU > Pd/HFAU, is the reverse of the activity order on BEA catalysts: Pd/HBEA > Pd/NaBEA > Pd/CsBEA. The catalytic activities can be rationalized in terms of the influence of the electronegativity of the charge-compensating cation on the Pd particles, the Pd dispersion, the PdO reducibility and the adsorption energies for VOCs. |
| Keywords: | Total oxidation of VOC Palladium Exchanged zeolite Adsorption |
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