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Pd-Ce interactions and adsorption properties of palladium: CO and NO TPD studies over Pd–Ce/Al2O3 catalysts

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Ciuparu, D., Bensalem, A., Pfefferle, L.

Editorial: Applied Catalysis B: Environmental, 26, p.241-255, 2000.

Rezumat:

We have examined the adsorption of CO and NO on powder Pd/Al2O3, Pd-Ce/Al2O3 and CeO2/Al2O3 catalysts, using temperature-programmed desorption (TPD). For CO adsorption on oxidized and pre-reduced Pd-Ce/Al2O3 TPD profiles are identical to those observed for Pd/Al2O3, suggesting that interactions between ceria and Pd have a negligible effect on the adsorption properties of CO. It does, however, affect the oxidation state of the palladium particles. For NO, there are differences between Pd/Al2O3 and Pd-Ce/Al2O3. On oxidized catalysts, Pd/Al2O3 is more efficient for NO dissociation. However, pre-reduction increases the amount of NO that can adsorb on Pd-Ce/Al2O3 and react to N2O and N-2. In comparison with Pd/Al2O3, reduced Pd-Ce/Al2O3 catalysts dissociate NO at relatively high temperatures but they are more reactive and favor N-2 over N2O.

Cuvinte cheie: palladium, ceria, CO, NO, TPD

URL: http://dx.doi.org/10.1016/S0926-3373(00)00130-2