TAP Investigation of NO Adsorption on Pd/Al2O3: Effect of Thermal Aging

Topics in Catalysis - Tập 56 - Trang 279-286 - 2013
F. Dhainaut1, Y. Renème1, S. Pietrzik1, Y. Schuurman2, C. Mirodatos2, P. Granger1
1Unité de Catalyse et de Chimie du Solide, UMR CNRS 8181, Université de Lille, Cité Scientifique, Villeneuve d’Ascq, France
2Ircelyon, UMR CNRS 5256, Villeurbanne, France

Tóm tắt

This paper deals with the aging effect on the kinetics of the NO decomposition on a commercial Pd/Al2O3 catalyst. Temporal analysis of products experiments are discussed in the light of a selected mechanism involving the recombination of two NOads species to form N2O, which is an intermediate in N2 formation. Experiments over the fresh catalyst indicate a strong metal/support interface, with a spill-over effect, which is difficult to model. Thermal aging had a detrimental effect over this interface, the kinetic features depending mainly on the metallic Pd sites. The different heats of adsorption and activation energies are proven consistent with other theoretical studies. The mechanism led to a high surface coverage for O ad-atoms.

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