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NO + H2 reaction on Pd/Al2O3 under lean conditions: kinetic study

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This paper deals with the kinetics of the NO + H2 + O2 reactions on Pd/γ-Al2O3. Steady state rate measurements have been discussed in the light of previous mechanism proposals involving a dissociation step of molecular NO adsorbed species on Pd. In the absence of oxygen, the dissociation of NOads species is assisted by chemisorbed H atoms. However, different kinetic features have been observed in the presence of oxygen. Practically, the light-off curve of NO shifts towards higher temperature in the presence of O2. In addition the H2 + O2 reaction extensively occurs in the temperature range of this study. Such tendencies have been explained by changes in the adsorptive properties of noble metals and also in the nature of elementary steps for the dissociation of NO. In the presence of a large extent of O2, hydrogen coverage would sharply drop and would not further assist the dissociation of NO as in the absence of O2.

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Authors and Affiliations

  1. Unité de Catalyse et de Chimie du Solide – UMR CNRS 8181, Université des Sciences et Technologies de Lille, Ecole Centrale de Lille, Ecole Nationale Supérieure de Chimie de Lille, Bât. C3, 59655, Villeneuve d’Ascq, France

    F. Dhainaut, S. Pietrzyk & P. Granger

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  1. F. Dhainaut
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  2. S. Pietrzyk
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  3. P. Granger
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Correspondence to P. Granger.

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Dhainaut, F., Pietrzyk, S. & Granger, P. NO + H2 reaction on Pd/Al2O3 under lean conditions: kinetic study. Top Catal 42, 135–141 (2007). https://doi.org/10.1007/s11244-007-0166-2

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