Impact of the Pd incorporation method on the kinetics of the CH<sub>4</sub>/O<sub>2</sub> reaction on Natural-Gas-Vehicle model Pd-doped LaMnO<sub>3</sub> catalysts - Université de Lille Accéder directement au contenu
Article Dans Une Revue Journal of Catalysis Année : 2024

Impact of the Pd incorporation method on the kinetics of the CH4/O2 reaction on Natural-Gas-Vehicle model Pd-doped LaMnO3 catalysts

Résumé

The kinetics of the CH4/O2 reaction was studied in lean conditions on Natural-Gas-Vehicle Pd-doped LaMnO3 catalysts. The impact of the method for Pd incorporation, sol–gel vs. impregnation, has been examined. The calcination temperature to obtain the perovskite structure turned out to be a key to determine the strength of the interaction between Pd and LaMnO3. Steady-state kinetic measurements at 400 °C have been modeled according to a single site or a dual site reaction mechanism representative of the cooperation between Pd and surface lattice oxygen species supplied by the support material. Impregnated catalysts are found sensitive to particle sintering inducing a deterioration of the metal-support interface. On the contrary, aging leads to strenghening of the metal-support interaction on sol–gel Pd catalysts which promotes methane conversion notably near three-way operating conditions.

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Chimie
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Dates et versions

hal-04601535 , version 1 (05-06-2024)

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Yuanshuang Zheng, Amaury Decoster, Fabien Dhainaut, Svetlana Heyte Dyshlovenko, Maya Marinova, et al.. Impact of the Pd incorporation method on the kinetics of the CH4/O2 reaction on Natural-Gas-Vehicle model Pd-doped LaMnO3 catalysts. Journal of Catalysis, 2024, Journal of Catalysis, 430, ⟨10.1016/j.jcat.2024.115353⟩. ⟨hal-04601535⟩
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