Au-Modified Pd catalyst exhibits improved activity and stability for NO direct decomposition - Sorbonne Université
Journal Articles Catalysis Science & Technology Year : 2021

Au-Modified Pd catalyst exhibits improved activity and stability for NO direct decomposition

Abstract

The direct decomposition of NO x at moderate temperatures is a challenge because of the poisoning of the surface of noble metals by oxygen, yet the modification of Pd with Au enables obtaining a highly stable catalyst under an O 2-free feed at 450°C. Care was taken to ensure that the reaction was not due to the reduction of NO x with carbonaceous residues by monitoring CO 2 evolution. Pd-Au alloyed domains with a wide range of compositions were evidenced by in situ and ex situ XRD, the Pd content of which decreased with the increasing oxidising nature of the feed due to phase segregation giving rise to PdO and an Au-rich alloy. Under air, the limiting alloy composition was Pd 0.2 Au 0.8. The catalyst was yet inactive in the presence of 5% O 2 .
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Dates and versions

hal-03240877 , version 1 (28-05-2021)

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Taha Elgayyar, Josefine Schnee, Alain Tuel, Laurence Burel, Francoise Bosselet, et al.. Au-Modified Pd catalyst exhibits improved activity and stability for NO direct decomposition. Catalysis Science & Technology, 2021, 11, pp.2908 - 2914. ⟨10.1039/d1cy00301a⟩. ⟨hal-03240877⟩
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