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Influence of the Ce-Zr promoter on Pd behaviour under dynamic CO/NO cycling conditions: A structural and chemical approach

AuthorsKubacka, Anna ; Iglesias Juez, Ana ; Michiel, Marco Di; Newton, Mark A.; Fernández García, Marcos
Issue Date2013
PublisherRoyal Society of Chemistry (UK)
CitationPhysical Chemistry Chemical Physics 15(22): 8640-8647 (2013)
AbstractThe behaviour of the Pd phase in three way catalysts (TWCs) having a Ce-Zr oxide as a promoter component has been examined under CO/NO cycling conditions. In order to extract information on the role of the noble metal and the metal-promoter interface, two catalysts in, respectively, the presence or the absence of the promoter and having a similar Pd particle size were analyzed by a synchronous multitechnique approach using X-ray absorption (XAS) or high energy X-ray diffraction (HXRD) in combination with diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) and mass spectrometry (MS). From a structural point of view it is shown that the promoter oxide strongly influences Pd behaviour, limiting morphological (size/shape) and structural (formation of carbide/oxide phases) modifications occurring under dynamic conditions in the absence of the promoter. Activity measurements show that these phenomena have important chemical consequences in terms of CO/NO pollutant metal coverage(s), the occurrence of NO and/or CO dissociation steps as well as the subsequent transformation of the pollutants into CO2 and N2.
Publisher version (URL)https://doi.org/10.1039/C3CP44293D
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