Show simple item record

AuthorMonai, Matteo
AuthorMontini, Tiziano
AuthorMelchionna, Michele
AuthorDuchon, Tomas
AuthorKus, Peter
AuthorChen, Chen
AuthorTsud, Nataliya
AuthorNasi, Lucia
AuthorPrince, Kevin C.
AuthorVeltruska, Katerina
AuthorMatolin, Vladimir
AuthorKhader, Mahmoud M.
AuthorGorte, Raymond J.
AuthorFornasiero, Paolo
Available date2021-02-08T09:14:52Z
Publication Date2017
Publication NameApplied Catalysis B: Environmental
ResourceScopus
URIhttp://dx.doi.org/10.1016/j.apcatb.2016.09.016
URIhttp://hdl.handle.net/10576/17582
AbstractSO2 poisoning of methane oxidation over alumina-supported, Pd@CexZr1−xO2 nanoparticle catalysts was systematically studied by means of advanced PhotoElectron Spectroscopy (PES) methods. The Pd@CexZr1−xO2 units were synthesized and deposited on two modified-alumina supports, i.e. high surface area modified alumina and a model alumina prepared by Atomic Layer Deposition (ALD) of alumina on Indium Tin Oxide (ITO)/quartz slides. The model support was designed to be suitable for PES analysis and was stable to high temperature treatments (850 °C). Characterization of the high-surface-area (HSA) catalysts by X-Ray Diffraction (XRD), N2 physisorption, CO chemisorption and Transmission Electron Microscopy (TEM) indicated formation of CeO2–ZrO2 (CZ) mixed-oxide crystallites that stabilize the Pd active phase against sintering. Correlation of methane-oxidation rates with PES results demonstrated two distinct mechanisms for deactivation by SO2. Below 450 °C, the presence of SO2 in the feed led to partial reduction of the active PdO phase and to the formation of sulfates on the Pd. Above 500 °C, poisoning by SO2 was less severe due to spillover of the sulfates onto the oxide promoter. Pd@ZrO2 catalysts showed the best resistance to SO2 poisoning, outperforming analogous Pd@CZ mixed-oxide catalysts, because there was less sulfate formation and the sulfates that did form could be removed during regeneration.
SponsorThe authors acknowledge CERIC-ERIC for open access to instrumentation and user support. This paper was also made possible by a NPRP Grant #6-290-1-059 from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the authors.
Languageen
PublisherElsevier B.V.
SubjectCeria-Zirconia
Methane oxidation catalysts
Palladium
Sulfur dioxide
XPS
TitleThe effect of sulfur dioxide on the activity of hierarchical Pd-based catalysts in methane combustion
TypeArticle
Pagination72-83
Volume Number202
dc.accessType Abstract Only


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record