Title: Chromium-induced deactivation of a commercial honeycomb noble metal-based CO oxidation catalyst
Authors : Keav, Sylvain
Lu, Ye
Matam, Santhosh Kumar
Maegli, Alexandra E.
Heel, Andre
Weidenkaff, Anke
Ferri, Davide
Published in : Applied Catalysis A: General
Volume(Issue) : 469
Pages : 259
Pages to: 266
Publisher / Ed. Institution : Elsevier
Issue Date: 2014
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : CO oxidation; Noble metal; Honeycomb; Deactivation; Chromium
Subject (DDC) : 540: Chemistry
Abstract: A commercially available honeycomb CO oxidation catalyst used to control the exhaust of a solid oxide fuel cell (SOFC) based power system has been characterized after prolonged use. X-ray fluorescence (XRF), X-ray diffraction (XRD), Raman spectroscopy, N2 physisorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were employed to determine the phase composition, the morphology and the chemical state of the various components. Besides sintering of the active phase, deactivation was found to occur mainly as the result of the deposition of chromium-containing species on the catalyst washcoat. These fouling species mainly appeared as highly crystalline Cr2O3 particles and could still maintain acceptable CO oxidation activity under dry atmosphere. However, the formation of surface chromium oxyhydroxide species was found to occur in the presence of water vapor, leading to significant catalyst deactivation.
Departement: School of Engineering
Organisational Unit: Institute of Materials and Process Engineering (IMPE)
Publication type: Article in scientific Journal
DOI : 10.1016/j.apcata.2013.10.005
ISSN: 0926-860X
URI: https://digitalcollection.zhaw.ch/handle/11475/9066
Appears in Collections:Publikationen School of Engineering

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