Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/11045
DC FieldValueLanguage
dc.contributor.authorLambrou, Panayiota S.-
dc.contributor.authorCosta, Costas-
dc.contributor.authorChristou, Stavroula Y.-
dc.contributor.authorEfstathiou, A. M.-
dc.date.accessioned2018-05-14T10:20:51Z-
dc.date.available2018-05-14T10:20:51Z-
dc.date.issued2004-12-30-
dc.identifier.citationApplied Catalysis B: Environmental, 2004, Volume 54, Issue 4, Pages 237-250en_US
dc.identifier.issn09263373-
dc.identifier.urihttps://hdl.handle.net/20.500.14279/11045-
dc.description.abstractThe present work has provided new fundamental information on the effects of aging (mileage, km) of a commercial Pd-Rh (9:1, w/w) three-way catalyst (TWC) on (a) the H2 chemisorption, (b) the redox properties of washcoat material, and (c) the dynamic oxygen storage and release properties of TWC. Hydrogen chemisorption in the 25–400 °C range was found to decrease with increasing aging of TWC. On the other hand, H2 chemisorption performed at 200 and 400 °C resulted in a significantly larger amount of chemisorbed hydrogen (exceeding the monolayer value based on the noble metals) compared to that obtained after chemisorption at 25 °C. This is due to the onset of a hydrogen spill over process in the 200–400 °C range. The features of H2-TPD spectra were found to strongly depend on the aging of TWC. Hydrogen chemisorption at 25 °C followed by TPD after a given pre-treatment of the catalyst surface might be considered as a procedure for a good estimate of the metal dispersion of a commercial Pd-Rh TWC. The redox properties of the oxygen storage components of the washcoat of a commercial Pd-Rh TWC were found to drastically change with increasing aging of TWC. It was found that the oxygen storage capacity (OSC) of the TWC investigated decreases significantly with catalyst aging in the 0–56,000 km range and in the temperature range of 500–750 °C. In the case of fresh TWC, the presence of 20 ppm SO2 or 10% CO2 in a 1.5% O2/He gas mixture used for oxygen storage (oxidizing gas) was found to result in a large decrease in the amount of dynamic OSC measured by alternating switches between oxidizing and reducing feed gas compositions. The shift in time of the peak maximum of the transient response of CO2 obtained during the switch O2/He → He → CO/He (t) can be ascribed to the alteration of the kinetics of the oxygen back-spillover process and not to the kinetics of CO oxidation on the metal surface.en_US
dc.formatpdfen_US
dc.language.isoenen_US
dc.rights© 2004 Elsevier B.V.en_US
dc.subjectBack-spillover of oxygenen_US
dc.subjectHydrogen spilloveren_US
dc.subjectOxygen storage capacityen_US
dc.subjectPd-Rh three-way catalysten_US
dc.subjectRedox propertiesen_US
dc.subjectTransient CO oxidationen_US
dc.titleDynamics of oxygen storage and release on commercial aged Pd-Rh three-way catalysts and their characterization by transient experimentsen_US
dc.typeArticleen_US
dc.collaborationUniversity of Cyprusen_US
dc.subject.categoryChemical Sciencesen_US
dc.journalsSubscription Journalen_US
dc.countryCyprusen_US
dc.subject.fieldNatural Sciencesen_US
dc.publicationPeer Revieweden_US
dc.identifier.doi10.1016/j.apcatb.2004.06.018-
cut.common.academicyear2004-2005en_US
item.cerifentitytypePublications-
item.languageiso639-1en-
item.fulltextNo Fulltext-
item.openairecristypehttp://purl.org/coar/resource_type/c_6501-
item.openairetypearticle-
item.grantfulltextnone-
crisitem.author.deptDepartment of Chemical Engineering-
crisitem.author.facultyFaculty of Geotechnical Sciences and Environmental Management-
crisitem.author.orcid0000-0002-8459-0356-
crisitem.author.parentorgFaculty of Geotechnical Sciences and Environmental Management-
Appears in Collections:Άρθρα/Articles
CORE Recommender
Show simple item record

SCOPUSTM   
Citations

83
checked on Nov 9, 2023

WEB OF SCIENCETM
Citations 10

77
Last Week
0
Last month
0
checked on Oct 29, 2023

Page view(s) 50

272
Last Week
0
Last month
1
checked on Feb 27, 2024

Google ScholarTM

Check

Altmetric


Items in KTISIS are protected by copyright, with all rights reserved, unless otherwise indicated.