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dc.contributor.authorChristou, Stavroula Y.en
dc.contributor.authorBirgersson, H.en
dc.contributor.authorEfstathiou, Angelos M.en
dc.creatorChristou, Stavroula Y.en
dc.creatorBirgersson, H.en
dc.creatorEfstathiou, Angelos M.en
dc.date.accessioned2019-11-21T06:17:22Z
dc.date.available2019-11-21T06:17:22Z
dc.date.issued2007
dc.identifier.urihttp://gnosis.library.ucy.ac.cy/handle/7/55334
dc.description.abstractEthylene diamine tetraacetic acid (EDTA) which is a well-known reagent for its metal extraction efficiency was studied for the first time towards the improvement of the catalytic activity and oxygen storage and release properties (OSC) of severely aged commercial three-way catalysts (TWC) on a laboratory scale. Optimization of the experimental parameters of EDTA-washing procedure of TWC was carried out by varying the washing time, volumetric flow rate, and temperature of EDTA solution. The EDTA-washing procedure of TWC was compared with that of oxalic acid-washing regarding their efficiency in removing P, Pb, S, Ca, Zn, Fe, Cu, Cr, Ni, and Mn, all known TWC contaminants that many of them cause severe deterioration of TWC's activity and oxygen storage and release properties. EDTA appears to be significantly efficient in removing Pb, Zn, Ca, Mn, Fe, Cu and Ni metal contaminants and sulfur but not of phosphorus (P). Phosphorus-containing species were found to be efficiently removed from the aged TWCs after oxalic acid washing. All regeneration procedures applied led to a significant partial recovery of catalytic activity of TWC (CO, CxHy and NOx conversions) under real exhaust gas conditions (dynamometer tests) due to the removal of large amounts of contaminants accumulated on the aged TWC. The washing procedures using oxalic acid alone or in combination with EDTA led to more significant improvements of both catalytic and OSC performance compared with those of EDTA washing alone. This was due to the ability of oxalic acid to remove P-containing compounds which appear to be one of the main causes of commercial three-way catalyst deactivation. © 2006 Elsevier B.V. All rights reserved.en
dc.sourceApplied Catalysis B: Environmentalen
dc.source.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-33846287275&doi=10.1016%2fj.apcatb.2006.09.008&partnerID=40&md5=29f13f7122f8287e53faeba3dfa805de
dc.subjectCarboxylic acidsen
dc.subjectCatalystsen
dc.subjectOxygen storage capacityen
dc.subjectCatalyst activityen
dc.subjectAcid-washingen
dc.subjectDynamometer testen
dc.subjectDynamometersen
dc.subjectEDTAen
dc.subjectOxalic aciden
dc.subjectTWC regenerationen
dc.subjectVolumetric analysisen
dc.subjectWashingen
dc.titleReactivation of severely aged commercial three-way catalysts by washing with weak EDTA and oxalic acid solutionsen
dc.typeinfo:eu-repo/semantics/article
dc.identifier.doi10.1016/j.apcatb.2006.09.008
dc.description.volume71
dc.description.issue3-4
dc.description.startingpage185
dc.description.endingpage198
dc.author.faculty002 Σχολή Θετικών και Εφαρμοσμένων Επιστημών / Faculty of Pure and Applied Sciences
dc.author.departmentΤμήμα Χημείας / Department of Chemistry
dc.type.uhtypeArticleen
dc.description.notes<p>Cited By :22</p>en
dc.source.abbreviationAppl.Catal.B Environ.en
dc.contributor.orcidEfstathiou, Angelos M. [0000-0001-8393-8800]
dc.gnosis.orcid0000-0001-8393-8800


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