Please use this identifier to cite or link to this item: https://ktisis.cut.ac.cy/handle/10488/11033
DC FieldValueLanguage
dc.contributor.authorBelessi, Vassiliki-
dc.contributor.authorBakas, Thomas V.-
dc.contributor.authorCosta, Costas-
dc.contributor.authorEfstathiou, A. M.-
dc.contributor.authorPomonis, Phillippos J.-
dc.contributor.otherΜπέλεση, Βασσιλική-
dc.date.accessioned2018-05-09T14:44:08Z-
dc.date.available2018-05-09T14:44:08Z-
dc.date.issued2000-09-18-
dc.identifier.citationApplied Catalysis B: Environmental, 2000, vol. 28, no. 1, pp. 13-28en_US
dc.identifier.issn0926-3373-
dc.identifier.urihttp://ktisis.cut.ac.cy/handle/10488/11033-
dc.description.abstractMixed oxidic and perovskite-type materials based on the La, Sr, Ce and Fe elements were prepared using a mixture of nitrates salts and heating at 1000°C. Three groups of solids were synthesized: (i) La1−yCeyFeO3 (y=0.2, 0.3, 0.5), (ii) La1−xSrxFeO3 (x=0.2, 0.3, 0.5) and (iii) La1−x−ySrxCeyFeO3 (x/y=0.05/0.15, 0.15/0.05, 0.1/0.2, 0.2/0.1, 0.2/0.3 and 0.3/0.2). The structure of the solids was examined by XRD and the main crystal phases determined were LaFeO3, α-Fe2O3 and CeO2 in group (i), LaFeO3 and SrFeO3−x in group (ii), and LaFeO3, α-Fe2O3, SrFeO3−x and CeO2 in group (iii), while traces of La(OH)3 and SrFe12O19 were also detected. The precise determination of the percentage amount of the iron-containing crystal phases in each solid composition was determined by Mössbauer spectroscopy at 20 K. The ceramic materials had low surface areas and were tested for their catalytic activity for the NO+CO reaction in a flow reactor in the range of 280–560°C. Conversions as high as 90% were achieved at 550°C at a GHSV=54 000 h−1. The reaction rate of NO conversion is favored by the increased amount of CeO2 in groups (i) and (iii) of solids that contain cerium. In the case of solids without CeO2 (group ii), the NO conversion is favored by the existence of SrFeO3−x phase at low temperatures (280–440°C), while it decreases at high temperatures (440–560°C). The double substituted solids La1−x−ySrxCeyFeO3 with x+y>0.3 and y>x were found to be the best catalysts for the NO+CO reaction as compared to the single substituted mixed oxides. Temperature programmed desorption (TPD) studies of NO and CO2 support the view that a synergistic effect takes place between the two phases of CeO2 and SrFeO3−x, whose co-existence results in the maximum enhancement of activity, via alternative oxidation–reduction cycles in the two phases.en_US
dc.formatpdfen_US
dc.language.isoenen_US
dc.publisherElsevier Science Publishers B.V.en_US
dc.relation.ispartofApplied Catalysis B: Environmentalen_US
dc.rights© Elsevieren_US
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/us/*
dc.subjectCarbon monoxideen_US
dc.subjectCatalytic reduction of NOen_US
dc.subjectCO2 TPDen_US
dc.subjectMossbaueren_US
dc.subjectNitrogen monoxideen_US
dc.subjectNO TPDen_US
dc.subjectPerovskiteen_US
dc.titleSynergistic effects of crystal phases and mixed valences in La-Sr-Ce-Fe-O mixed oxidic/perovskitic solids on their catalytic activity for the NO+CO reactionen_US
dc.typeArticleen_US
dc.collaborationUniversity of Ioanninaen_US
dc.collaborationUniversity of Cyprusen_US
dc.subject.categoryChemical Sciencesen_US
dc.journalsHybrid Open Accessen_US
dc.countryGreeceen_US
dc.countryCyprusen_US
dc.subject.fieldNatural Sciencesen_US
dc.publicationPeer Revieweden_US
dc.identifier.doi10.1016/S0926-3373(00)00159-4en_US
dc.relation.issue1en_US
dc.relation.volume28en_US
cut.common.academicyear2000-2001en_US
dc.identifier.spage13en_US
dc.identifier.epage28en_US
item.cerifentitytypePublications-
item.fulltextNo Fulltext-
item.grantfulltextnone-
item.languageiso639-1en-
item.openairecristypehttp://purl.org/coar/resource_type/c_6501-
item.openairetypearticle-
crisitem.journal.journalissn0926-3373-
crisitem.journal.publisherElsevier-
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 5

55
checked on Aug 2, 2021

WEB OF SCIENCETM
Citations

47
Last Week
0
Last month
checked on Dec 12, 2020

Page view(s) 5

171
Last Week
8
Last month
9
checked on Aug 3, 2021

Google ScholarTM

Check

Altmetric


This item is licensed under a Creative Commons License Creative Commons