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Please use this identifier to cite or link to this item: https://olympias.lib.uoi.gr/jspui/handle/123456789/13972
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dc.contributor.authorTriantafyllidis, K. S.en
dc.contributor.authorKarakoulia, S. A.en
dc.contributor.authorGournis, D.en
dc.contributor.authorDelimitis, A.en
dc.contributor.authorNalbandian, L.en
dc.contributor.authorMaccallini, E.en
dc.contributor.authorRudolf, P.en
dc.date.accessioned2015-11-24T17:34:28Z-
dc.date.available2015-11-24T17:34:28Z-
dc.identifier.issn1387-1811-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/13972-
dc.rightsDefault Licence-
dc.subjectcarbon nanotubesen
dc.subjectfe/co oxidesen
dc.subjectzeolite yen
dc.subjectdealuminationen
dc.subjectsecondary mesoporesen
dc.subjectchemical-vapor-depositionen
dc.subjectfield-emission propertiesen
dc.subjectacidic characteristicsen
dc.subjectcatalytic productionen
dc.subjectdealumination methoden
dc.subjectlow-temperatureen
dc.subjectgrowthen
dc.subjectpurificationen
dc.subjectfeen
dc.subjectdiameteren
dc.titleFormation of carbon nanotubes on iron/cobalt oxides supported on zeolite-Y: Effect of zeolite textural properties and particle morphologyen
heal.typejournalArticle-
heal.type.enJournal articleen
heal.type.elΆρθρο Περιοδικούel
heal.identifier.primaryDOI 10.1016/j.micromeso.2007.10-007-
heal.identifier.secondary<Go to ISI>://000254056200016-
heal.languageen-
heal.accesscampus-
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικώνel
heal.publicationDate2008-
heal.abstractThe effect of the textural properties and morphology of zeolite Y, used as support of iron (Fe) or cobalt (Co) oxides, on the quantity and quality of the multi-wall carbon nanotubes (MWNTs) synthesized by catalytic chemical vapour deposition (CCVD) of acetylene was studied. The parent zeolite Y was modified by various dealumination procedures, namely hydrothermal treatment (steaming), treatment with ammonium hexafluorosilicate (AHFS) and combined steaming-AHFS. The ion-exchange and wet impregnation methods were used for supporting the metals on the zeolite Y samples, with the latter method providing the most effective catalysts for carbon nanotube (CNT) formation. Severe dealumination of zeolite-Y by steaming, which induced the formation of secondary meso/macropores and of relatively large particles/aggregates, resulted in significant decrease in the formation of CNTs compared to the catalysts based on the parent zeolite-Y. Post-treatment of the steamed samples with AHFS had no beneficial effect on the catalysts' activity. Moderate dealumination of the parent zeolite Y by AHFS also inhibited the formation of CNTs, but to a lesser extent compared to the catalysts based on steamed zeolite Y. The TGA studies revealed the presence of carbon phases with different thermal stability in the zeolite-CNT composites, ranging from amorphous carbon to well-graphitized MWNTs. TEM images and micro-Raman spectra taken right after growth confirmed the formation of high quality MWNTs with a low degree of disorder irrespective of the catalysts used, the degree of dealumination of the zeolite Y and the textural and morphological characteristics of the zeolitic support. (c) 2007 Elsevier Inc. All rights reserved.en
heal.publisherElsevieren
heal.journalNameMicroporous and Mesoporous Materialsen
heal.journalTypepeer reviewed-
heal.fullTextAvailabilityTRUE-
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