Transesterification of rapeseed oil for the production of biodiesel using homogeneous and heterogeneous catalysis

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dc.contributor.authorGeorgogianni, K. G.en
dc.contributor.authorKatsoulidis, A. K.en
dc.contributor.authorPomonis, P. J.en
dc.contributor.authorManos, G.en
dc.contributor.authorKontominas, M. G.en
dc.date.accessioned2015-11-24T16:51:44Z
dc.date.available2015-11-24T16:51:44Z
dc.identifier.issn0378-3820-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/9776
dc.rightsDefault Licence-
dc.subjectbiodieselen
dc.subjectrapeseeden
dc.subjecttransesterificationen
dc.subjectultrasonicationen
dc.subjectheterogeneous/homogeneous catalysisen
dc.subjectmicroporous titanosilicate ets-10en
dc.subjectsolid base catalystsen
dc.subjectsoybean oilen
dc.subjectsupercritical methanolen
dc.subjectmethyl-estersen
dc.subjectvegetable-oilsen
dc.subjectbutyl acetateen
dc.subjectfatty-acidsen
dc.subjectkineticsen
dc.subjectalcoholysisen
dc.titleTransesterification of rapeseed oil for the production of biodiesel using homogeneous and heterogeneous catalysisen
heal.abstractIn the present work. the transesterification reaction of rapeseed oil with methanol, in the presence of alkaline catalysts, either homogeneous (NaOH) or heterogeneous (Mg MCM-41, Mg-Al Hydrotalcite, and K+ impregnated zirconia), using low frequency ultrasonication (24 kHz) and mechanical stirring (600 rpm) for the production of biodiesel fuel was studied. Selection of heterogeneous catalysts was based on a combination of their porosity and surface basicity. Their characterization was carried out using X-ray diffraction (XRD), Nitrogen adsorption-desorption porosimetry and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). The activities of the catalysts were related to their basic strength. Mg-Al hydrotalcite showed particularly the highest activity with conversion reaching 97%). The activity of ZrO(2) in the transesterification reaction increased as the catalyst was doped with more potassium cations, becoming thus more basic. Use of ultrasonication significantly accelerated the transesterification reaction compared to the use of mechanical stirring (5 h vs. 24 h). Given the differences in experimental design, it can be concluded that the homogeneous catalyst accelerated significantly the transesterification reaction, as compared to all heterogeneous catalysts. using both mechanical stirring (15 min vs. 24 h) and ultrasonication (10 min vs. 5 h). However, the use of homogeneous base catalysts requires neutralization and separation from the reaction mixture leading to a series of environmental problems related to the use of high amounts of solvents and energy. Heterogeneous solid base catalysts can be easily separated from the reaction mixture by simple filtration, they are easily regenerated and bear a less corrosive nature, leading to safer, cheaper and more environment-friendly operations. (c) 2009 Elsevier B.V. All rights reserved.en
heal.accesscampus-
heal.fullTextAvailabilityTRUE-
heal.identifier.primaryDOI 10.1016/j.fuproc.2009.03.002-
heal.identifier.secondary<Go to ISI>://000267692600026-
heal.identifier.secondaryhttp://ac.els-cdn.com/S0378382009000538/1-s2.0-S0378382009000538-main.pdf?_tid=c301a3f066c63e784c04c8384541ae90&acdnat=1333036234_ad32a818e5e1be0141bff496de7c8349-
heal.journalNameFuel Processing Technologyen
heal.journalTypepeer reviewed-
heal.languageen-
heal.publicationDate2009-
heal.publisherElsevieren
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείαςel
heal.typejournalArticle-
heal.type.elΆρθρο Περιοδικούel
heal.type.enJournal articleen

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