Transesterification of rapeseed oil for the production of biodiesel using homogeneous and heterogeneous catalysis
Φόρτωση...
Ημερομηνία
Συγγραφείς
Georgogianni, K. G.
Katsoulidis, A. K.
Pomonis, P. J.
Manos, G.
Kontominas, M. G.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Elsevier
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Fuel Processing Technology
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
In 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.
Περιγραφή
Λέξεις-κλειδιά
biodiesel, rapeseed, transesterification, ultrasonication, heterogeneous/homogeneous catalysis, microporous titanosilicate ets-10, solid base catalysts, soybean oil, supercritical methanol, methyl-esters, vegetable-oils, butyl acetate, fatty-acids, kinetics, alcoholysis
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000267692600026
http://ac.els-cdn.com/S0378382009000538/1-s2.0-S0378382009000538-main.pdf?_tid=c301a3f066c63e784c04c8384541ae90&acdnat=1333036234_ad32a818e5e1be0141bff496de7c8349
http://ac.els-cdn.com/S0378382009000538/1-s2.0-S0378382009000538-main.pdf?_tid=c301a3f066c63e784c04c8384541ae90&acdnat=1333036234_ad32a818e5e1be0141bff496de7c8349
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας