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dc.creatorZdujić, Miodrag
dc.creatorLukić, Ivana
dc.creatorKesić, Željka
dc.creatorJanković-Častvan, Ivona
dc.creatorMarković, Smilja
dc.creatorJovalekić, Čedomir
dc.creatorSkala, Dejan
dc.date.accessioned2021-03-10T14:07:35Z
dc.date.available2021-03-10T14:07:35Z
dc.date.issued2019
dc.identifier.issn0921-8831
dc.identifier.urihttp://TechnoRep.tmf.bg.ac.rs/handle/123456789/4261
dc.description.abstractThe powder mixtures of calcium oxide (CaO) and silica gel (SiO2) in molar ratios of 1:1, 1.5:1, 2:1 and 3:1 were mechanochemically treated with the addition of water, and were subsequently calcined with a goal of synthesizing CaSiO3, Ca3Si2O7, Ca2SiO4 compounds and CaO/Ca2SiO4 two-phase mixture. The prepared materials were characterized by XRD, FTIR, SEM/EDS, particle size laser diffraction (PSLD), UV-vis diffuse reflectance spectroscopy (DRS), N-2 adsorption/desorption isotherms, Hammett indicator for basic strength and volumetric analysis for free CaO content. The catalytic activity of calcium silicates with different Ca/Si ratios was tested in the transesterification of triacylglycerols (sunflower oil) with methanol. Samples obtained with initial composition 2CaO center dot SiO2 and 3CaO center dot SiO2 calcined at 700 degrees C, and 3CaO center dot SiO2 calcined at 900 degrees C had high catalytic activity, resulting with triacylglycerols conversion and fatty acids methyl ester formation (FAME or biodiesel) above 96%. The activity of these samples can be attributed to the existence of free CaO defined by CaO/Ca2SiO4 complex mixture. The effect of different amount of catalyst used for transesterification (0.2-2 wt%) was analyzed using the most active catalyst i.e. 3CaO center dot SiO2 calcined at 700 degrees C as well as possibility of its reuse for biodiesel synthesis. It was also found that CaSiO3, Ca3Si2O7 and Ca2SiO4, phases did not possess catalytic activity.en
dc.publisherElsevier Science Bv, Amsterdam
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45001/RS//
dc.rightsrestrictedAccess
dc.sourceAdvanced Powder Technology
dc.subjectCalcium silicatesen
dc.subjectBiodiesel, CaOen
dc.subjectCatalytic activityen
dc.titleSynthesis of CaO-SiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oilen
dc.typearticle
dc.rights.licenseARR
dc.citation.epage1150
dc.citation.issue6
dc.citation.other30(6): 1141-1150
dc.citation.rankM21
dc.citation.spage1141
dc.citation.volume30
dc.identifier.doi10.1016/j.apt.2019.03.009
dc.identifier.scopus2-s2.0-85062950461
dc.identifier.wos000466775600003
dc.type.versionpublishedVersion


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Приказ основних података о документу