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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.accessioned2019-03-21T11:08:51Z
dc.date.available2021-03-15
dc.date.issued2019
dc.identifier.issn0921-8831
dc.identifier.urihttp://www.sciencedirect.com/science/article/pii/S0921883119300615
dc.identifier.urihttp://dais.sanu.ac.rs/123456789/5142
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), N2 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·SiO2 and 3CaO·SiO2 calcined at 700 °C, and 3CaO·SiO2 calcined at 900 °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·SiO2 calcined at 700 °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.
dc.publisherElsevier
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45001/RS//
dc.rightsembargoedAccess
dc.sourceAdvanced Powder Technology
dc.subjectbiodiesel
dc.subjectcalcium silicates
dc.subjectcatalytic activity
dc.subjectCaO
dc.titleSynthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil
dc.typearticleen
dc.rights.licenseBY-NC-ND
dcterms.abstractСкала, Дејан; Јанковић-Частван, Ивона; Здујић, Миодраг; Кесић, Жељка; Лукић, Ивана; Марковић, Смиља; Јовалекић, Чедомир;
dc.citation.spage1141
dc.citation.epage1150
dc.citation.volume30
dc.citation.issue6
dc.identifier.wos000466775600003
dc.identifier.doi10.1016/j.apt.2019.03.009
dc.identifier.scopus2-s2.0-85062950461
dc.description.otherSupporting information: [http://dais.sanu.ac.rs/handle/123456789/5974]
dc.type.versionacceptedVersion


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