dc.creator | Zdujić, Miodrag | |
dc.creator | Lukić, Ivana | |
dc.creator | Kesić, Željka | |
dc.creator | Janković-Častvan, Ivona | |
dc.creator | Marković, Smilja | |
dc.creator | Jovalekić, Čedomir | |
dc.creator | Skala, Dejan | |
dc.date.accessioned | 2019-03-21T11:08:51Z | |
dc.date.available | 2021-03-15 | |
dc.date.issued | 2019 | |
dc.identifier.issn | 0921-8831 | |
dc.identifier.uri | http://www.sciencedirect.com/science/article/pii/S0921883119300615 | |
dc.identifier.uri | https://dais.sanu.ac.rs/123456789/5142 | |
dc.description.abstract | The 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. | en |
dc.publisher | Elsevier | |
dc.relation | info:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45001/RS// | |
dc.relation.isversionof | http://dx.doi.org/10.1016/j.apt.2019.03.009 | |
dc.relation.isversionof | https://hdl.handle.net/21.15107/rcub_dais_5802 | |
dc.relation.isreferencedby | https://hdl.handle.net/21.15107/rcub_dais_5974 | |
dc.rights | embargoedAccess | |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.source | Advanced Powder Technology | |
dc.subject | biodiesel | |
dc.subject | calcium silicates | |
dc.subject | catalytic activity | |
dc.subject | CaO | |
dc.title | Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil | en |
dc.type | article | en |
dc.rights.license | BY-NC-ND | |
dcterms.abstract | Скала, Дејан; Јанковић-Частван, Ивона; Здујић, Миодраг; Кесић, Жељка; Лукић, Ивана; Марковић, Смиља; Јовалекић, Чедомир; | |
dc.citation.spage | 1141 | |
dc.citation.epage | 1150 | |
dc.citation.volume | 30 | |
dc.citation.issue | 6 | |
dc.identifier.wos | 000466775600003 | |
dc.identifier.doi | 10.1016/j.apt.2019.03.009 | |
dc.identifier.scopus | 2-s2.0-85062950461 | |
dc.description.other | Supporting information: [https://hdl.handle.net/21.15107/rcub_dais_5974] | |
dc.description.other | Published version: [https://hdl.handle.net/21.15107/rcub_dais_5802] | |
dc.type.version | acceptedVersion | |
dc.identifier.fulltext | https://dais.sanu.ac.rs/bitstream/id/16215/bitstream_16215.pdf | |
dc.identifier.rcub | https://hdl.handle.net/21.15107/rcub_dais_5142 | |