Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil
Authors
Zdujić, Miodrag
Lukić, Ivana

Kesić, Željka

Janković-Častvan, Ivona

Marković, Smilja

Jovalekić, Čedomir

Skala, Dejan

Article (Accepted Version)
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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 activi...ty 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.
Keywords:
biodiesel / calcium silicates / catalytic activity / CaOSource:
Advanced Powder Technology, 2019, 30, 6, 1141-1150Publisher:
- Elsevier
Funding / projects:
Note:
- Supporting information: https://hdl.handle.net/21.15107/rcub_dais_5974
- Published version: https://hdl.handle.net/21.15107/rcub_dais_5802
Related info:
- Version of
http://dx.doi.org/10.1016/j.apt.2019.03.009 - Version of
https://hdl.handle.net/21.15107/rcub_dais_5802 - Referenced by
https://hdl.handle.net/21.15107/rcub_dais_5974
DOI: 10.1016/j.apt.2019.03.009
ISSN: 0921-8831
WoS: 000466775600003
Scopus: 2-s2.0-85062950461
URI
http://www.sciencedirect.com/science/article/pii/S0921883119300615https://dais.sanu.ac.rs/123456789/5142
Institution/Community
Институт техничких наука САНУ / Institute of Technical Sciences of SASATY - JOUR AU - Zdujić, Miodrag AU - Lukić, Ivana AU - Kesić, Željka AU - Janković-Častvan, Ivona AU - Marković, Smilja AU - Jovalekić, Čedomir AU - Skala, Dejan PY - 2019 UR - http://www.sciencedirect.com/science/article/pii/S0921883119300615 UR - https://dais.sanu.ac.rs/123456789/5142 AB - 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. PB - Elsevier T2 - Advanced Powder Technology T1 - Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil SP - 1141 EP - 1150 VL - 30 IS - 6 DO - 10.1016/j.apt.2019.03.009 UR - https://hdl.handle.net/21.15107/rcub_dais_5142 ER -
@article{ author = "Zdujić, Miodrag and Lukić, Ivana and Kesić, Željka and Janković-Častvan, Ivona and Marković, Smilja and Jovalekić, Čedomir and Skala, Dejan", year = "2019", 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.", publisher = "Elsevier", journal = "Advanced Powder Technology", title = "Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil", pages = "1141-1150", volume = "30", number = "6", doi = "10.1016/j.apt.2019.03.009", url = "https://hdl.handle.net/21.15107/rcub_dais_5142" }
Zdujić, M., Lukić, I., Kesić, Ž., Janković-Častvan, I., Marković, S., Jovalekić, Č.,& Skala, D.. (2019). Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil. in Advanced Powder Technology Elsevier., 30(6), 1141-1150. https://doi.org/10.1016/j.apt.2019.03.009 https://hdl.handle.net/21.15107/rcub_dais_5142
Zdujić M, Lukić I, Kesić Ž, Janković-Častvan I, Marković S, Jovalekić Č, Skala D. Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil. in Advanced Powder Technology. 2019;30(6):1141-1150. doi:10.1016/j.apt.2019.03.009 https://hdl.handle.net/21.15107/rcub_dais_5142 .
Zdujić, Miodrag, Lukić, Ivana, Kesić, Željka, Janković-Častvan, Ivona, Marković, Smilja, Jovalekić, Čedomir, Skala, Dejan, "Synthesis of CaOSiO2 compounds and their testing as heterogeneous catalysts for transesterification of sunflower oil" in Advanced Powder Technology, 30, no. 6 (2019):1141-1150, https://doi.org/10.1016/j.apt.2019.03.009 ., https://hdl.handle.net/21.15107/rcub_dais_5142 .