The effect of the ZrO<sub>2</sub> loading in SiO<sub>2</sub>@ZrO<sub>2</sub>-CaO catalysts for transesterification reaction

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dc.coverageDOI: 10.3390/ma13010221
dc.creatorSalinas, Daniela
dc.creatorGuerrero, Sichem
dc.creatorCampos, Cristian H.
dc.creatorBustamante, Tatiana M.
dc.creatorPecchi, Gina
dc.date2020
dc.date.accessioned2026-01-05T21:11:15Z
dc.date.available2026-01-05T21:11:15Z
dc.description<p>The effect of the ZrO<sub>2</sub> loading was studied on spherical SiO<sub>2</sub>@ZrO<sub>2</sub>-CaO structures synthetized by a simple route that combines the Stöber and sol-gel methods. The texture of these materials was determined using S<sub>BET</sub> by N<sub>2</sub> adsorption, where the increment in SiO<sub>2</sub> spheres' surface areas was reached with the incorporation of ZrO<sub>2</sub>. Combined the characterization techniques of using different alcoholic dissolutions of zirconium (VI) butoxide 0.04 M, 0.06 M, and 0.08 M, we obtained SiO<sub>2</sub>@ZrO<sub>2</sub> materials with 5.7, 20.2, and 25.2 wt % of Zr. Transmission electron microscopy (TEM) analysis also uncovered the shape and reproducibility of the SiO<sub>2</sub> spheres. The presence of Zr and Ca in the core-shell was also determined by TEM. X-ray diffraction (XRD) profiles showed that the c-ZrO<sub>2</sub> phase changed in to m-ZrO<sub>2</sub> by incorporating calcium, which was confirmed by Raman spectroscopy. The purity of the SiO<sub>2</sub> spheres, as well as the presence of Zr and Ca in the core-shell, was assessed by the Fourier transform infrared (FTIR) method. CO<sub>2</sub> temperature programmed desorption (TPD-CO<sub>2</sub>) measurements confirmed the increment in the amount of the basic sites and strength of these basic sites due to calcium incorporation. The catalyst reuse in FAME production from canola oil transesterification allowed confirmation that these calcium core@shell catalysts turn out to be actives and stables for this reaction.</p>eng
dc.descriptionThe effect of the ZrO2 loading was studied on spherical SiO2@ZrO2-CaO structures synthetized by a simple route that combines the Stöber and sol-gel methods. The texture of these materials was determined using SBET by N2 adsorption, where the increment in SiO2 spheres' surface areas was reached with the incorporation of ZrO2. Combined the characterization techniques of using different alcoholic dissolutions of zirconium (VI) butoxide 0.04 M, 0.06 M, and 0.08 M, we obtained SiO2@ZrO2 materials with 5.7, 20.2, and 25.2 wt % of Zr. Transmission electron microscopy (TEM) analysis also uncovered the shape and reproducibility of the SiO2 spheres. The presence of Zr and Ca in the core-shell was also determined by TEM. X-ray diffraction (XRD) profiles showed that the c-ZrO2 phase changed in to m-ZrO2 by incorporating calcium, which was confirmed by Raman spectroscopy. The purity of the SiO2 spheres, as well as the presence of Zr and Ca in the core-shell, was assessed by the Fourier transform infrared (FTIR) method. CO2 temperature programmed desorption (TPD-CO2) measurements confirmed the increment in the amount of the basic sites and strength of these basic sites due to calcium incorporation. The catalyst reuse in FAME production from canola oil transesterification allowed confirmation that these calcium core@shell catalysts turn out to be actives and stables for this reaction.spa
dc.identifierhttps://investigadores.uandes.cl/en/publications/41b0e9dc-78f2-424f-8db0-d1f69bb86900
dc.identifier.urihttps://repositorio.uandes.cl/handle/uandes/64733
dc.languageeng
dc.rightsinfo:eu-repo/semantics/openAccess
dc.sourcevol.13 (2020) date: 2020-01-01 nr.1 p.221
dc.subjectCaO
dc.subjectCatalyst
dc.subjectCore@shell
dc.subjectFAME
dc.subjectZrO
dc.subjectCaO
dc.subjectCatalyst
dc.subjectCore@shell
dc.subjectFAME
dc.subjectZrO2
dc.titleThe effect of the ZrO<sub>2</sub> loading in SiO<sub>2</sub>@ZrO<sub>2</sub>-CaO catalysts for transesterification reactioneng
dc.typeArticleeng
dc.typeArtículospa
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