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Calcium and tin oxides for heterogeneous transesterification of Babasssu oil (Attalea speciosa)
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology.
2016 (English)In: Journal of Environmental Chemical Engineering, ISSN 2160-6544, E-ISSN 2213-3437Article in journal (Refereed) PublishedText
Abstract [en]

Non-edible oils and waste cooking oils are alternatives to uphold a sustainable large scale production of biodiesel considering large volumes and by-products. Babassu oil (Attalea speciosa) offers a challenging case study scenario for the preparation of a heterogeneous catalytic material. This study shows the binary synthesis of calcium and stannic oxide (CaO/SnO2) catalysts for transesterification of oils with high content of free fatty acids (FFAs). The catalysts were prepared with several mass ratios of CaO:SnO2 in the proportions of 1:4, 4:1, 7:3 and 1:1. The catalysts were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), and N2-physisorption analyses. Biodiesel production was tested using a 23 full factorial design with variables such as temperature, methanol/oil molar ratio, and catalyst weight relative to oil. Such design statistically proved that there was no significant effect over the response variable. Furthermore a Box-Behnken design surface response analysis using the same three variables with three levels was performed with MATLAB showing a non-linear relation and statistical response of the optimal conditions for biodiesel production. The optimal experimental conditions were found to be 54.1°C, agitation speed at 250rpm with 6wt.% of CaO/SnO2 (7:3 mass ratio of the binary catalyst) and 10:1 (methanol:oil) molar ratio. The catalyst has shown a high potential for conversion of Babassu oil by fine-tuning as a single step by simultaneous esterification and transesterification to biodiesel.

Place, publisher, year, edition, pages
Elsevier, 2016.
Keyword [en]
Babassu oil, Biodiesel, Heterogeneous catalyst, Mixed oxides, Transesterification, Calcium, Catalysts, Electron microscopy, Fatty acids, High resolution transmission electron microscopy, Methanol, Scanning electron microscopy, Tin oxides, Transmission electron microscopy, X ray diffraction, Full factorial design, Heterogeneous transesterification, Large scale productions, Mixed oxide, Optimal experimental conditions, Powder X ray diffraction, Oils and fats
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-186798DOI: 10.1016/j.jece.2016.04.006ScopusID: 2-s2.0-84964329865OAI: oai:DiVA.org:kth-186798DiVA: diva2:943098
Note

QC 20160627

Available from: 2016-06-27 Created: 2016-05-13 Last updated: 2016-06-27Bibliographically approved

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Kiros, Yohannes
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