Transesterification of canola oil with Sr/CaO using the Box-Behnken method Transesterification of canola oil with Sr/CaO using the Box-Behnken method
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Abstract
This work aimed to optimize the transesterification of canola oil to generate biodiesel with Sr/CaO catalysts obtained from eggshells by studying the effect of the amount of strontium, calcination temperature, and the Box-Behnken method. Sr/CaO catalysts with 3, 6, and 9 wt% Sr calcined at 500, 650, and 800 °C were prepared by wet impregnation using Sr(NO3)2 dissolved in methanol. As the amount of Sr and the calcination temperature of all series increases, so does the biodiesel yield. This is because more superficial active sites are generated with high Sr concentration and calcination temperature. Likewise, it was observed that SrCO3 species are formed, which would limit the catalyst performance. Based on the results, the catalyst with 9 wt% Sr calcined at 800 °C was the most active and used in the optimization. To achieve this, Box-Behnken method was used with the methanol/oil molar ratio, temperature, and time were used as factors using 8 wt% catalyst to oil. The optimum yield was 90.81 % at a methanol/oil molar ratio=10, 68.58 °C for 2 h.
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Mundo Nano. Revista Interdisciplinaria en Nanociencias y Nanotecnología por Universidad Nacional Autónoma de México se distribuye bajo una Licencia Creative Commons Atribución-NoComercial 4.0 Internacional.
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