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Tungsten oxide supported on copper ferrite: a novel magnetic acid heterogeneous catalyst for biodiesel production from low quality feedstock.

Hiarla Cristina Lima Dos SantosMatheus Arrais GonçalvesAlexandre da Cas ViegasBruno Apolo Miranda FigueiraPatrícia Teresa Souza da LuzGeraldo Narciso da Rocha FilhoLeyvison Rafael Vieira da Conceição
Published in: RSC advances (2022)
This study aims to synthesize a WO 3 /CuFe 2 O 4 catalyst through a wet impregnation method and use it as a new magnetic acid catalyst in the transesterification process of waste cooking oil (WCO). The results of the characterization by XRD, FTIR, SEM, EDS, TG/DTG, VSM and Surface Acidity showed that the obtained bifunctional catalyst has been successfully synthesized. The study of the reaction parameters, such as reaction temperature (140-180 °C), reaction time (1-5 h), molar ratio MeOH : oil (25 : 1-45 : 1) and catalyst loading (2-10% m m -1 ) was performed in the conversion of WCO into biodiesel via transesterification. The reactional behavior showed the following optimal reaction conditions: reaction temperature of 180 °C, reaction time of 3 h, molar ratio MeOH : oil of 45 : 1 and catalyst loading of 6%. Based on the results, biodiesel with a maximum ester content of 95.2% was obtained using the WO 3 /CuFe 2 O 4 magnetic catalyst under the optimal reaction conditions. The magnetic catalyst showed excellent catalytic and magnetic performance and it was applied in five reaction cycles with ester content above 80%. Biodiesel properties were found in accordance with ASTM limits. This research provided the development of a stable and reusable WO 3 /CuFe 2 O 4 bifunctional catalyst for potential application in biodiesel production.
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