Synthesis of potassium polyferrite KxFeyOz heterogeneous catalyst for sunflower oil ethanolic transesterification

Ouédraogo Igor W.K., Happi Tchuessa Emma Brice, Sawadogo Balkissa, Mouras Sylvie, Blin Joël. 2023. Synthesis of potassium polyferrite KxFeyOz heterogeneous catalyst for sunflower oil ethanolic transesterification. Biomass Conversion and Biorefinery, 12 p.

Résumé : The catalytic behavior of K/Fe catalyst in biodiesel synthesis by ethanolic transesterification of sunflower vegetable oil was investigated. The catalysts were prepared according to the conventional precipitation, impregnation, and calcination methods. The catalysts were characterized by X-ray diffraction (XRD), FT-IR spectroscopy, thermogravimetric analysis (TGA), and Hammett-Benzoic acid indicator titration. Catalytic tests for biodiesel production revealed an excellent activity of the K/Fe3-800 catalyst, which is consistent with the number of basic sites (1.50 mmol/g) in bulk. Potassium polyferrite phases K1.55Fe11O17/K2Fe10O16 as basic active sites on the catalyst surface were generated, increasing the catalytic ability for biodiesel synthesis. The optimum conditions for transesterification reaction were catalyst amount of 5%, ethanol-to-oil molar ratio of 9:1, reaction temperature of 70 °C, and reaction time of 45 min. The maximum conversion of oil to ethyl esters reached 98.2%. The catalyst can tolerate free fatty acid and moisture up to 0.5% and 1%, respectively. K/Fe3-800 catalyst was successfully reused at least three times without post-treatment, and the obtained yield was higher than 92.3%. The XRD and TGA characterizations showed that poisoning of the active sites and pore fouling are the main reasons for the K/Fe3-800 deactivation. This finding indicates that the potassium loading on iron oxide catalysts provides valuable advantages such as low reaction time, easy recovery, and reuse in the transesterification reaction of sunflower oil.

Mots-clés Agrovoc : spectroscopie aux rayons x, Activité catalytique, potassium, huile de tournesol, transestérification, huile végétale, acide gras, éthanol

Mots-clés libres : Catalyse, Bioénergie, Biocarburant, Changement climatique

Classification Agris : P06 - Sources d'énergie renouvelable
Q60 - Traitement des produits agricoles non alimentaires

Champ stratégique Cirad : CTS 7 (2019-) - Hors champs stratégiques

Agences de financement européennes : European Commission

Agences de financement hors UE : The World Academy of Sciences

Projets sur financement : (EU) Vers une production durable et innovante de biocarburants en adéquation avec les potentiels et les besoins de l’Afrique

Auteurs et affiliations

• Ouédraogo Igor W.K., 2IE (BFA) - auteur correspondant
• Happi Tchuessa Emma Brice, 2IE (BFA)
• Sawadogo Balkissa, 2IE (BFA)
• Mouras Sylvie, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0003-3191-8239
• Blin Joël, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0001-6715-2453

Source : Cirad-Agritrop (https://agritrop.cirad.fr/605110/)

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