Arhzaf, S. and Bennani, M.N. and Abouarnadasse, S. and Amhoud, A. (2016) Basicity and catalytic activity studies of hydrotalcite MgAL-CO3 and its mixed oxide by adsorption of phenol and aldolic condensation of furfural on acetone Etude de la basicité de l'hydrotalcite MgAL-CO3 et de son oxyde mixte par adsorption du phénol et par mesure de l'activité catalytique dans la condensation du furfural avec l'acétone. Journal of Materials and Environmental Science, 7 (11). pp. 4226-4236.

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Mg-Al hydrotalcite-like compounds (with molar ratios ranging from 2 to 3) containing carbonate anions in the interlayer space were synthesized by co-precipitation method. The obtained materials were characterized using various experimental techniques such as X-ray Powder Diffraction (XRD), Infrared spectroscopy (FTIR), thermo-gravimetric analysis (TGA), N2 adsorption (BET) and Elemental analysis. The basicity of Mg-Al hydrotalcites and Mg-Al mixed oxides, was evaluated using the adsorption of phenol as a probe molecule and aldol condensation at 90°C without solvent between Furfural and acetone as reaction model. This reaction provides the 4- (2-furyl) -3-butene-2-one (FAc), a high value added product used as a flavor in the food industry. The kinetic study of the reaction was followed performing sampling at regular intervals; the samples were analyzed by gas chromatography. The adsorbed amounts of phenol have been determined by UV-Visible spectrophotometry. The highest conversion (about 99) and the maximum quantities of phenol adsorbed (Qads = 44,23 mg/g cat) were obtained with the mixed oxide from hydrotalcite MgAl-CO3 having Mg/Al molar ratio equal to 3. A correlation between the catalytic activity and the measure of the basicity by phenol probe was highlighted.

Item Type: Article
Subjects: Environmental Science
Divisions: SCIENTIFIC PRODUCTION > Environmental Science
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:47

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