TY - JOUR
T1 - Acetylation of glycerol using MgO–CaO catalysts with different CaO loadings
AU - Manríquez-Ramírez, Ma Elena
AU - Elizalde, Ignacio
AU - Ramírez-López, Román
AU - Trejo-Valdez, Martín
AU - Estrada-Flores, Miriam
N1 - Publisher Copyright:
© 2020, Akadémiai Kiadó, Budapest, Hungary.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - The synthesis of three catalytic samples of MgO–CaO containing 20, 30, 50 wt% of CaO was carried out by a co-precipitation method. Also pure MgO and CaO were prepared. Infrared spectroscopy, Raman, X-ray photoelectron, X-ray diffraction, atomic force microscopy and Temperature-Programmed Desorption of CO2 characterized powder samples. Those analyses permitted to differentiate phases in mixed oxides in catalysts and to identify phases that gave a basic character to solid samples. The powders were used to catalyze the acetylation of glycerol to produce mono, di and triacetin at 70 °C during 280 min. The reaction products were followed by IR, and gas chromatograph analysis. The highest glycerol conversion (89%) was attained by using 50MgO–50CaO catalytic sample, while pure MgO exhibited the poorest conversion (of c.a. 64%). Regarding selectivity toward triacetin, the catalyst containing 50 wt% CaO was the best, reaching a value of ~ 92%, while yielding the lowest diacetin and monoacetin (0.5 and 5%, respectively). Despite the catalyst types, triacetin selectivity profiles showed increased as reaction time did, whereas diacetin underwent a continuous decrease and monoacetin remained almost constant with the reaction time. The study results demonstrated that MgO–CaO mixed oxides provided a synergetic effect in glycerol acetylation in terms of both conversion and selectivity to valuable products.
AB - The synthesis of three catalytic samples of MgO–CaO containing 20, 30, 50 wt% of CaO was carried out by a co-precipitation method. Also pure MgO and CaO were prepared. Infrared spectroscopy, Raman, X-ray photoelectron, X-ray diffraction, atomic force microscopy and Temperature-Programmed Desorption of CO2 characterized powder samples. Those analyses permitted to differentiate phases in mixed oxides in catalysts and to identify phases that gave a basic character to solid samples. The powders were used to catalyze the acetylation of glycerol to produce mono, di and triacetin at 70 °C during 280 min. The reaction products were followed by IR, and gas chromatograph analysis. The highest glycerol conversion (89%) was attained by using 50MgO–50CaO catalytic sample, while pure MgO exhibited the poorest conversion (of c.a. 64%). Regarding selectivity toward triacetin, the catalyst containing 50 wt% CaO was the best, reaching a value of ~ 92%, while yielding the lowest diacetin and monoacetin (0.5 and 5%, respectively). Despite the catalyst types, triacetin selectivity profiles showed increased as reaction time did, whereas diacetin underwent a continuous decrease and monoacetin remained almost constant with the reaction time. The study results demonstrated that MgO–CaO mixed oxides provided a synergetic effect in glycerol acetylation in terms of both conversion and selectivity to valuable products.
KW - Acetin selectivity
KW - CaO loading
KW - Glycerol valorization
KW - MgO–CaO mixed oxides
KW - Mixed oxide characterization
KW - Synergetic effect
UR - http://www.scopus.com/inward/record.url?scp=85083803829&partnerID=8YFLogxK
U2 - 10.1007/s11144-020-01774-z
DO - 10.1007/s11144-020-01774-z
M3 - Artículo
AN - SCOPUS:85083803829
SN - 1878-5190
VL - 130
SP - 417
EP - 431
JO - Reaction Kinetics, Mechanisms and Catalysis
JF - Reaction Kinetics, Mechanisms and Catalysis
IS - 1
ER -