Production of value-added chemicals from esterification of waste glycerol over MCM-41 supported catalysts

Abstract

A series of active and selective MCM-41 supported catalysts have been successfully prepared and used for bioderived glycerol esterification with acetic acid to produce fuel additives. In the synthesis of MCM-41, an acidic hydrothermal synthesis route was used, and silicotungstic acid (STA) and zirconia (ZrO2) were added to the catalyst structure by wet impregnation. X-ray diffraction, nitrogen adsorption-desorption methods, scanning electron microscopy with energy-dispersive spectroscopy, and inductively coupled plasma-mass spectrometry analysis were used for characterizations of the catalysts. Diffuse reflectance infrared Fourier transform spectroscopy analyses of pyridine-adsorbed catalysts owns Lewis and Brønsted acidity hosting in one, which promotes the esterification reaction of glycerol into glycerol esters with high selectivity. Esterification of glycerol reactions were performed at temperature intervals of 105°C–200°C, with an amount of catalyst equal to 0.5 g, and glycerol/acetic acid molar ratio of 1:6 in a stirred autoclave reactor operated batchwise. STA and ZrO2-impregnated MCM-41 catalysts showed better performance with a complete glycerol conversion and high selectivity to triacetin.

Green and Facile Synthesis of Metal-Organic Framework Cu-BTC-Supported Sn (II)-Substituted Keggin Heteropoly Composites as an Esterification Nanocatalyst for Biodiesel Production

“…One option is to use hetropolyacids as strong Brønsted acid catalysts for catalytic esterification and transesterification reactions to produce biodiesel with high conversions (Talebian-Kiakalaieh et al, 2013;Sun et al, 2015;Xie and Wan, 2019a). Unfortunately, hetropolyacids have certain disadvantages, such as good solubility in polar media and a low surface area (Parida and Mallick, 2007;Ekinci and Oktar, 2019). Therefore, supporting hetropolyacids on porous supports is an interesting approach to produce heterogeneous catalysts, since it can provide high surface area and insolubility in the polar solvent.…”

Glycerol Acetylation with Propionic Acid Using Iron and Cobalt Oxides in Al-MCM-41 Catalysts

“…Several studies have been published related to glycerol acetylation with acetic acid using heterogeneous catalysts that enrich both Brønsted and Lewis acidic sites. Acid zeolites, acid clays, modified molecular sieves, heteropoly acids, metal oxides, ion exchange resins, among others, with modifications in their chemical structures, are being responsible for increasing the number of acidic sites that were employed in the production of acetyl glycerides [17][18][19][20][21][22][23][24][25][26]. Heterogeneous acidic catalysts showed gains in glycerol functionalization towards derived products.…”

Valoración De Acetinas Como Reemplazo Parcial De Aceite Nafténico en Compuestos De Caucho Sbr1502

“…El incremento en la producción de biodiesel a escala mundial ha traído como consecuencia un aumento considerable de las existencias de glicerina, la cual se genera como subproducto de la síntesis de este biocombustible [1] [2]. Sin embargo, este tipo de glicerina no puede reemplazar la del grado farmacéutico USP (99.5%) debido a los altos costos que implica la purificación [3] [4].…”

“…La GT se valoriza por medio de la modificación química para producir biopolímeros, resinas alquílicas, fertilizantes y precursores químicos de alta importancia como 1,3propanodiol, ácido succínico [1] [9], glicerol carbonatado [10] y acetil gliceroles [11] [12].…”