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Molecules 2017, 22(12), 2206; https://doi.org/10.3390/molecules22122206

Sulfonic Acid Functionalization of Different Zeolites and Their Use as Catalysts in the Microwave-Assisted Etherification of Glycerol with tert-Butyl Alcohol

Department of Organic Chemistry, Instituto Universitario de Investigación en Química Finay Nanoquímica (IUIQFN), University of Córdoba, Campus de Excelencia Internacional Agroalimentario (CeiA3), Marie Curie Building, E-14071 Córdoba, Spain
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Received: 31 October 2017 / Revised: 4 December 2017 / Accepted: 5 December 2017 / Published: 12 December 2017
(This article belongs to the Special Issue Meeting of the Spanish Catalysis Society (SECAT’17))
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Abstract

The etherification of glycerol with tert-butyl alcohol in the liquid phase, over different sulfonic acid functionalized zeolites, has been studied. The reaction was carried out using microwaves as a way of heating, measured at autogenous pressure and without any solvent. Dealuminated HY and HZSM-5 zeolites by acid treatment were functionalized with two different organosilica precursors: 3-mercaptopropyltrimethoxysilane (M), which incorporates thiol groups, and 2-(4-chlorosulfonylphenyl)ethyltrimethoxysilane (C), which incorporates the sulfonic acid groups directly. The thiol groups were oxidized into sulfonic groups employing hydrogen peroxide. The textural and structural properties of the solids were studied by XRD and N2 adsorption–desorption isotherms, whereas the incorporation of the organosilica in the zeolites was studied by TGA and XPS. The novelty functionalization of M gave rise to solids with the highest acidity, and exhibited the highest yields with more substituted ethers (Yh-GTBE = 13%), at 75 °C and 15 min of reaction time. In addition to the acidity, the textural properties of the zeolites played an important role in their activity; HY, with the largest size of the channels, were more active than the HZSM-5. View Full-Text
Keywords: zeolite functionalization; organosilica precursor; etherification; glycerol; tert-butyl alcohol; microwave zeolite functionalization; organosilica precursor; etherification; glycerol; tert-butyl alcohol; microwave
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Estevez, R.; Iglesias, I.; Luna, D.; Bautista, F.M. Sulfonic Acid Functionalization of Different Zeolites and Their Use as Catalysts in the Microwave-Assisted Etherification of Glycerol with tert-Butyl Alcohol. Molecules 2017, 22, 2206.

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