Microwave-assisted synthesis of sulfonic acid-functionalized microporous materials for the catalytic etherification of glycerol with isobutene
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Document typeArticle
Defense date2013
Rights accessRestricted access - publisher's policy
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Abstract
Commercial Beta, ZSM-5 and mordenite zeolites and commercial montmorillonite K-10 were successfully
sulfonated by a one-step simple method using microwaves. Different amounts of the sulfonating agent
were required to maximize the incorporation of sulfonic groups for each structure. This has been related
to the different dealumination degree suffered by the starting samples during sulfonation together with
the different accessibility of the silanols to the sulfonic groups depending on the arrangement and size
of their pores. All optimised sulfonated catalysts showed total conversion and very high selectivity
(79–91%) to h-GTBE (glycerol di- and tri-ethers), in spite of their microporosity, due to the incorporation
of the sulfonic groups that led to a higher number and strength of Brønsted acid sites. Pore size and
arrangement together with the external surface area of the catalysts affected the accessibility of the acid
sites to the reactants, explaining the evolution of the catalytic results with time for each structure.
CitationGonzález, M. [et al.]. Microwave-assisted synthesis of sulfonic acid-functionalized microporous materials for the catalytic etherification of glycerol with isobutene. "Greenchemistry", 2013, vol. 15, núm. 8, p. 2230-2239.
ISSN1463-9262
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