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Zeolite-mediated production of cyclic organic carbonates: Reaction of CO2with styrene oxide on zeolite y impregnated with metal halides

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JournalReaction Chemistry and Engineering
DateAccepted/In press - 1 Mar 2021
DatePublished (current) - 2 Mar 2021
Issue number4
Volume6
Number of pages7
Pages (from-to)672-678
Original languageEnglish

Abstract

Zeolites LiY, NaY, KY and ZnY were impregnated with small amounts of the corresponding metal halides (chloride, bromide and iodide) and tested as catalysts for the carboxylation of styrene oxide with CO2. The KI/KY system was tested at 100 °C and 50 bar and yielded 100% of styrene carbonate, by 1H NMR, within 6 h, whereas KI alone required 15 h to achieve the same yield. The reaction occurs inside the zeolite pores, with the metal cations acting as Lewis acidic centers and the impregnated halides as nucleophiles. Theoretical calculations indicated that chlorides are better stabilized within the zeolite cage than iodides, explaining the reactivity order and suggesting a solvent-like behavior of the zeolite structure. This journal is

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© The Royal Society of Chemistry.

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Copyright 2021 Elsevier B.V., All rights reserved.

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