Oxidation of Bioethanol using Zeolite-Encapsulated Gold Nanoparticles

Jerrik Jørgen Mielby, Jacob Oskar Abildstrøm, Feng Wang, Takeshi Kasama, Claudia Weidenthaler, Søren Kegnæs

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

With the ongoing developments in biomass conversion, the oxidation of bioethanol to acetaldehyde may become a favorable and green alternative to the preparation from ethylene. Here, a simple and effective method to encapsulate gold nanoparticles in zeolite silicalite-1 is reported and their high activity and selectivity for the catalytic gas-phase oxidation of ethanol are demonstrated. The zeolites are modified by a recrystallization process, which creates intraparticle voids and mesopores that facilitate the formation of small and disperse nanoparticles upon simple impregnation. The individual zeolite crystals comprise a broad range of mesopores and contain up to several hundred gold nanoparticles with a diameter of 2-3nm that are distributed inside the zeolites rather than on the outer surface. The encapsulated nanoparticles have good stability and result in 50% conversion of ethanol with 98% selectivity toward acetaldehyde at 200 degrees C, which (under the given reaction conditions) corresponds to 606molacetaldehyde/molAuhour-1.
Original languageEnglish
JournalAngewandte chemie-international edition
Volume53
Issue number46
Pages (from-to)12513-12516
Number of pages4
ISSN1433-7851
DOIs
Publication statusPublished - 2014

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