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 2–3 nm 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 °C, which (under the given reaction conditions) corresponds to 606 mol acetaldehyde/mol Au hour−1.
Original languageEnglish
JournalAngewandte Chemie
Volume126
Issue number46
Pages (from-to)12721 –12724
ISSN0044-8249
DOIs
Publication statusPublished - 2014

Keywords

  • Acetaldehyd
  • Bioethanol
  • Gold‐Nanopartikel
  • Katalytische Oxidationen
  • Zeolithe

Cite this