Aerobic diol lactonization by Au-nanoparticles supported onto an anion-exchange resin

Werner Oberhauser, Alessandro Lavacchi, Francesco Vizza, Laura Capozzoli, Hon Man Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Different amounts of AuCl4 - (i.e. 3.0, 0.5 and 0.1 wt% of Au) were supported onto the anion-exchange resin Dowex Marathon MSA in its chloride form. A successive rapid reduction of the latter anchored Au-compound with NaBH4 combined with anion exchange reactions (i.e. replacement of chloride by acetate or carbonate) gave resin-stabilized Au-nanoparticles (NPs) of comparable size and size distribution. A screening of the catalytic performance of the obtained heterogenous catalysts in the aerobic oxidation reaction of selected diols to lactones in toluene revealed the carbonate form of the resin bearing 0.1 wt% of Au to be the most active catalytic system. The aerobic oxidation of aliphatic diols led to the formation of the corresponding dicarboxylic acid as side-product, which deactivates the catalyst. By washing the deactivated catalyst after each cycle with a solution of Na2CO3 in water restored the initial catalyst performance for at least four consecutive catalytic cycles.

Original languageEnglish
Pages (from-to)58-64
Number of pages7
JournalApplied Catalysis A: General
Volume451
DOIs
Publication statusPublished - 2013 Jan 31

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Anion Exchange Resins
Ion exchange
Negative ions
Resins
Nanoparticles
Catalysts
Carbonates
Chlorides
Bearings (structural)
Oxidation
Dicarboxylic Acids
Toluene
Lactones
Washing
Anions
Screening
Acetates
Acids
Water

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology

Cite this

Oberhauser, Werner ; Lavacchi, Alessandro ; Vizza, Francesco ; Capozzoli, Laura ; Lee, Hon Man. / Aerobic diol lactonization by Au-nanoparticles supported onto an anion-exchange resin. In: Applied Catalysis A: General. 2013 ; Vol. 451. pp. 58-64.
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Aerobic diol lactonization by Au-nanoparticles supported onto an anion-exchange resin. / Oberhauser, Werner; Lavacchi, Alessandro; Vizza, Francesco; Capozzoli, Laura; Lee, Hon Man.

In: Applied Catalysis A: General, Vol. 451, 31.01.2013, p. 58-64.

Research output: Contribution to journalArticle

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AB - Different amounts of AuCl4 - (i.e. 3.0, 0.5 and 0.1 wt% of Au) were supported onto the anion-exchange resin Dowex Marathon MSA in its chloride form. A successive rapid reduction of the latter anchored Au-compound with NaBH4 combined with anion exchange reactions (i.e. replacement of chloride by acetate or carbonate) gave resin-stabilized Au-nanoparticles (NPs) of comparable size and size distribution. A screening of the catalytic performance of the obtained heterogenous catalysts in the aerobic oxidation reaction of selected diols to lactones in toluene revealed the carbonate form of the resin bearing 0.1 wt% of Au to be the most active catalytic system. The aerobic oxidation of aliphatic diols led to the formation of the corresponding dicarboxylic acid as side-product, which deactivates the catalyst. By washing the deactivated catalyst after each cycle with a solution of Na2CO3 in water restored the initial catalyst performance for at least four consecutive catalytic cycles.

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