Investigation of sol-gel supported palladium catalysts for Heck coupling reactions in o/w-microemulsions

I. Volovych, Y. Kasaka, M. Schwarze*, Z. Nairoukh, J. Blum, M. Fanun, D. Avnir, R. Schomäcker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Sol-gel supported palladium catalysts are investigated for the Heck coupling reaction between styrene and iodo-/bromobenzene to trans-stilbenes in o/w-microemulsions as alternative reaction medium. High conversions and selectivities are obtained with these catalysts and they show better catalytic performance than their commercial analogs Pd@SiO2 or Pd/C. The influence of the catalyst structure on the activity is investigated in detail showing mass transport limitations that can be optimized by the palladium loading. The catalyst is recyclable >6 times with negligible palladium leaching into the solution. Because of the good recyclability under retention of activity and selectivity, the influence of transport limitations is suppressed and the total catalyst efficiency is increased to more than 2.

Original languageAmerican English
Pages (from-to)210-221
Number of pages12
JournalJournal of Molecular Catalysis A: Chemical
Volume393
DOIs
StatePublished - 1 Nov 2014

Bibliographical note

Funding Information:
We gratefully acknowledge the financial support of this study by Deutsche Forschungsgemeinschaft (DFG) through grant SCHO687/8-2 .

Keywords

  • Heck coupling
  • Microemulsion
  • Palladium acetate
  • Sol-gel method
  • Trans-stilbene

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