Catalysis in Ionic Liquid-Supercritical CO2 Systems

Mark J. Muldoon*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)peer-review

4 Citations (Scopus)


The combination of ionic liquids (ILs) and supercritical CO2 (scCO2) allows efficient catalytic processes to be developed. Catalyst separation is generally a major challenge when enzymes or homogeneous organometallic catalysts are utilised for reactions, and IL–scCO2 systems address these separation problems, facilitating the recycling or continual use of the catalyst. Typically these systems involve a catalyst being dissolved in an IL and this is where it remains during the process, with scCO2 extracting the products from the IL (catalyst) phase. ILs and many catalysts are not soluble in scCO2 and this facilitates the clean separation of products from the catalyst and IL. When the pressure is reduced in a collection chamber, the scCO2 returns to CO2 gas and products can be obtained without contamination of catalyst or solvents. It is possible to operate IL–scCO2 systems in a continuous flow manner and this further improves the efficiency and industrial potential of these systems. This chapter will introduce the fundamental properties of these multiphase catalytic systems. It will also highlight key examples of catalytic processes from the academic literature which illustrate the benefits of utilising this combination of solvents for catalysis
Original languageEnglish
Title of host publicationCatalysis in Ionic Liquids: From Catalyst Synthesis to Application
EditorsChris Hardacre, Vasile Parvulescu
PublisherRoyal Society of Chemistry
Number of pages37
ISBN (Electronic)9781849737210
ISBN (Print)9781849736039
Publication statusPublished - 24 Mar 2014

Publication series

NameRSC Catalysis Series

Bibliographical note

Chapter 4

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry


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