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Catalysts
Special Issues
Recent Developments on Ionic Liquids in Catalysis
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Recent Developments on Ionic Liquids in Catalysis

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Environmental Catalysis".

Deadline for manuscript submissions: closed (1 October 2021) | Viewed by 2457

Special Issue Editor

Dr. Karolina Matuszek

E-Mail Website
Guest Editor
School of Chemistry, Clayton, Monash University, VIC 3800, Australia
Interests: Novel ionic liquids; synthesis and properties; acidic ionic liquids; ionic liquids in catalysis; green chemistry; phase change materials; thermal energy storage; renewable energy

Special Issue Information

Dear Colleagues,

Ionic liquids are a class of compounds broadly described as salts that are liquids at ambient temperature and characterized by low vapor pressure and flammability and high thermal and electrochemical stability. Ionic liquids can be fine-tuned to possess the required properties by choosing suitable components from a wide range of available cations and anions. This allows for the design of ionic liquids to be either hydrophobic or hydrophilic, either protic or aprotic, and bearing Brønsted or Lewis acidity or both. All of these properties make ionic liquid particularly interesting for its application in catalysis as a green solvent (as an alternative to volatile organic compounds (VOCs)), as a catalyst, or both. To date, ionic liquids have been successfully applied in dozens of chemical reactions, including oxidation, alkylation, acylation, esterification, hydrogenation, oligomerization, and polymerization. Additionally, the successful commercial application of ionic liquids in processes such as BASIL, HycaPure Hg, and IsoAlky inspires continuous research in this field.

This Special Issue aims to cover the most recent developments and trends in the field of catalysis with ionic liquids. This includes studies on the design, synthesis, and characterization of novel ionic liquids and their applications as catalysts and solvents in homogenous and heterogenous systems.

Dr. Karolina Matuszek
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ionic liquids
  • catalyst
  • homogeneous catalysis
  • heterogeneous catalysis
  • green chemistry

Published Papers (1 paper)

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Research

10 pages, 1215 KiB  
Article
Highly Active Trifloaluminate Ionic Liquids as Recyclable Catalysts for Green Oxidation of 2,3,6-Trimethylphenol to Trimethyl-1,4-Benzoquinone
by Piotr Latos, Agnieszka Siewniak, Natalia Barteczko, Sebastian Jurczyk, Sławomir Boncel and Anna Chrobok
Catalysts 2020, 10(12), 1469; https://doi.org/10.3390/catal10121469 - 16 Dec 2020
Cited by 2 | Viewed by 2017
Abstract
An effective method for the synthesis of 2,3,6-trimethyl-1,4-benzoquinone via the oxidation of 2,3,6-trimethylphenol as the key step in the in the preparation of vitamin E was presented. An aqueous solution of H2O2 was used as the oxidant and Lewis acidic [...] Read more.
An effective method for the synthesis of 2,3,6-trimethyl-1,4-benzoquinone via the oxidation of 2,3,6-trimethylphenol as the key step in the in the preparation of vitamin E was presented. An aqueous solution of H2O2 was used as the oxidant and Lewis acidic trifloaluminate ionic liquids [emim][OTf]-Al(OTf)3, χAl(OTf)3 = 0.25 or 0.15 as catalysts. Trifloaluminate ionic liquids were synthesised by the simple reaction between 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (triflate) [emim][OTf] and aluminium triflate used in sub-stoichiometric quantities. The influence of the reaction parameters on the reaction course, such as the amount and concentration of the oxidant, the amount of catalyst, the amount and the type of organic solvent, temperature, and the reaction time was investigated. Finally, 2,3,6-trimethyl-1,4-benzoquinone was obtained in high selectivity (99%) and high 2,3,6-trimethylphenol conversion (84%) at 70 °C after 2 h of oxidation using a 4-fold excess of 60% aqueous H2O2 and acetic acid as the solvent. The catalytic performance of trifloaluminate ionic liquids supported on multiwalled carbon nanotubes (loading of active phase: 9.1 wt.%) was also demonstrated. The heterogeneous ionic liquids not only retained their activity compared to the homogenous counterparts, but also proved to be a highly recyclable catalysts. Full article
(This article belongs to the Special Issue Recent Developments on Ionic Liquids in Catalysis)
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