Special Issue "Iridium Catalysts"

A special issue of Catalysts (ISSN 2073-4344).

Deadline for manuscript submissions: 31 July 2019

Special Issue Editors

Guest Editor
Prof. Dr. Ioannis (Yannis) V. Yentekakis

School of Environmental Engineering, Technical University of Crete (Polytechnion Kritis), 73100 Chania, Crete, Greece
Website 1 | Website 2 | E-Mail
Phone: +30-28210-37752
Interests: nano-structured materials and heterogeneous catalysis; thin film electrocatalysts and fuel cells, electrodes and solid electrolytes, materials characterization; materials for energy; materials for environmental protection
Guest Editor
Dr. Georgios Kyriakou

Chemical Engineering and Applied Chemistry, Aston University, Birmingham, UK
Website | E-Mail
Interests: heterogeneous catalysis; photocatalysis; chiral networks; self-assembled systems; sensor technology; electrochemistry

Special Issue Information

Dear Colleagues,

Iridium receives a great deal of research interest due to its remarkable, and in many cases unique, catalytic performance in numerous catalytic reaction systems, embracing both industrial reactions for the large-scale synthesis of commodity chemicals of global importance, as well as reactions that play a critical role in environmental protection and energy generation systems. A short list of Ir-catalyzed reactions of great importance includes:

  • Emissions control catalysis, such as CO and hydrocarbon oxidations and NOx (NO+NO2) reduction at three-way or lean conditions and N2O abatement in the absence or presence of excess oxygen,
  • Steam-, dry(CO2)- or multi-reforming reactions for syngas and/or hydrogen production, implementations in which the high activity of iridium is accompanied by its very low propensity for carbon formation/accumulation –the main problem responsible for reforming catalysts deactivation,
  • Water oxidation electrocatalysis (i.e., oxygen- or hydrogen evolution reaction, HER/OER) that have got much attention in the last few years because of its prime role in water splitting, rechargeable metal-air batteries and fuel cells for electrical power generation, as well as
  • Asymmetric hydrogenation, transfer hydrogenation, allylic substitution and C-H borylation reactions for synthesis of natural products, and so on.

In heterogeneous catalytic applications, Ir currently receives renewed interest as a result of ongoing progress in nanotechnology and catalysts promotion strategies that provide efficient ways to fine-tune the surface morphology and chemistry, further enhancing its catalytic activity and also its time-on-stream stability, even at high temperatures.       

This Special Issue aims to cover recent research progress, both theoretical and experimental, in the field of catalysis by Iridium. Advanced synthesis routes, physicochemical-textural-structural characterization of Ir-based catalytic materials, activity-selectivity-durability evaluation under the titled reactions, fundamental understanding of structure-activity relationships or other metal-metal and metal-support interactions on multifunctional iridium catalysts, as well as computational studies (e.g., DFT calculations), catalytic reactions mechanisms and processes are very welcome.

Prof. Dr. Ioannis V. Yentekakis
Dr. Georgios Kyriakou
Guest Editors

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 papers will be 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 1300 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

  • Ir-catalyzed environmentally important reactions
  • Ir-catalyzed energy important reactions
  • Ir-based nanostructured multifunctional catalysts
  • Ir-catalyzed reactions for synthesis of natural products
  • Surface chemistry and morphology of iridium nano-particles
  • Ir-based hydrogen and oxygen evolution electrocatalysis
  • Ir-electrocatalysts for fuel cells
  • Advanced routes for Ir-catalysts synthesis and design
  • Promotion of Ir catalytic properties

Published Papers

This special issue is now open for submission, see below for planned papers.

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Mechanistic work on iridium catalysed alkyl-imine reduction
Author: Annette Bayer, Department of Chemistry, UiT - The Arctic University of Norway
Abstract: An experimental and computational investigation of the iridium-catalyzed hydrogenation of aliphatic imines is reported. The present study provides support for the Pfaltz cyclometallation hypothesis that aryl imine additives lead to spontaneous formation of an iridacycle that may function as the active catalyst for the hydrogenation of aliphatic imines; however, we find that the iridacycle is unstable at room temperature. The structure of the iridacycle was analyzed via NMR and computational studies, allowing identification of the preferred geometry among the 20 possible isomers. In absence of iridacycle, low conversions and hydrolysed products of aliphatic imines are observed. Our results indicate that the iridacycle is able to suppress hydrolysis, allowing for efficient imine hydrogenation even in presence of stoichiometric amounts of water.

Title: Catalysis, Kinetics and Mechanisms of Organo-Iridium Enantioselective Reactions
Authors: Joseph M. Mwansa and Michael I. Page
Abstract: The synthesis of chiral molecules is of great importance to the pharmaceutical industry, as well as in agrochemicals, flavours and fragrances. The use of organo-iridium complexes are widely used to achieve enantioselective synthesis. Examples include the catalytic reduction of carbonyls and imines; iridium-catalyzed allylic substitution and catalyzed enantioselective hydrogenation of unsaturated carboxylic acids. An important aspect in all these reactions is catalyst loading, reaction times and the degree of enantioselectivity. Understanding the mechanisms of these reactions through kinetic and other studies is vital to improve catalytic efficiency.

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