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Journals
Catalysts
Special Issues
Recent Developments in Rh Catalysts II
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Recent Developments in Rh Catalysts II

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

Deadline for manuscript submissions: closed (15 May 2023) | Viewed by 4294

Special Issue Editor

Dr. Imre Kovács

E-Mail Website
Guest Editor
Institute of Technology, University of Dunaújváros, Táncsics M. u. 1, H-2401 Dunaújváros, Hungary
Interests: reaction on surfaces; CO2 hydrogenation; hydrogen adsorption; storage of H2 in chemical compounds; transformation of CHxOy compounds; photochemistry; electron spectroscopy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This is the second edition of the Special Issue "Recent Developments in Rh Catalysts". This Special Issue of Catalysts is devoted to Rh and Rh-related catalysts, which play an outstanding role in many technologically important catalytic reactions. Recently, Rh has been receiving considerable attention because of its high catalytic potential for producing hydrogen from hydrogen-containing molecules to power fuel cells. Catalytic reactions of oxygenated hydrocarbons as end products and as reactants have been the focus of studies for decades, with publications dating back to the early seventies. Hydrogenation of CO and CO2  to form hydrocarbons and oxygenated products over supported and unsupported Rh has been the subject of extensive research of Rh and Rh-containing catalysts. Supported Rh catalysts are promising candidates in the thermal and photocatalytic reduction of CO2 with hydrogen and with different saturated and unsaturated hydrocarbons. The reactions of CO2, an interesting and attractive C1 building block, not only contribute to alleviating global climate change induced by the increasing CO2 emissions, but also open up new sustainable routes for synthesizing useful feedstock chemicals and fuels. Rh supported on oxide supports is an excellent catalyst for environmentally important technologies, such as CO oxidation and NOx reduction. This issue would supply the catalytic community with the present status of Rh-related catalysts exhibited in many catalytic reactions. This volume involves studies relating to the catalytic effects of Rh in a wide reaction scale, the modification of Rh surfaces, and the interaction mechanism between Rh and support, including the strong metal interactions and its importance in the catalytic reactions. Special attention will be given to the promoting effect of a small amount of Rh in the catalytic behavior of supported metal catalysts, including the formation of alloy in bimetallic systems, on different supports. The study of morphological changes of Rh on support surface or in core-shell particle during the reaction is also the subject of this Special Issue.

Dr. Imre Kovács
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

  • Rh catalysts
  • catalytic effect of Rh
  • promoter effect of Rh
  • bimetallic catalysts
  • core-shell structured particles, power fuel cell
  • hydrogen production
  • CO and NOx elimination
  • surface modification of Rh
  • strong metal support interaction morphological changes of Rh

Related Special Issue

Published Papers (2 papers)

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Research

18 pages, 2707 KiB  
Article
Structure and Surface Behavior of Rh Complexes in Ionic Liquids Studied Using Angle-Resolved X-ray Photoelectron Spectroscopy
by Daniel Hemmeter, Ulrike Paap, Florian Maier and Hans-Peter Steinrück
Catalysts 2023, 13(5), 871; https://doi.org/10.3390/catal13050871 - 11 May 2023
Cited by 2 | Viewed by 2306
Abstract
We present an ARXPS study on the surface composition and interfacial behavior of commercial [Rh(COD)2][TfO] in [C2C1Im][TfO], [C4C1Im][TfO], [C8C1Im][TfO], and [C2C1Im][EtOSO3]. The complex [...] Read more.
We present an ARXPS study on the surface composition and interfacial behavior of commercial [Rh(COD)2][TfO] in [C2C1Im][TfO], [C4C1Im][TfO], [C8C1Im][TfO], and [C2C1Im][EtOSO3]. The complex was found to be non-intact in a solution of these ILs through the loss of COD ligands, accompanied by the depletion of the metal center from the IL/vacuum interface. Increasing the chain length of the aliphatic substituent on the imidazolium cation of the [TfO]−-based ILs led to a more pronounced depletion from the interface, due to the higher surface affinity of the solvent cations with the longer alkyl chains. The loss of COD ligands offered facile in situ ligand substitution with surface-active TPPTS to afford a moderate increase in the surface concentration of Rh. We propose the formation of a Schrock−Osborn-type catalyst [Rh(COD)(TPPTS)2][TfO]. Information on the surface composition and targeted design of the gas/IL interface is highly relevant for applications in IL-based catalytic systems, such as in supported ionic liquid phase (SILP) catalysis. Full article
(This article belongs to the Special Issue Recent Developments in Rh Catalysts II)
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14 pages, 2652 KiB  
Article
Rh-Catalyzed Environmentally Benign Selective Hydrogenation of a Broad Variety of Functional Groups Using Al-Water as a Hydrogen Source
by Guoshu Xie and Béla Török
Catalysts 2022, 12(12), 1578; https://doi.org/10.3390/catal12121578 - 05 Dec 2022
Cited by 1 | Viewed by 1649
Abstract
Supported rhodium catalysts were screened to catalyze the one-step hydrogenation of a broad variety of functional groups. The results show that 5% Rh/Al2O3 and 5% Rh/C performed well in controlling selective hydrogenation under the desired amount of time and temperature. [...] Read more.
Supported rhodium catalysts were screened to catalyze the one-step hydrogenation of a broad variety of functional groups. The results show that 5% Rh/Al2O3 and 5% Rh/C performed well in controlling selective hydrogenation under the desired amount of time and temperature. In this regard, partial and full hydrogenation were achieved by controlling reaction time or temperature. In addition to aliphatic C–C, C–N, C–O, and N–O multiple bonds, the applicability of this method was demonstrated by the hydrogenation of C=C double bonds of arenes, which is considered challenging. Importantly, the Al-H2O system producing hydrogen in situ and the high, controllable selectivity make this protocol environmentally benign and highly efficient. Full article
(This article belongs to the Special Issue Recent Developments in Rh Catalysts II)
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