Special Issue "Recent Developments in Rh Catalysts"

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

Deadline for manuscript submissions: 15 December 2019.

Special Issue Editors

Guest Editor
Prof. Dr. János Kiss Website E-Mail
Department of Applied and Environmental Chemistry, University of Szeged,Reaction Kinetics and Surface Chemistry Research Group of the Hungarian Academy of Sciences at the University of Szeged, H-6720 Szeged, Rerrich Béla squer. 1,Hungary
Interests: heterogeneous catalytic reactions; surface photochemistry; surface science
Guest Editor
Dr. Imre Kovács Website E-Mail
University of Dunaújváros, Táncsics M. u. 1 H-2401 Dunaújváros, Hungary
Interests: heterogeneous catalytic reactions; surface science; electron spectroscopy; EXAFS; NEXAFS

Special Issue Information

Dear Colleagues,

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 during the reaction is also the subject of this Special Issue.

Prof. Dr. János Kiss
Dr. Imre Kovács
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 1600 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
  • power fuel cell
  • hydrogen production
  • CO and NOx elimination
  • surface modification of Rh
  • strong metal support interaction
  • morphological changes of Rh

Published Papers (1 paper)

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Research

Open AccessFeature PaperArticle
Low Temperature Infrared Study of Carbon Monoxide Adsorption on Rh/CeO2
Catalysts 2019, 9(7), 598; https://doi.org/10.3390/catal9070598 - 11 Jul 2019
Abstract
Fundamental studies of the interaction of adsorbates with metal oxides alone and on which a noble metal is deposited provide information needed for catalytic reactions. Rh/CeO2 is one of the textbook catalysts for many reactions including syngas conversion to ethanol, water gas [...] Read more.
Fundamental studies of the interaction of adsorbates with metal oxides alone and on which a noble metal is deposited provide information needed for catalytic reactions. Rh/CeO2 is one of the textbook catalysts for many reactions including syngas conversion to ethanol, water gas shift reaction (WGSR), and ethanol steam reforming. In this work, the adsorption of CO is studied by infrared (IR) spectroscopy, over CeO2 and 0.6 at. % Rh/CeO2 at a temperature range of 90 to 300 K. CeO2 is in the form of nanoparticles with sizes between 5 and 10 nm and exposing predominantly {111} surface termination in addition to non-negligible fraction of the {100} termination, determined from high resolution transmission electron microscopy (HRTEM). The as prepared Rh/CeO2 contained metallic Rh as well Rh cations in higher oxidation states. At 90 K two IR bands were observed at 2183–2186 and 2161–2163 cm−1, with the former saturating first. The 2163 cm−1 peak was more sensitive to CO pressure than the 2186 cm−1. Heating resulted in the depopulation of the 2163 cm−1 before the 2186 cm−1 peak. The desorption energy computed, assuming a first-order desorption kinetic, was found to be 0.35 eV for the 2186 cm−1 and 0.30 for the 2163 cm−1 IR peak (+/−0.05 eV). The equilibrium constant at 90 K was computed equal to 1.83 and 1.33 Torr−1 for the 2183 and 2161 cm−1, respectively. CO adsorption at 90 K on Rh/CeO2 resulted (in addition to the bands on CeO2) in the appearance of a broad band in the 2110–2130 cm-1 region that contained two components at 2116 and 2126 cm−1. The high frequency of this species is most likely due to adsorption on Rh clusters with very small sizes. The desorption energy of this species was found to be equal to 0.55 eV (+/−0.05 eV). Heating the CO covered Rh/CeO2 surface accelerated the disappearance of CO species over CeO2 and resulted in the appearance of CO2 bands (at about 150 K) followed by carbonate species. At 300 K, the surface was mainly composed of carbonates. Full article
(This article belongs to the Special Issue Recent Developments in Rh Catalysts)
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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: Application of Rhodium Catalysis in Pauson-Khand Type Reactions (tentative)
Author: Nilesh Zaware
Affiliation: Department of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
Correspondence: [email protected]
Abstract: Since its discovery in 1973, the Pauson–Khand reaction (PKR) has attracted considerable attention. This reaction has been utilized as an efficient and atom-economical route to construct synthetically useful cyclopentanone units. Although the PKR was initially catalyzed by cobalt, in the last few decades, transition metals such as zirconium, titanium, ruthenium, palladium and rhodium can also be used in PKRs. A diverse range of rhodium catalysts have been utilized to accomplish the PKR and its variants such as asymmetric PKR, hetero/aza-PKR among others. This review will focuses on the recent advances in Pauson-Khand type reactions that utilize rhodium catalysis.

Title: Thermal and Photocatalytic Activity of Rh Nanoparticles Suppoerted on Titania-like Nanostructure (tentative)
Author: János Kiss
Affiliation: Department of Applied and Environmental Chemistry, University of Szeged, Reaction Kinetics and Surface Chemistry Research Group of the Hungarian Academy of Sciences at the University of Szeged, H-6720 Szeged, Rerrich Béla squer. 1, Hungary
Correspondence: [email protected]

Title: A Cascade Process for the Remediation of Diethylphthalate with TiO2-supported Rh0 Nanoparticles
Author: Alain Roucoux
Affiliation: ENS Chimie de Rennes - UMR CNRS 6226, Equipe Organométalliques, Matériaux et Catalyse, 11, allée de Beaulieu CS 50837, 35 708 RENNES Cedex 7, FRANCE
Correspondence: [email protected]

Title: FTIR Study of the Low Temperature CO Adsorption Modes of CeO2, Rh/CeO2 and Rh-Au/CeO2
Authors: Po-yo Sheng and Hicham Idriss *
Affiliation: SABIC, Corporate Research and Development Center at KAUST, Saudi Arabia; Department of Chemistry, University College London, London, UK
Correspondence: [email protected]

Title: Preferential Size of Rh Nanoclusters on Thin Film Al2O3/NiAl(100)
Author: Meng-Fan Luo
Affiliation: Department of Physics, National Central University, 300 Jhongda Road, Taoyuan 32001, Taiwan
Correspondence: [email protected]

Title: Rh-induced Support Transformation Phenomena in Titania and Titanate Catalysts and Its Influences on the Catalytic Reactions
Authors: János Kiss1,*, András Sápi 2,3and Zoltán Kónya 1,2,4
Affiliation: 1 MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, University of Szeged, Hungary; 2 Department of Applied and Environmental Chemistry, University of Szeged, H-6720 Szeged, Hungary; 3 Institute of Environmental and Technological Sciences, University of Szeged, H-6720 Szeged, Hungary; 4 University of Szeged, Interdisciplinary Excellence Centre, Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1., Szeged, Hungary
Correspondence: [email protected]
Abstract: Rh is one of the most effective metals in several technologically important reactions, mainly in the hydrogenation of CO2, CO, in the CO+H2O reaction, and methane and ethanol transformations. Titania and titanates are the most studied supports for Rh nanoparicles. It is demonstrated in present study that the nature of the support has a marked influence on the specific activity. We pay distinguished attention not only to the electronic interaction between Rh metal and titania and titanate support but also the Rh-induced phase transitions of one-dimensional titanate nanostructures. The structure and morphology of pristine and Rh-decorated nanowires and nanotubes were studied by HRTEM and XRD. The surface chemical composition were studied by XPS and FT infrared and Raman-spectroscopy. For comparison, the morphology of TiO2 was also tested. Support transformation phenomena were observed in Rh-loaded titanates. Rh decorated nanowire transform into the β-TiO2 structure, where their pristine counterparts’ recrystallize into anatase. The formation of anatase was dominant during the thermal annealing process in both acid treated and Rh decorated nanotubes. We pointed out that the phase transformations have influences on the above mentioned reactions.

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