Special Issue "Supported Metal Catalysts and Their Applications in Fine Chemicals"

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

Deadline for manuscript submissions: 31 January 2020.

Special Issue Editors

Guest Editor
Dr. Claudio Evangelisti Website E-Mail
CNR – Consiglio Nazionale delle Ricerche; ISTM – Istituto di Scienze e Tecnologie Molecolari Via G. Fantoli 16/15 20138 Milano Italy
Phone: +39 0250995623
Interests: heterogeneous catalysis; homo- and hetero-metallic nanoparticles; selective organic transformations; electron microscopy; materials characterization
Guest Editor
Dr. Alessandro Mandoli Website E-Mail
Department of Chemistry and Industrial Chemistry, University of Pisa, Pisa, Italy
Interests: stereoselective synthesis, metal catalysis, organocatalysis, supported catalysts, flow-chemistry

Special Issue Information

Dear Colleagues,

Catalysis is recognized as a key and unavoidable tool in the development of truly new and efficient chemical reactions, as well as their economic and environmental sustainability. Supported metal catalysts are largely used in the manufacture of a wide range of fine and specialty chemicals including pharmaceuticals, flavor and fragrances, herbicides and pesticides, polymer materials, pigments and dyestuffs, and plastic and rubber additives. In this view, significant efforts have been directed toward the rational design and development of supported metal catalysts using advanced synthetic approaches that allow one to fine-tune the morphology and geometry of the support at nanoscale level and the chemical nature and size of the catalytically active site, as well as its local environment. The rapid development of characterization techniques that are able to reveal the structural, morphological, compositional, and textural properties of catalysts at an atomic level, even in in-situ or operando conditions, resulted in a huge contribution to this goal. Mimicking nature’s enzymes, the new generation of supported metal catalysts offer the possibility to carry out reactions with increased turnover rates and selectivity and, in favorable circumstances, with high stability/recyclability thanks to their very low metal leaching and poisoning.

Combined with this ambitious objective is the progress of other enabling technologies, i.e., techniques that facilitate the preparation of the desired product in the most efficient way and with minimal penalty to the environment. These advancements include the use of non-conventional reaction media, solvent-free reactions, continuous-flow approaches, and alternative energy-transfer methods, such as microwave, photochemical, and sonochemical conditions. Further aspects of current strong interest, in connection with supported metal catalysts, focus on the implementation of multi-step or cascade processes and the exploitation of bio-sustainable feedstocks.

The present Special Issue aims to present the recent development in the synthesis, characterization, and use of supported metal catalysts for chemo-, regio-, and stereoselective organic transformations in the fine and specialty chemicals field. Studies focused on the structure–activity/selectivity relationship in supported metal catalysts, including advanced characterization tools (both ex situ and in situ), are welcome. The issue is open to both original research papers and reviews.

Dr. Claudio Evangelisti
Dr. Alessandro Mandoli
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

  • heterogeneous catalysts
  • immobilized metal catalysts
  • advanced charaterization studies
  • fine and specialty chemicals
  • heterometallic catalysts
  • flow chemistry

Published Papers (3 papers)

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Research

Open AccessArticle
Controllable Acid/Base Propriety of Sulfate Modified Mixed Metal Oxide Derived from Hydrotalcite for Synthesis of Propylene Carbonate
Catalysts 2019, 9(5), 470; https://doi.org/10.3390/catal9050470 - 21 May 2019
Abstract
Ammonium persulfate modified mixed metal oxide derived from hydrotalcite with tunable acid/base properties can be prepared via thermal decomposition of Mg-Al hydrotalcite-type precursors and ammonium persulfate. By controlling the ammonium persulfate content, these sulphur mutated samples, denoted as SMgAlO-y (y = 1; 3; [...] Read more.
Ammonium persulfate modified mixed metal oxide derived from hydrotalcite with tunable acid/base properties can be prepared via thermal decomposition of Mg-Al hydrotalcite-type precursors and ammonium persulfate. By controlling the ammonium persulfate content, these sulphur mutated samples, denoted as SMgAlO-y (y = 1; 3; 5; 7), were investigated in this research. The resulted materials were characterized by XRD, SEM, FT-IR spectra, Py-IR spectra, XPS, Hammett indicator, CO2-TPD, as well as NH3-TPD. Furthermore, the acid-base property of the sample surface was determined by inverse gas chromatography measurements (IGC). Among all the obtained outcomes, the target SMgAlO-5 demonstrated the maximal Ka/Kb value, and it presented the highest activity as a catalyst in the synthesis of propylene carbonate (PC) through 1,2-propylene glycol and urea, giving the yield of 97.2% at the optimized reaction condition, which indicated that the PC yield counted on the synergic effect of the acidity and basicity on catalysts. Full article
(This article belongs to the Special Issue Supported Metal Catalysts and Their Applications in Fine Chemicals)
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Open AccessArticle
Synthesis of MCM-41 Immobilized (Phenoxy)Imine Palladium(II) Complexes as Recyclable Catalysts in the Methoxycarbonylation of 1-Hexene
Catalysts 2019, 9(2), 143; https://doi.org/10.3390/catal9020143 - 02 Feb 2019
Abstract
The immobilization of 2-phenyl-2-((3(tryethoxysicyl)propyl)imino)ethanol (HL1) and 4-methyl-2-(((3(triethoxysilyl)propyl)imino)methyl)phenol (HL2) on MCM-41 afforded the respective ligands HL1-MCM-41 (HL3) and HL2-MCM-41 (HL4). The treatment of complexes Pd(L1)2 and Pd(L2)2 with [...] Read more.
The immobilization of 2-phenyl-2-((3(tryethoxysicyl)propyl)imino)ethanol (HL1) and 4-methyl-2-(((3(triethoxysilyl)propyl)imino)methyl)phenol (HL2) on MCM-41 afforded the respective ligands HL1-MCM-41 (HL3) and HL2-MCM-41 (HL4). The treatment of complexes Pd(L1)2 and Pd(L2)2 with MCM-41 afforded the immobilized complexes (Pd(L1)2)-MCM-41 (1) and (Pd(L2)2)-MCM-41 (2) respectively. Separately, the reactions of HL3 and HL4 with Pd(NCMe)2Cl2 produced the immobilized complexes Pd(HL3)Cl2 (3) and Pd(HL4)Cl2 (4) respectively. The immobilized compounds were characterized by FT-IR, Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), energy-dispersive X-ray (EDX), Thermogravimetric Analysis (TGA) and X-ray Powder Diffraction (XRD). All the complexes (14) formed active catalysts in the methoxycarbonylation of 1-hexene to give linear and branched esters. The catalysts were recycled four times without the loss of catalytic activity. Hot filtration experiments established the absence of leaching, and the heterogeneous nature of the active species was derived from mercury drop experiments. Full article
(This article belongs to the Special Issue Supported Metal Catalysts and Their Applications in Fine Chemicals)
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Open AccessArticle
Selective Oxidation of Glycerol Using 3% H2O2 Catalyzed by Supported Nano-Au Catalysts
Catalysts 2018, 8(11), 505; https://doi.org/10.3390/catal8110505 - 29 Oct 2018
Cited by 1
Abstract
A series of transition metal oxides or mixed oxides supported nano-Au catalysts were prepared for the selective oxidation of glycerol to glyceric acid using 3% H2O2. It was found that the composition and structure of supports significantly influenced the [...] Read more.
A series of transition metal oxides or mixed oxides supported nano-Au catalysts were prepared for the selective oxidation of glycerol to glyceric acid using 3% H2O2. It was found that the composition and structure of supports significantly influenced the catalytic performance of catalysts. The mesoporous trimetal mixed oxide (CuNiAlO) supported nano-Au catalysts were more active in comparison with the others. In the present catalytic system, the highest glycerol conversion was 90.5%, while the selectivity of glyceric acid could reach 72%. Moreover, the catalytic performance remained after 11 times of reaction. Full article
(This article belongs to the Special Issue Supported Metal Catalysts and Their Applications in Fine Chemicals)
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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.

Supported ruthenium as hydrogenation catalyst for production of fine chemicals
Author
: Prof. MO Onani
Affiliation: Inorganic Chemistry, New Chemical Science Building, Rm 3.13, Robert Sobukwe Road, University of the Western Cape, Private Bag X17, Bellvile
Abstract: The continuous production of clean fine chemicals using supported catalysts cannot be over-emphasized. Usually the support is found to have substantial effect on both the selectivity and activity of the bound catalysts. The selective hydrogenation products have been achieved from among others, the supported highly active ruthenium catalysts. These catalysts are broadly used for selective hydrogenation of carbonyl group based compounds particularly those in the vicinity of conjugated or isolated double bonds.  The carbonyl based compounds are some of most known difficult bonds to hydrogenate. Work with this metal has led to the production of a variety of fine chemicals which are important in pharmaceutical, food and agrochemical industries. We shall therefore review many research works that are reported on hydrogenation processes limited to the catalysys by supported ruthenium metal. A few examples of the hydrogenation reactions to be covered include preparation of 1,3-propanediol from 3-hydroxypropanal using ruthenium supported on activated charcoal, preparation of  γ-valerolactone by hydrogenation of levulinic acid catalysed by ruthenium supported on sulfur-doped carbon material, aqueous phase hydrogenation of levulinic acid to γ-valerolactone on supported Ru catalysts prepared by microwave-assisted thermolytic method, preparing carbonyl and alcohol compound by transfer hydrogenation, and many other reactions. We shall also include their preparation techniques, various support materials and their significance, products and applications.

Metal-amyloid complexes as novel catalytic bio-nanomaterials
Authors: Esteban Nova, Rodrigo Diaz-Espinoza
Affiliation: Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
Abstract: Amyloids are fibrillar structures composed of highly ordered protein or peptide monomers stacked through hydrogen-bonded intermolecular contacts. Despite being classically associated to hallmark human pathologies such as Alzheimer’s and Parkinson’s diseases, growing research has shown that nature has exploited the amyloid fold across all kingdoms of life for diverse biological functions due to their unique mechanical properties. Moreover, recent findings have demonstrated that rationally designed short peptides can self-assembly into amyloids that can bind different divalent metals. The resulting metal-amyloid complexes can exhibit catalytic reactivity towards different model compounds, giving rise to metal-decorated assemblies that act as catalytic surfaces. Such rational design approach combines both the mechanical and reactivity properties of amyloids for the generation of novel active bio-nanomaterials that can potentially have diverse applications in the production of fine chemicals.

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