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Advances on Catalysts Based on Copper
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Advances on Catalysts Based on Copper

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

Deadline for manuscript submissions: closed (26 December 2022) | Viewed by 15448

Special Issue Editors

Dr. Filippo Bossola

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Guest Editor
Istituto di Scienze e Tecnologie Chimiche “Giulio Natta” - Consiglio Nazionale delle Ricerche, Via C. Golgi, 19 – 20133 Milano, Italy
Interests: hydrogen production; heterogeneous catalysis; reforming; photocatalysis; metal nanoparticles; mixed oxide catalysts
Special Issues, Collections and Topics in MDPI journals
Dr. Nicola Scotti

E-Mail Website
Guest Editor
Istituto di Scienze e Tecnologie Chimiche “Giulio Natta”—Consiglio Nazionale delle Ricerche, Via C. Golgi, 19, 20133 Milano, Italy
Interests: heterogeneous catalysis; metal nanoparticles; biomass valorization; green chemistry; non-noble metal catalysts; mixed oxide catalysts; tuning of the catalysts acid-base properities; hydrogenation/transfer-hydrogenation reactions
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Copper-based catalysts are receiving increasing attention from the scientific community. They show high activity and peculiar selectivity in a wide range of different reactions such as methanol synthesis, steam reforming/WGS, hydrogenations/dehydrogenation/transfer hydrogenation, oxidations, dehydrogenative coupling, acid-base reactions,… These catalytic processes are, more and more, applied to the transformation of renewable feedstocks or platform molecules, such as lignocellulosic biomass, bioalcohols, HMF, furfural and vegetable oils. Therefore, copper catalysts will play an important role in the transition towards a sustainable economy. The properties of copper catalysts can be properly tuned and improved by carefully choosing the preparation method, the support, the presence of a second metal, and the calcination/pre-treatments conditions to boost their performances and stability.

This Special Issue aims to cover the most recent progress and advances in the field of copper-based heterogeneous catalysts, with a special eye on biomass valorisation for the production of high-added value molecules and sustainable energy production.

Dr. Filippo Bossola
Dr. Nicola Scotti
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 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

  • copper catalysts
  • heterogeneous catalysts
  • hydrogen production
  • biomass valorization

Published Papers (6 papers)

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Editorial

Jump to: Research, Review

2 pages, 177 KiB  
Editorial
Editorial: Special Issue on “Advances on Catalysts Based on Copper”
by Filippo Bossola and Nicola Scotti
Catalysts 2023, 13(4), 700; https://0-doi-org.brum.beds.ac.uk/10.3390/catal13040700 - 04 Apr 2023
Viewed by 771
Abstract
Copper-based catalysts are very active in a wide range of different reactions, such as methanol synthesis, steam reforming/WGS, hydrogenation/dehydrogenation/transfer hydrogenation, oxidation, dehydrogenative coupling, acid-base reactions, etc [...] Full article
(This article belongs to the Special Issue Advances on Catalysts Based on Copper)

Research

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11 pages, 3929 KiB  
Communication
Copper Oxide Nanoparticles over Hierarchical Silica Monoliths for Continuous-Flow Selective Alcoholysis of Styrene Oxide
by Marcello Marelli, Federica Zaccheria, Nicoletta Ravasio, Emanuela Pitzalis, Youcef Didi, Anne Galarneau, Nicola Scotti and Claudio Evangelisti
Catalysts 2023, 13(2), 341; https://0-doi-org.brum.beds.ac.uk/10.3390/catal13020341 - 03 Feb 2023
Cited by 1 | Viewed by 1235
Abstract
A simple and reproducible approach for the synthesis of Cu-based heterogeneous catalysts, named flow chemisorption hydrolysis (flow-CH), is reported. The approach, derived from the CH method, allows size-controlled CuO nanoparticles (mean diameter 2.9 nm) to be obtained, that are highly and homogeneously dispersed [...] Read more.
A simple and reproducible approach for the synthesis of Cu-based heterogeneous catalysts, named flow chemisorption hydrolysis (flow-CH), is reported. The approach, derived from the CH method, allows size-controlled CuO nanoparticles (mean diameter 2.9 nm) to be obtained, that are highly and homogeneously dispersed into hierarchically meso-/macroporous silica monoliths. The Cu-based monolithic catalysts (CuO@SiO2-MN, 8.4 wt.% Cu) were studied in the styrene oxide ring opening reaction at 60 °C in the presence of isopropanol, under continuous flow-through conditions. A remarkable activity with a steady-state conversion of 97% for 13 h and 100% selectivity towards the corresponding β-alkoxyalcohol was observed. The performances of CuO@SiO2-MN were higher than those obtained in batch conditions with the previously reported CuO/SiO2 catalysts and with the ground CuO@SiO2-MN monolith in terms of productivity and selectivity. Moreover, a negligible Cu leaching (<0.6 wt.%) in reaction medium was observed. After 13 h CuO@SiO2-MN catalysts could be regenerated by a mild calcination (220 °C) permitting reuse. Full article
(This article belongs to the Special Issue Advances on Catalysts Based on Copper)
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17 pages, 3162 KiB  
Article
Preparing Cu2O/Al2O3 Coating via an Electrochemical Method for the Degradation of Methyl Orange in the Process of Catalytic Wet Hydrogen Peroxide Oxidation
by De-bo Liu, Ping Zhang and Jian Wang
Catalysts 2022, 12(11), 1308; https://0-doi-org.brum.beds.ac.uk/10.3390/catal12111308 - 25 Oct 2022
Cited by 2 | Viewed by 1108
Abstract
To improve the catalytic efficiency and decrease the reaction temperature of wet air oxidation technology, a Cu2O/Al2O3 coating was prepared on the surface of aluminium alloys by anodizing technology, and subsequent heating treatment. Then, the Cu2O/Al [...] Read more.
To improve the catalytic efficiency and decrease the reaction temperature of wet air oxidation technology, a Cu2O/Al2O3 coating was prepared on the surface of aluminium alloys by anodizing technology, and subsequent heating treatment. Then, the Cu2O/Al2O3 coating and 3 wt.% H2O2 was used to degrade methyl orange. The influence of the coating’s microstructure, crystalline component on the degradation rate of the methyl orange was studied. The microstructure of the coating was observed by scanning electron microscope. Results proved that the coating was composed of micropores, and Cu2O was evenly dispersed on the surface and pores in the Al2O3 coating. X-ray diffraction pattern analysis demonstrated Cu2O and Al2O3 characteristic peaks were found after the coating was treated at 300 °C, showing that amorphous Cu2O and Al2O3 were transformed into crystalline oxide. A UV-vis spectrophotometer was used to measure the absorbance of methyl orange, and it was found that the maximum absorption wavelength of methyl orange is 460 nm. At that wavelength, the suitable degradation condition of methyl orange was studied, and results showed that when electrochemical deposition time was 30 min and catalyst dosage was 8 g, the degradation rate of methyl orange could reach 92% at 25 °C for 120 min. Furthermore, when the catalyst was reused 9 times, the degradation rate still reached 75%. Based on the above results, a kinetic equation between the degradation rate of methyl orange and catalyst dosage was derived. The microstructure and crystalline component of the catalyst after different reuse times were characterized, and results showed that the catalytic efficiency of the Cu2O/Al2O3 coating decreased with a decrease in the coating’s specific surface area and the ratio of Cu2O in the coating. Full article
(This article belongs to the Special Issue Advances on Catalysts Based on Copper)
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14 pages, 3052 KiB  
Article
Selective Hydrogenation of 5-Acetoxymethylfurfural over Cu-Based Catalysts in a Flow Reactor: Effect of Cu-Al Layered Double Hydroxides Synthesis Conditions on Catalytic Properties
by Marina V. Bukhtiyarova, Olga A. Bulavchenko, Andrey V. Bukhtiyarov, Alexey L. Nuzhdin and Galina A. Bukhtiyarova
Catalysts 2022, 12(8), 878; https://0-doi-org.brum.beds.ac.uk/10.3390/catal12080878 - 10 Aug 2022
Cited by 6 | Viewed by 1616
Abstract
Cu-containing layered double hydroxides (LDHs) were synthesized by a co-precipitation method at different reaction conditions, such as aging time, pH, precipitation rate and synthesis temperature. The effect of these parameters on the structure and chemical composition of the catalysts were investigated using a [...] Read more.
Cu-containing layered double hydroxides (LDHs) were synthesized by a co-precipitation method at different reaction conditions, such as aging time, pH, precipitation rate and synthesis temperature. The effect of these parameters on the structure and chemical composition of the catalysts were investigated using a set of physical methods, including thermogravimetric analysis (TGA), X-ray diffraction (XRD), H2-TPR and in situ X-ray photoelectron spectroscopy (XPS). It allowed for checking of the reducibility of the samples. 5-Acetoxymethylfurfural was catalytically hydrogenated to 5-(acetoxymethyl)-2-furanmethanol (AMFM) over Cu-containing catalysts synthesized from layered double hydroxides so as to investigate its catalytic properties in flow reaction. It was shown that synthesis pH decreasing from 10 to 8 resulted in rise of AMF conversion that coincided with the higher surface Cu/Al ratio obtained by XPS. Preferable aging time of LDH materials for obtaining the most active catalyst was 2 h, an amount of time that favored the production of the catalyst with high surface Cu/Al ratio up to 0.38. Under optimized reaction conditions, the AMFM yield was 98%. Finally, a synthesis strategy for the preparation of highly efficient Cu-based hydrogenation catalyst with optimized characteristics is suggested. Full article
(This article belongs to the Special Issue Advances on Catalysts Based on Copper)
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Review

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29 pages, 8621 KiB  
Review
Copper-Based Metal–Organic Frameworks (MOFs) as an Emerging Catalytic Framework for Click Chemistry
by Riddima Singh, Gurleen Singh, Nancy George, Gurjaspreet Singh, Sofia Gupta, Harminder Singh, Gurpreet Kaur and Jandeep Singh
Catalysts 2023, 13(1), 130; https://0-doi-org.brum.beds.ac.uk/10.3390/catal13010130 - 06 Jan 2023
Cited by 26 | Viewed by 7641
Abstract
In the extensive terrain of catalytic procedures for the synthesis of organic molecules, metal–organic frameworks (MOFs) as heterogenous catalysts have been investigated in a variety of chemical processes, including Friedel–Crafts reactions, condensation reactions, oxidations, and coupling reactions, and utilized owing to their specific [...] Read more.
In the extensive terrain of catalytic procedures for the synthesis of organic molecules, metal–organic frameworks (MOFs) as heterogenous catalysts have been investigated in a variety of chemical processes, including Friedel–Crafts reactions, condensation reactions, oxidations, and coupling reactions, and utilized owing to their specific properties such as high porosity, tuneability, extraordinary catalytic activity, and recyclability. The eminent copper-tailored MOF materials can be exceptionally dynamic and regioselective catalysts for click reactions (1,3-dipolar cycloaddition reaction). Considering the fact that Cu(I)-catalyzed alkyne–azide cycloaddition (CuAAC) reactions can be catalyzed by several other copper catalysts such as Cu (II)-β-cyclodextrin, Cu(OAc)2, Fe3O4@SiO2, picolinimidoamide–Cu(II) complex, and Cu(II) porphyrin graphene, the properties of sorption and reusability, as well as the high density of copper-MOFs, open an efficient and robust pathway for regimented catalysis of this reaction. This review provides a comprehensive description and analysis of the relevant literature on the utilization of Cu-MOFs as catalysts for CuAAC ‘click’ reactions published in the past decade. Full article
(This article belongs to the Special Issue Advances on Catalysts Based on Copper)
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31 pages, 4116 KiB  
Review
Catalytic Properties of the Spinel-Like CuxMn3−xO4 Copper Manganese Oxides—An Overview
by László Kótai, Vladimir M. Petruševski, Laura Bereczki and Kende Attila Béres
Catalysts 2023, 13(1), 129; https://0-doi-org.brum.beds.ac.uk/10.3390/catal13010129 - 06 Jan 2023
Cited by 6 | Viewed by 2125
Abstract
Copper manganese oxide spinels and related (multiphase) materials with the formula CuxMn3−xO4 are the active catalysts in a wide variety of industrially important processes due to their great diversity in their phase relations, metal ion valence/site distribution, [...] Read more.
Copper manganese oxide spinels and related (multiphase) materials with the formula CuxMn3−xO4 are the active catalysts in a wide variety of industrially important processes due to their great diversity in their phase relations, metal ion valence/site distribution, and chemical properties. In this review, we summarize the preparation methods and their effects on the composition, properties, and catalytic properties of various CuxMn3−xO4 catalysts with various Cu/Mn ratios. The main summarized catalytic reactions are the oxidation of carbon monoxide, nitrogen oxide, and hydrogen sulfide and the oxidative removal of organic solvents such as benzene, toluene, and xylene from the air. Some industrially important reactions (steam reforming of methanol or synthesis gas) and the manufacture of organic chemicals (methyl formate, propylene oxide, and benzyl alcohol) catalyzed by CuxMn3−xO4 spinels are also reviewed. Full article
(This article belongs to the Special Issue Advances on Catalysts Based on Copper)
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