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Special Issue "Application of Green Catalysts in Industrial and Environmental Processes"

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: 31 October 2020.

Special Issue Editor

Dr. Giorgio Vilardi
Website
Guest Editor
Department of Chemical Engineering Materials Environment, Sapienza University of Rome, Rome, Italy
Interests: process intensification; methanation; P2G; exergy; industrial and environmental catalysis; nano-catalysts production; adsorption; plant units design and modelling; process development and scale-up; dynamic modelling; wastewater treatment
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

The use of nanoparticles in both environmental and industrial catalyzed processes has recently undergone to a remarkable growth, considering the increasing number of published papers on these topics. In this framework, the possibility to synthetize the nano-catalysts with green-based reagents and solvents allows the producers to follow and respect the fundamental pillars of the Green Economy. Nanoparticles can be utilized directly as suspended materials and, more often, are supported by other materials. Both industrial and environmental processes, such as catalyzed methanation (Ni, Fe, and Ru-based catalysts), Fischer–Tropsch processes (Fe(0)-based nano-catalysts), heterogeneous fenton, and dehalogenation processes, can be intensified by means of nano-catalysts employment, mainly because of their peculiar properties related to the quantum size effect. In view of sustainable industrial process development, the green production of the used catalysts represents a fundamental step of the whole process.

In this Special Issue, interested researchers are invited to submit original research papers, as well as review articles, on any of the topics related to the production and/or use of green-based catalysts, with a particular focus on nano-sized catalysts.

Dr. Giorgio Vilardi
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 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. Molecules is an international peer-reviewed open access semimonthly 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 2000 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

  • Green processes;
  • Process intensification;
  • Industrial catalysis;
  • Environmental catalysis;
  • Metallic-based catalysts;
  • Nanoparticles and microparticles;
  • Heterogeneous fenton;
  • Catalyzed methanation.

Published Papers (2 papers)

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Research

Open AccessFeature PaperArticle
Preparation of KI/Hydroxyapatite Catalyst from Phosphate Rocks and Its Application for Improvement of Biodiesel Production
Molecules 2020, 25(11), 2565; https://doi.org/10.3390/molecules25112565 - 31 May 2020
Abstract
The main aim of this work was to investigate the suitability of a KI/KIO3 impregnated hydroxyapatite (HAP) catalyst derived from natural phosphate rocks for biodiesel production. This study evaluated the effect of impregnation concentrations (1–6% w/w) on the catalyst [...] Read more.
The main aim of this work was to investigate the suitability of a KI/KIO3 impregnated hydroxyapatite (HAP) catalyst derived from natural phosphate rocks for biodiesel production. This study evaluated the effect of impregnation concentrations (1–6% w/w) on the catalyst performance in biodiesel production. The biodiesel was produced from waste cooking oil (WCO) under simultaneous esterification-transesterification reactions at 60 °C for 6 h. The results showed that the biodiesel yield increased by increasing impregnation concentration and the maximum yield (91.787%) was achieved at an impregnation concentration of 5% w/w. The KI/HAP catalyst showed better performance (91.78% biodiesel yield, 59.1% FAME yield and surface area of 13.513 m2/g) as compared to the KIO3/HAP catalyst (90.07% biodiesel yield, 55.0% FAME yield and surface area of 10.651 m2/g). Full article
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Open AccessArticle
Preparation of Activated Carbon Supported Bead String Structure Nano Zero Valent Iron in a Polyethylene Glycol-Aqueous Solution and Its Efficient Treatment of Cr(VI) Wastewater
Molecules 2020, 25(1), 47; https://doi.org/10.3390/molecules25010047 - 21 Dec 2019
Abstract
Nanometer zero-valent iron (nZVI) has been widely used in the treatment of heavy metals such as hexavalent chromium (Cr(VI)). A novel composite of bead string-structured nZVI on modified activated carbon (nZVI–MAC) is prepared here, using polyethylene glycol as the stable dispersant rather than [...] Read more.
Nanometer zero-valent iron (nZVI) has been widely used in the treatment of heavy metals such as hexavalent chromium (Cr(VI)). A novel composite of bead string-structured nZVI on modified activated carbon (nZVI–MAC) is prepared here, using polyethylene glycol as the stable dispersant rather than traditional ethanol during the loading process. The microstructure characterization shows that nZVI particles are loaded on MAC with a bead string structure in large quantity and stably due to the addition of hydroxyl functional groups on the surface by polyethylene glycol. Experiments on the treatment of Cr(VI) in wastewater show that the reaction process requires only 20 min to achieve equilibrium. The removal rate of Cr(VI) with a low concentration (80–100 mg/L) is over 99% and the maximum saturation removal capacity is up to 66 mg/g. The system converts Cr(VI) to trivalent chromium (Cr(III)) through an oxidation-reduction effect and forms an insoluble material with iron ions by coprecipitation, which is then adsorbed on the surface of the nZVI–MAC. The process conforms to the quasi-second order adsorption kinetics equation (mainly chemical adsorption process). Full article
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