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Catalysts
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Catalytic Reaction Engineering for the Sustainability of the Environment
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Catalytic Reaction Engineering for the Sustainability of the Environment

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

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 13861

Special Issue Editor

Dr. Michael Nigra

E-Mail Website
Guest Editor
Department of Chemical Engineering, University of Utah, Salt Lake City, UT 84112, USA
Interests: C1 conversion catalysis; catalysis with gold; enzymatic catalysis; sustainable chemistry; nanomaterials synthesis

Special Issue Information

 Dear Colleagues, 

The field of catalysis has addressed and is poised to continue to address important issues in sustainability. As catalysts lower the energy requirements for a reaction or alter the selectivity for certain products, advances in catalysis very often lead to more sustainable chemical processes. This Special Issue calls for papers that will focus on recent advances where catalysts and reactor engineering have improved the sustainability of a chemical process. Areas of interest include carbon dioxide capture and conversion, automotive emissions control, biomass processing, new ammonia synthesis routes, chemical recycling of polymers, methane conversion, and photocatalytic processes. Contributions from areas not specifically listed here are also welcome. Both experimental and theoretical contributions are encouraged for submission.

Dr. Michael Nigra
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 2200 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

  • CO2 capture
  • CO2 conversion
  • environmental catalysis
  • emission control
  • sustainability
  • green chemical engineering

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Published Papers (3 papers)

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Research

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11 pages, 3295 KiB  
Article
Surfactant- and Ligand-Free Synthesis of Platinum Nanoparticles in Aqueous Solution for Catalytic Applications
by Rashmi P. Charde, Brian van Devener and Michael M. Nigra
Catalysts 2023, 13(2), 246; https://doi.org/10.3390/catal13020246 - 21 Jan 2023
Cited by 8 | Viewed by 3524
Abstract
The synthesis of surfactant-free and organic ligand-free metallic nanoparticles in solution remains challenging due to the nanoparticles’ tendency to aggregate. Surfactant- and ligand-free nanoparticles are particularly desirable in catalytic applications as surfactants, and ligands can block access to the nanoparticles’ surfaces. In this [...] Read more.
The synthesis of surfactant-free and organic ligand-free metallic nanoparticles in solution remains challenging due to the nanoparticles’ tendency to aggregate. Surfactant- and ligand-free nanoparticles are particularly desirable in catalytic applications as surfactants, and ligands can block access to the nanoparticles’ surfaces. In this contribution, platinum nanoparticles are synthesized in aqueous solution without surfactants or bound organic ligands. Pt is reduced by sodium borohydride, and the borohydride has a dual role of reducing agent and weakly interacting stabilizer. The 5.3 nm Pt nanoparticles are characterized using UV-visible spectroscopy and transmission electron microscopy. The Pt nanoparticles are then applied as catalysts in two different reactions: the redox reaction of hexacyanoferrate(III) and thiosulfate ions, and H2O2 decomposition. Catalytic activity is observed for both reactions, and the Pt nanoparticles show up to an order of magnitude greater activity over the most active catalysts reported in the literature for hexacyanoferrate(III)/thiosulfate redox reactions. It is hypothesized that this enhanced catalytic activity is due to the increased electron density that the surrounding borohydride ions give to the Pt nanoparticle surface, as well as the absence of surfactants or organic ligands blocking surface sites. Full article
(This article belongs to the Special Issue Catalytic Reaction Engineering for the Sustainability of the Environment)
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14 pages, 1276 KiB  
Article
Impact of Design on the Activity of ZrO2 Catalysts in Cellulose Hydrolysis-Dehydration to Glucose and 5-Hydroxymethylfurfural
by Tatiana B. Medvedeva, Olga L. Ogorodnikova, Irina S. Yakovleva, Lyubov A. Isupova, Oxana P. Taran, Nikolay V. Gromov and Valentin N. Parmon
Catalysts 2021, 11(11), 1359; https://doi.org/10.3390/catal11111359 - 12 Nov 2021
Cited by 8 | Viewed by 2171
Abstract
The one-pot hydrolysis-dehydration of activated microcrystalline cellulose was studied in pure hydrothermal water at 453 K over ZrO2 catalysts produced by thermodegradation, microwave treatment, mechanical activation, and sol–gel methods and spent without any co-catalyst. ZrO2 prepared by microwave treatment was more [...] Read more.
The one-pot hydrolysis-dehydration of activated microcrystalline cellulose was studied in pure hydrothermal water at 453 K over ZrO2 catalysts produced by thermodegradation, microwave treatment, mechanical activation, and sol–gel methods and spent without any co-catalyst. ZrO2 prepared by microwave treatment was more active compared to ones derived by other methods. The catalyst calcination temperature also impacted reactivity. The cellulose conversion increased simultaneously with acidity and SBET, which in turn were set by the preparation method and calcination temperature. Phase composition did not affect the activity. Yields of glucose and 5-HMF reaching 18 and 15%, respectively, were over the most promising ZrO2 prepared by microwave treatment at 593 K. To our knowledge, this ZrO2 sample provided the highest activity in terms of TOF values (15.1 mmol g−1 h−1) compared to the pure ZrO2 systems reported elsewhere. High stability of ZrO2 derived by microwave irradiation was shown in five reaction runs. Full article
(This article belongs to the Special Issue Catalytic Reaction Engineering for the Sustainability of the Environment)
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Review

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17 pages, 1501 KiB  
Review
Low-Temperature SCR Catalyst Development and Industrial Applications in China
by Hongtai Zhu, Liyun Song, Kai Li, Rui Wu, Wenge Qiu and Hong He
Catalysts 2022, 12(3), 341; https://doi.org/10.3390/catal12030341 - 17 Mar 2022
Cited by 27 | Viewed by 7310
Abstract
In recent years, low-temperature SCR (Selective Catalytic Reduction) denitrification technology has been popularized in non-power industries and has played an important role in the control of industrial flue gas NOx emissions in China. Currently, the most commonly used catalysts in industry are [...] Read more.
In recent years, low-temperature SCR (Selective Catalytic Reduction) denitrification technology has been popularized in non-power industries and has played an important role in the control of industrial flue gas NOx emissions in China. Currently, the most commonly used catalysts in industry are V2O5-WO3(MoO3)/TiO2, MnO2-based catalysts, CeO2-based catalysts, MnO2-CeO2 catalysts and zeolite SCR catalysts. The flue gas emitted during industrial combustion usually contains SO2, moisture and alkali metals, which can affect the service life of SCR catalysts. This paper summarizes the mechanism of catalyst poisoning and aims to reduce the negative effect of NH4HSO4 on the activity of the SCR catalyst at low temperatures in industrial applications. It also presents the outstanding achievements of domestic companies in denitrification in the non-power industry in recent years. Much progress has been made in the research and application of low-temperature NH3-SCR, and with the renewed demand for deeper NOx treatments, new technologies with lower energy consumption and more functions need to be developed. Full article
(This article belongs to the Special Issue Catalytic Reaction Engineering for the Sustainability of the Environment)
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