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Reactions
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Feature Papers in Reactions in 2024
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Feature Papers in Reactions in 2024

A special issue of Reactions (ISSN 2624-781X).

Deadline for manuscript submissions: 31 December 2024 | Viewed by 3472

Special Issue Editor

Prof. Dr. Dmitry Yu. Murzin

E-Mail Website
Guest Editor
Faculty of Science and Engineering, Åbo Akademi University, 20500 Turku, Finland
Interests: heterogeneous catalysis; catalytic reaction engineering; biomass valorization
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue, entitled “Feature Papers in Reactions in 2024”, is open to receiving high-quality papers in open access format on the invitation of Editorial Board Members, or those invited by the Editorial Office and the Editor-in-Chief. Both original research articles and comprehensive review papers are welcome. Contributions to this Special Issue will be published in open access format after peer review. The potential topics include, but are not limited to, the following:

  • Reaction mechanisms;
  • Reaction kinetics;
  • Complex reactions, including catalytic ones;
  • Single-atom catalysis;
  • Reaction and reactor engineering (bio-, electro-, photo-, environmental, and chemical);
  • Micro-reactors and micro-reaction engineering;
  • Hydrogen production reactions;
  • Photocatalysis.

Prof. Dr. Dmitry Yu. Murzin
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. Reactions is an international peer-reviewed open access quarterly 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 1000 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

  • reaction mechanisms
  • reaction kinetics
  • complex reactions, including catalytic ones
  • single-atom catalysis
  • reaction and reactor engineering (bio-, electro-, photo-, environmental, and chemical)
  • micro-reactors and micro-reaction engineering
  • hydrogen production reactions
  • photocatalysis

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Published Papers (2 papers)

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Research

16 pages, 2142 KiB  
Article
Investigation of Acetoin Biosynthesis by Bacillus subtilis ACA-DC 1176 Growing on Crude Glycerol in Flask and Bioreactor Trials
by Dimitris Karayannis, Eleni Moraiti, Ourania Kalantzi and Seraphim Papanikolaou
Reactions 2024, 5(4), 664-679; https://doi.org/10.3390/reactions5040034 - 1 Oct 2024
Viewed by 1191
Abstract
Acetoin biosynthesis by two Bacillus subtilis strains valorising crude glycerol was thoroughly explored within a pre-defined range of culture conditions and systems. B. subtilis ACA-DC 1176 stood out for its higher efficiency in acetoin production, prompting an investigation into the potential for enhanced [...] Read more.
Acetoin biosynthesis by two Bacillus subtilis strains valorising crude glycerol was thoroughly explored within a pre-defined range of culture conditions and systems. B. subtilis ACA-DC 1176 stood out for its higher efficiency in acetoin production, prompting an investigation into the potential for enhanced productivity through the evaluation of diverse culture conditions and media compositions. The primary by-products of the biodiesel and corn industries, namely crude glycerol and corn steep liquor, respectively, were successfully employed as the principal carbon and nitrogen sources of the newly developed low-cost culture medium. Furthermore, the results of the various feeding strategies that were tested indicated that the conversion of 2,3-butanediol (BDO) to acetoin occurred exclusively when the concentration of glycerol was below approximately 5 g/L. This seemed to be necessary for the production of NADH, which is essential for maintaining cellular processes. Following the complete depletion of glycerol, acetic acid increased and became the predominant metabolite, while both acetoin and BDO decreased, presumably resulting in ATP generation. This is likely a mechanism employed by the cell to generate energy in the absence of a carbon source. In the fed-batch bioreactor culture, the kinetics of metabolites differed, as there was no conversion of BDO to acetoin at the final depletion of glycerol. At volumetric mass transfer coefficient (kLa) levels exceeding approximately 70 1/h, the production of acetoin was favoured over that of BDO, with the highest observed acetoin/BDO ratio reaching 4.29 g/g. Conversely, at kLa values below approximately 60 1/h, the titres of acetoin and BDO were found to be nearly equal. The final concentrations of acetoin and BDO reached 36.0 g/L and 25.5 g/L, respectively, resulting in a total yield of both (acetoin + BDO) per glycerol consumption of 0.40 g/g. To the best of our knowledge, this is the first study to focus on acetoin production from crude glycerol fermentative valorisation. The study presents new findings regarding the parameters influencing the level of BDO conversion to acetoin. However, further research is required in order to gain a comprehensive understanding of the underlying phenomena and metabolic pathways involved. Full article
(This article belongs to the Special Issue Feature Papers in Reactions in 2024)
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13 pages, 817 KiB  
Article
Generalized Linear Driving Force Formulas for Diffusion and Reaction in Porous Catalysts
by Mirosław K. Szukiewicz and Elżbieta Chmiel-Szukiewicz
Reactions 2024, 5(2), 305-317; https://doi.org/10.3390/reactions5020015 - 29 Apr 2024
Cited by 1 | Viewed by 1295
Abstract
Approximate models are a fast and most often precise tool for determining the effectiveness factor for heterogeneous catalysis processes that are realized in the real world. They are also frequently applied as robust transient models describing the work of a single catalyst pellet [...] Read more.
Approximate models are a fast and most often precise tool for determining the effectiveness factor for heterogeneous catalysis processes that are realized in the real world. They are also frequently applied as robust transient models describing the work of a single catalyst pellet or as a part of a more complex model, for example, a reactor model, where mass balances for the gas phase and solid phase are necessary. So far, approximate models for diffusion and reaction processes have been presented for processes described by a single balance equation. In the present work, approximate models without the mentioned limitation are presented and discussed. In addition, simple rules are shown for the development of other complex approximate models without tedious derivation in the complex domain. The formulas considered in this work are typical long-time approximations of the transient process. The accuracy is good, especially in the range of small and intermediate Thiele modulus values. Full article
(This article belongs to the Special Issue Feature Papers in Reactions in 2024)
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