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Symmetry
Special Issues
Heterogeneous Catalysis for More Sustainable Symmetry Development
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Heterogeneous Catalysis for More Sustainable Symmetry Development

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Chemistry: Symmetry/Asymmetry".

Deadline for manuscript submissions: closed (28 February 2022) | Viewed by 5950

Special Issue Editors

Dr. Sabino Armenise

E-Mail Website
Guest Editor
MarieCurieAction, Rey Juan Carlos University, Madrid, Spain
Interests: plastic-to-X; pyrolysis; computational modeling; magnetic nanoparticles; zeolite; mesocelluar foam; carbon based materials; biomass conversion
Prof. Dr. Franck Launay

E-Mail Website
Guest Editor
UMR 7197, Laboratoire de Réactivité de Surface (LRS), Centre National de la Recherche Scientifique, Sorbonne Université, 75252 Paris, France
Interests: utilization of porous materials for the design of selective and stable catalysts; valorization of alkenes, CO2, and biomass; supported homogeneous catalysts (organocatalysts, metal complexes, polyoxometalates or even enzymes); supported heterogeneous catalysts (zero-valent metal/metal oxide colloids)
Special Issues, Collections and Topics in MDPI journals
Dr. Marta Muñoz

E-Mail Website
Guest Editor
CIM-URJC research group, Rey Juan Carlos University, Madrid, Spain
Interests: hydrocracking; plastic waste conversion; nanoparticles; magnetic heating

Special Issue Information

Dear Colleagues,

Thinking from a symmetry point of view is important to overcome several challenges that our world is currently faced with, especially in the fields of energy and the environment. For this purpose, it is necessary to take advantage of and integrate different disciplines to solve worldwide problems, such as energy demand and supply, air pollution, plastic recycling and wastewater treatment, among many other issues. Recent emphasis on the circular economy has also highlighted the need to change our mindset about how we see “waste” and to consider it more like a feedstock to produce new products, goods, and services. In this context, this Special Issue of Symmetry aims to collect the latest efforts focused on developing new energy-efficient integrated chemical, catalytic conversion, and separation approaches that could accelerate the transformation and improvement of our lifestyle for a more symmetrical world.

Dr. Sabino Armenise
Prof. Dr. Franck Launay
Dr. Marta Muñoz
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. Symmetry 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 2400 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 catalysis
  • plastic-to-fuel
  • energy
  • nanomaterials
  • process intensification
  • waste-to-resources
  • CO2 valorization
  • biomass valorization
  • air pollution abatement
  • symmetry valorization

Published Papers (2 papers)

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Research

12 pages, 3248 KiB  
Article
Comparative Study: Catalytic Activity and Rhodamine Dye Luminescence at the Surface of TiO2-Based Nanoheterostructures
by Elizaveta Konstantinova, Vladimir Zaitsev, Artem Marikutsa and Alexander Ilin
Symmetry 2021, 13(9), 1758; https://doi.org/10.3390/sym13091758 - 21 Sep 2021
Cited by 3 | Viewed by 1514
Abstract
Nanoheterostructures based on titanium, molybdenum, tungsten, and vanadium nanooxides with symmetric crystal structures, morphologies and high photocatalytic activity in under illumination by visible light, have been synthesized and studied. Microscopy, optical spectroscopy, and electron-spin resonance techniques were used. The asymmetric separation of photo-generated [...] Read more.
Nanoheterostructures based on titanium, molybdenum, tungsten, and vanadium nanooxides with symmetric crystal structures, morphologies and high photocatalytic activity in under illumination by visible light, have been synthesized and studied. Microscopy, optical spectroscopy, and electron-spin resonance techniques were used. The asymmetric separation of photo-generated holes and electrons between different nanooxides in their nanoheterostructures suppresses their recombination. Using the method developed by the authors and based on ESR spectroscopy, the energy levels of the active centers inside the band gaps of the studied samples were found. We have shown, for the first time, that under illumination of nanoheterostructures under asymmetric conditions with adsorbed rhodamine dye at the dye-absorption wavelength (500 nm), photocatalytic reactions are mainly determined by light absorption by the nanostructures themselves, and not by energy transfer from the dye. This important result shows that high photocatalytic activity of materials with symmetric crystal structures is the primary criterion for creating energy-efficient photocatalysts. The results will be useful for the development of energy-efficient catalytic devices based on various combinations of metal nanooxides. Full article
(This article belongs to the Special Issue Heterogeneous Catalysis for More Sustainable Symmetry Development)
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22 pages, 6195 KiB  
Article
Optimization of Fuel Injection Parameters of Moringa oleifera Biodiesel-Diesel Blend for Engine-Out-Responses Improvements
by Yew Heng Teoh, Heoy Geok How, Farooq Sher, Thanh Danh Le, Hwai Chyuan Ong, Huu Tho Nguyen and Haseeb Yaqoob
Symmetry 2021, 13(6), 982; https://doi.org/10.3390/sym13060982 - 1 Jun 2021
Cited by 10 | Viewed by 2724
Abstract
Biodiesel has gained popularity in diesel engines as a result of the rapid decline of fossil fuels and population growth. The processing of biodiesel from non-edible Moringa Oleifera was investigated using a single-step transesterification technique. Both fuels had their key physicochemical properties measured [...] Read more.
Biodiesel has gained popularity in diesel engines as a result of the rapid decline of fossil fuels and population growth. The processing of biodiesel from non-edible Moringa Oleifera was investigated using a single-step transesterification technique. Both fuels had their key physicochemical properties measured and investigated. In a common-rail diesel engine, the effects of MB50 fuel blend on the symmetric characteristics of engine-out responses were evaluated under five load settings and at 1000 rpm. As compared to standard diesel, MB50 increased brake thermal efficiency (BTE), and nitrogen oxides (NOx) emissions while lowering brake specific fuel consumption (BSFC), and smoke emissions for all engine loads. A further study of injection pressure and start of injection (SOI) timing for MB50 fuel was optimized using response surface methodology (RSM). The RSM optimization resulted in improved combustion dynamics due to symmetry operating parameters, resulting in a simultaneous decrease in NOx and smoke emissions without sacrificing BTE. RSM is an efficient optimization method for achieving optimal fuel injection parameter settings, as can be deduced. As a result, a clearer understanding of the use of MB50 fuel in diesel engines can be given, allowing for the best possible engine efficiency. Full article
(This article belongs to the Special Issue Heterogeneous Catalysis for More Sustainable Symmetry Development)
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