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Applied Sciences
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Development of Catalytic Systems for Green Chemistry
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Development of Catalytic Systems for Green Chemistry

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Chemical and Molecular Sciences".

Deadline for manuscript submissions: 30 October 2026 | Viewed by 2280

Special Issue Editors

Dr. Magdi El Fergani

E-Mail Website
Guest Editor
Faculty of Chemistry, Department of Inorganic and Organic Chemistry, Biochemistry and Catalysis, University of Bucharest, Bd. Regina Elisabeta Nr. 4-12, 030018 Bucharest, Romania
Interests: heterogeneous catalysis; nanocomposite materials; magnetic nanoparticles; zeolites; biomass valorization; biofuels; metal oxides; oxidation reactions; dehydration reactions; solid surface chemistry
Dr. Natalia Candu

E-Mail Website
Guest Editor
Department of Organic Chemistry, Biochemistry and Catalysis, Faculty of Chemistry, University of Bucharest, Regina Elisabeta Blvd., no. 4-12, 030016 Bucharest, Romania
Interests: heterogeneous catalysis; nanocomposite materials; biomass valorization

Special Issue Information

Dear Colleagues,

One of the primary goals of green chemistry is to design products and processes that minimize the use and generation of hazardous substances. Developing catalytic systems for green chemistry is crucial for sustainable chemical processes. Catalysis enhances reaction efficiency, reduces energy consumption, and lowers waste production. Therefore, research focuses on creating effective and non-toxic catalysts from abundant resources. Heterogeneous catalysts, which are easily separated and reused, offer economic and environmental benefits. Biocatalysts, such as enzymes, provide high specificity and operate under mild conditions, reducing energy use and the need for harsh chemicals. Nano-catalysts, with their large surface area and unique properties, improve reaction rates and selectivity.

Additionally, using renewable feedstocks like biomass and safer aqueous media is a key advancement. These efforts reduce the environmental impact of the chemical industry and support sustainable processes.

Dr. Magdi El Fergani
Dr. Natalia Candu
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 250 words) can be sent to the Editorial Office for assessment.

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. Applied Sciences 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 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

  • green chemistry
  • heterogeneous catalysis
  • nano-catalysts
  • metal oxides catalysis
  • biomass valorization
  • biomolecules

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Published Papers (3 papers)

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Research

27 pages, 5472 KB  
Article
Plant-Assisted Synthesis of ZrO2 Nanoparticles Using Cycas revoluta Extract for Doxycycline Removal from Aqueous Solutions
by Dishant Sharma, Ruchi Bharti, Priya Kaushik, Renu Sharma and Manas Sutradhar
Appl. Sci. 2026, 16(10), 4714; https://doi.org/10.3390/app16104714 - 9 May 2026
Viewed by 242
Abstract
Zirconium oxide nanoparticles (ZrO2 NPs) were synthesized via a plant-assisted route using Cycas revoluta leaf extract as a natural reducing and stabilizing agent. The synthesis and properties of the NPs were confirmed using UV–Vis, FTIR, XRD, SEM-EDS, HR-TEM/SAED, DLS, and zeta potential [...] Read more.
Zirconium oxide nanoparticles (ZrO2 NPs) were synthesized via a plant-assisted route using Cycas revoluta leaf extract as a natural reducing and stabilizing agent. The synthesis and properties of the NPs were confirmed using UV–Vis, FTIR, XRD, SEM-EDS, HR-TEM/SAED, DLS, and zeta potential measurements. The adsorption performance of ZrO2 NPs toward doxycycline from water was investigated by varying pH, adsorbent dose, initial concentration, temperature, and contact time. Under the optimum conditions (pH 7, 50 mg adsorbent in 50 mL, 10 mg L−1 doxycycline, 60 °C, 180 min), a maximum removal efficiency of 60.81% was achieved. The equilibrium data were fitted using the Langmuir model, giving an estimated qmax of 11.276 mg g−1; however, this value should be interpreted cautiously because of the limited number of isotherm data points. The time-dependent adsorption data were empirically described using both pseudo-first-order and pseudo-second-order kinetic models without assigning strict superiority to either model. These results indicate that green-synthesized ZrO2 NPs can serve as a low-impact adsorbent for removal of pharmaceutical contaminants in water. Full article
(This article belongs to the Special Issue Development of Catalytic Systems for Green Chemistry)
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17 pages, 10015 KB  
Article
Ozone Decomposition on MO/Al2O3-CaO (M = Ni, Co, Cu) Catalysts
by Katya I. Milenova, Ivalina Avramova and Katerina Aleksieva
Appl. Sci. 2026, 16(10), 4686; https://doi.org/10.3390/app16104686 - 9 May 2026
Viewed by 133
Abstract
The NiO/Al2O3-CaO, CuO/Al2O3-CaO and CoO/Al2O3-CaO catalytic systems were investigated for the decomposition of ozone. Each of the three different Al2O3-CaO carriers was obtained after treatment of the [...] Read more.
The NiO/Al2O3-CaO, CuO/Al2O3-CaO and CoO/Al2O3-CaO catalytic systems were investigated for the decomposition of ozone. Each of the three different Al2O3-CaO carriers was obtained after treatment of the initial precursor at 1100 °C for 2, 4 and 6 h, respectively, to examine the effect of annealing on support calcination. AAS, XRD, XPS, EPR, SEM and BET were applied for sample characterization. The carrier comprises a mixture of corundum α-Al2O3, θ-Al2O3 and Ca3Al2O3. The XRD spectra of the active phases of the catalysts show the existence of Co3O4, NiO, Ni2O3 and CuO. The SEM micrographs reveal spherical particles for the NiO/Al2O3–CaO sample. In contrast, the CoO/Al2O3–CaO sample exhibits a morphology composed of wool-like fibers and perpendicularly oriented plate-like structures. The CuO/Al2O3–CaO sample consists not only of fibrous structures but also of distinct, separated aggregates. The obtained catalysts have highly developed specific surface areas. Their catalytic activity depends on the calcination conditions of the support, and the best results are observed after 2h treatment for all of the investigated samples due to the smaller crystallite size and higher specific surface area. The activity of the investigated catalysts for the ozone decomposition reaction follows the order NiO/Al2O3-CaO > CoO/Al2O3-CaO > CuO/Al2O3-CaO. Full article
(This article belongs to the Special Issue Development of Catalytic Systems for Green Chemistry)
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21 pages, 3814 KB  
Article
Design and Performance of a Two-Stage Fluidized Bed Reactor for Catalytic Pyrolysis of Mixed Plastic Waste
by Piotr Trochimczyk and Krzysztof Krawczyk
Appl. Sci. 2026, 16(5), 2549; https://doi.org/10.3390/app16052549 - 6 Mar 2026
Viewed by 646
Abstract
With global plastic production creating immense environmental pressure and conventional recycling methods facing limitations, advanced chemical recycling techniques are crucial. This paper presents details of the design, construction, and operation of two fluidized reactors: a laboratory-scale (LS) reactor and a large-scale laboratory reactor [...] Read more.
With global plastic production creating immense environmental pressure and conventional recycling methods facing limitations, advanced chemical recycling techniques are crucial. This paper presents details of the design, construction, and operation of two fluidized reactors: a laboratory-scale (LS) reactor and a large-scale laboratory reactor (LSLR) for the catalytic pyrolysis of mixed plastic waste. A waste stream simulating municipal collection, consisting of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and polystyrene (PS), was processed using a custom Ni/γ-Al2O3 catalyst and an industrial G-0110 catalyst in a two-stage system. The large-scale reactor demonstrated high efficiency, achieving a 90% yield of valuable pyrolysis oil and waxes, a 2% yield of syngas, and an 8% yield of solid residue containing mainly carbon at operating temperatures between 400 and 453 °C. The resulting liquid and wax fractions contained a rich mixture of aliphatic and aromatic hydrocarbons (such as styrene, indene, benzoic acid, toluene, and cumene), confirming their potential as a feedstock for the chemical industry. These results establish that two-stage catalytic pyrolysis in a fluidized bed reactor is a highly effective and promising technology for upcycling mixed plastic waste into valuable resources. Full article
(This article belongs to the Special Issue Development of Catalytic Systems for Green Chemistry)
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