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Special Issue Editors

Dr. Anna Gancarczyk

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Guest Editor

Institute of Chemical Engineering, Polish Academy of Sciences, Bałtycka 5, 44-100 Gliwice, Poland
Interests: structured reactors; chemical reaction engineering; chemical reactor design; modeling and simulation
Special Issues, Collections and Topics in MDPI journals

Dr. Agnieszka Ciemięga

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Guest Editor

Institute of Chemical Engineering of the Polish Academy of Sciences, Gliwice, Poland
Interests: flow microreactors; functional porous materials; heterogeneous catalysts; applied aspects of catalysis

Special Issue Information

Dear Colleagues,

The rising demand for environmental protection has led to an intensive search for more effective solutions characterized by, for example, higher selectivity or yield, lower energy consumption, and an even more compact geometry in catalytic converters. Therefore, researchers are still trying to develop active catalysts using effective techniques for catalyst deposition (e.g., sonochemical) as well as new catalyst supports characterized by a favourable trade-off between mass (heat) transfer and flow resistance (e.g., wire meshes, short monoliths, and solid foams).

Therefore, the aim of the present Special Issue is to collect recent and the most up to date reports on the development, optimization, and testing of catalytic reactors, especially (but not only) those used in environmental protection processes at every stage of their design, from the microscale (e.g., identification of molecules involved in a unitary elementary act, surface analysis, and determining the reaction mechanism) to the mesoscale (preparation and catalyst deposition) and the macroscale (reactor design and modeling) and to application tests. Broad contributions, including experimental and computational studies, would be valuable subjects of this Special Issue.

Dr. Anna Gancarczyk
Dr. Agnieszka Ciemięga
Guest Editors

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Related Special Issue

Published Papers (2 papers)

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Research

12 pages, 5957 KiB

Open AccessFeature PaperArticle

Insight into Structural and Physicochemical Properties of ZrO₂-SiO₂ Monolithic Catalysts with Hierarchical Pore Structure: Effect of Zirconium Precursor

by Katarzyna Maresz, Agnieszka Ciemięga, Patryk Bezkosty, Kamil Kornaus, Maciej Sitarz, Maciej Krzywiecki and Julita Mrowiec-Białoń

Catalysts 2023, 13(12), 1516; https://doi.org/10.3390/catal13121516 - 16 Dec 2023

Viewed by 863

Abstract

Zirconia–silica monolithic catalysts with hierarchical micro/macroporous structure were obtained in a sol-gel process combined with phase separation using inorganic salts, i.e., oxychloride, oxynitrate and sulphate, as a zirconium source. It was found that the use of zirconium oxychloride and prehydrolysis of tetraethoxysilane (TEOS) resulted in materials characterized by a well-developed continuous structure of macropores with a diameter of ca. 10 μm. For zirconium oxynitrate and sulfate modified materials, the prehydrolysis hardly affected the macropore size. The micropores with a diameter of 1.5 nm in the skeleton of all materials provided a large surface area of 550–590 m²/g. A high dispersion of zirconia in the silica skeleton in all studied materials was shown. However, the largest surface concentration of Lewis and Brönsted acid sites was found in the monolith synthesized with zirconium oxychloride. The monoliths were used as a core for continuous-flow microreactors and high catalytic activity was confirmed in the deacetalization of benzylaldehyde dimethyl acetal. The process was characterized by a high efficiency at low temperature, i.e., 35 °C. Full article

(This article belongs to the Special Issue Modern Catalytic Reactor: From Active Center to Application Tests, 2nd Edition)

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13 pages, 2812 KiB

Open AccessArticle

Co-Immobilization of D-Amino Acid Oxidase, Catalase, and Transketolase for One-Pot, Two-Step Synthesis of L-Erythrulose

by Daria Świętochowska, Aleksandra Łochowicz, Nazim Ocal, Loredano Pollegioni, Franck Charmantray, Laurence Hecquet and Katarzyna Szymańska

Catalysts 2023, 13(1), 95; https://doi.org/10.3390/catal13010095 - 03 Jan 2023

Cited by 3 | Viewed by 1715

Abstract

Here, we present an immobilized enzyme cascade in a basket-type reactor allowing a one-pot, two-step enzymatic synthesis of L-erythrulose from D-serine and glycolaldehyde. Three enzymes, D-amino acid oxidase from Rhodotorula gracilis (DAAO_Rg), catalase from bovine liver (CAT), and transketolase from Geobacillus stearothermophilus (TK_gst) were covalently immobilized on silica monolithic pellets, characterized by an open structure of interconnected macropores and a specific surface area of up to 300 m²/g. Three strategies were considered: (i) separate immobilization of enzymes on silica supports ([DAAO][CAT][TK]), (ii) co-immobilization of two of the three enzymes followed by the third ([DAAO+CAT][TK]), and (iii) co-immobilization of all three enzymes ([DAAO+CAT+TK]). The highest L-erythrulose concentrations were observed for the co-immobilization protocols (ii) and (iii) (30.7 mM and 29.1 mM, respectively). The reusability study showed that the best combination was [DAAO + CAT][TK], which led to the same level of L-erythrulose formation after two reuse cycles. The described process paves the way for the effective synthesis of a wide range of α-hydroxyketones from D-serine and suitable aldehydes. Full article

(This article belongs to the Special Issue Modern Catalytic Reactor: From Active Center to Application Tests, 2nd Edition)

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