Pub Date : 2024-01-13DOI: 10.1007/s11237-024-09786-9
M. L. Ovcharov, P. I. Glukhova, A. M. Mishura, V. M. Granchak
Strontium and barium titanates with a perovskite structure have been obtained using a sol–gel method. It is shown that these materials are characterized by high values of a band gap (3.1 and 3.2 eV for SrTiO3 and BaTiO3, respectively). Morphological characteristics of the obtained titanates are considered, the presence of micrometer aggregates, consisting of nanosticks (diameter of 20-40 nm, length of 100-200 nm) and nanocrystals with size of 20-70 nm, is established. The photocatalytic properties of the samples in the process of NO2 decomposition to N2 and O2 under UV irradiation (λ = 365 nm) are studied, a possible mechanism of nitrogen dioxide conversion is discussed.
{"title":"Photocatalytic Activity of SrTiO3 and BaTiO3 Nanostructures, Formed by the Sol-Gel Method, in the Process of Nitrogen Dioxide Decomposition","authors":"M. L. Ovcharov, P. I. Glukhova, A. M. Mishura, V. M. Granchak","doi":"10.1007/s11237-024-09786-9","DOIUrl":"10.1007/s11237-024-09786-9","url":null,"abstract":"<p>Strontium and barium titanates with a perovskite structure have been obtained using a sol–gel method. It is shown that these materials are characterized by high values of a band gap (3.1 and 3.2 eV for SrTiO<sub>3</sub> and BaTiO<sub>3</sub>, respectively). Morphological characteristics of the obtained titanates are considered, the presence of micrometer aggregates, consisting of nanosticks (diameter of 20-40 nm, length of 100-200 nm) and nanocrystals with size of 20-70 nm, is established. The photocatalytic properties of the samples in the process of NO<sub>2</sub> decomposition to N<sub>2</sub> and O<sub>2</sub> under UV irradiation (λ = 365 nm) are studied, a possible mechanism of nitrogen dioxide conversion is discussed.</p>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"59 4","pages":"276 - 284"},"PeriodicalIF":0.7,"publicationDate":"2024-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139459777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-12DOI: 10.1007/s11237-024-09787-8
O. V. Shevchenko, K. V. Burenkova, S. A. Kurta
Complexation of a copolymer of styrene and 5-methyl-5-hexene-2,4-dione with cobalt chloride in dimethylformamide occurs with the formation of metallopolymers of two types, namely with intra- and extramolecular binding of β-diketone groups, the ratio of which depends on the concentration of the initial macromolecular ligand. It has been established that the polymer metal complexes differ in the geometry of the coordination unit, molecular weights, and metal content resulting in the different reactivity to initiation of graft radical polymerization of methyl methacrylate.
{"title":"Cobalt(II) Metallopolymers with 5-methyl-5-hexene-2,4-dione Immobilized on a Polystyrene Matrix as Initiators of Radical Polymerization of Metyl Methacrylate","authors":"O. V. Shevchenko, K. V. Burenkova, S. A. Kurta","doi":"10.1007/s11237-024-09787-8","DOIUrl":"10.1007/s11237-024-09787-8","url":null,"abstract":"<p>Complexation of a copolymer of styrene and 5-methyl-5-hexene-2,4-dione with cobalt chloride in dimethylformamide occurs with the formation of metallopolymers of two types, namely with intra- and extramolecular binding of β-diketone groups, the ratio of which depends on the concentration of the initial macromolecular ligand. It has been established that the polymer metal complexes differ in the geometry of the coordination unit, molecular weights, and metal content resulting in the different reactivity to initiation of graft radical polymerization of methyl methacrylate.</p>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"59 4","pages":"285 - 292"},"PeriodicalIF":0.7,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139459726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-10DOI: 10.1007/s11237-023-09775-4
V. Sh. Saberov, G. F. Rayenko, A. S. Avksentiev, L. M. Vakhitova, N. I. Korotkikh
New catalytic methods for the hydrodehalogenation of haloarenes with hydrogen and hydrogen-containing reagents (metal and non-metal hydrids, organic hydrogen-containing compounds, etc.), which are essential for fine organic synthesis and neutralization of toxic production waste and persistent organic pollutants. The paper focuses on such catalysts as complexes of stable heterocyclic carbenes, transition metals, and nanosized metal particles and their composites, as the most promising for industrial chemistry. Catalysts with particularly high efficiency have been highlighted.
{"title":"Catalytic Hydrodehalogenation of Haloarenes with Hydrogen and Hydrogen-Containing Compounds: A Review","authors":"V. Sh. Saberov, G. F. Rayenko, A. S. Avksentiev, L. M. Vakhitova, N. I. Korotkikh","doi":"10.1007/s11237-023-09775-4","DOIUrl":"10.1007/s11237-023-09775-4","url":null,"abstract":"<div><div><p>New catalytic methods for the hydrodehalogenation of haloarenes with hydrogen and hydrogen-containing reagents (metal and non-metal hydrids, organic hydrogen-containing compounds, etc.), which are essential for fine organic synthesis and neutralization of toxic production waste and persistent organic pollutants. The paper focuses on such catalysts as complexes of stable heterocyclic carbenes, transition metals, and nanosized metal particles and their composites, as the most promising for industrial chemistry. Catalysts with particularly high efficiency have been highlighted.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"59 3","pages":"151 - 177"},"PeriodicalIF":1.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134796050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-03DOI: 10.1007/s11237-023-09777-2
C. Sezgin, İ. Erden
It is shown that the derivatives of 4,5-diazafluorenone-9-hydrazone containing thiophene and aldehyde anchor groups, as well as mixed-ligand Ru(II) complexes with these dyes and bipyridine, have the properties of sensibilizers of TiO2-based photovoltaic cells. The power conversion efficiency (η) in such photovoltaic elements under simulated 100 mW/cm2 solar radiation is in the range of 0.25-0.48%. The value of η in the case of compounds, bearing thiophene-2,5-dicarbaldehyde fragment as an anchor, is almost two times higher compared to the analogues, containing non-substituted thiophene fragment.
{"title":"Photovoltaic Properties of Thiophene-Containing Derivatives of 4,5-Diazafluorene and Their Ruthenium(II) Complexes","authors":"C. Sezgin, İ. Erden","doi":"10.1007/s11237-023-09777-2","DOIUrl":"10.1007/s11237-023-09777-2","url":null,"abstract":"<div><div><p>It is shown that the derivatives of 4,5-diazafluorenone-9-hydrazone containing thiophene and aldehyde anchor groups, as well as mixed-ligand Ru(II) complexes with these dyes and bipyridine, have the properties of sensibilizers of TiO<sub>2</sub>-based photovoltaic cells. The power conversion efficiency (η) in such photovoltaic elements under simulated 100 mW/cm<sup>2</sup> solar radiation is in the range of 0.25-0.48%. The value of η in the case of compounds, bearing thiophene-2,5-dicarbaldehyde fragment as an anchor, is almost two times higher compared to the analogues, containing non-substituted thiophene fragment.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"59 3","pages":"186 - 192"},"PeriodicalIF":1.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134878251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-31DOI: 10.1007/s11237-023-09780-7
M. M. Shorokhov, V. M. Olabin, M. Klevs, G. Zageris, V. Geža, V. S. Kharitonov
The influence of carbon dioxide concentration in biogas on the composition of its reforming products has been studied to achieve optimal methanol synthesis conditions. A model of the biogas reforming stage is proposed. An optimal concentration of carbon dioxide in biogas essential for maximizing methanol production has been found. The effect of geometric characteristics of the mixing device on the homogeneity of the reacting flow, which is a critical for the process performance, has been established.
{"title":"Effect of Co2 Content on Biogas-to-Syngas Conversion for Methanol Production","authors":"M. M. Shorokhov, V. M. Olabin, M. Klevs, G. Zageris, V. Geža, V. S. Kharitonov","doi":"10.1007/s11237-023-09780-7","DOIUrl":"10.1007/s11237-023-09780-7","url":null,"abstract":"<div><div><p>The influence of carbon dioxide concentration in biogas on the composition of its reforming products has been studied to achieve optimal methanol synthesis conditions. A model of the biogas reforming stage is proposed. An optimal concentration of carbon dioxide in biogas essential for maximizing methanol production has been found. The effect of geometric characteristics of the mixing device on the homogeneity of the reacting flow, which is a critical for the process performance, has been established.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"59 3","pages":"207 - 213"},"PeriodicalIF":1.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-31DOI: 10.1007/s11237-023-09781-6
O. M. Gonchar, S. D. Nesin, Yu. V. Saveliev
A method of montmorillonite modification with polar oligourethane containing reactive amino groups has been developed. It is shown that functionalized montmorillonite is capable of adding aromatic and aliphatic diisocyanates, as well as sequential addition of aromatic diisocyanates and glycerol, which is essential for montmorillonite application as filler for polymer materials. According to wide-angle X-ray scattering, interlayer distance d001 of montmorillonite in the obtained samples varies depending on nature of oligomer macromolecules in the interlayer space that is explained with different conformation and orientation of aromatic and aliphatic oligourethane fragments.
{"title":"Functionalization of the Surface of Montmorillonite with Cationic Oligourethane Capable of Diisocyanate Addition","authors":"O. M. Gonchar, S. D. Nesin, Yu. V. Saveliev","doi":"10.1007/s11237-023-09781-6","DOIUrl":"10.1007/s11237-023-09781-6","url":null,"abstract":"<div><div><p>A method of montmorillonite modification with polar oligourethane containing reactive amino groups has been developed. It is shown that functionalized montmorillonite is capable of adding aromatic and aliphatic diisocyanates, as well as sequential addition of aromatic diisocyanates and glycerol, which is essential for montmorillonite application as filler for polymer materials. According to wide-angle X-ray scattering, interlayer distance d<sub>001</sub> of montmorillonite in the obtained samples varies depending on nature of oligomer macromolecules in the interlayer space that is explained with different conformation and orientation of aromatic and aliphatic oligourethane fragments.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"59 3","pages":"214 - 221"},"PeriodicalIF":1.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-31DOI: 10.1007/s11237-023-09782-5
D. A. Krysenko, V. Ya. Demchenko
The effect of the zeolite framework composition on the selectivity and thermodynamic parameters of ion exchange is studied for the exchange reaction of Ca2+ cations on Na-forms of clinoptilolites from nine deposits of Central and Southeast Europe, Northeast Asia, and North America. An increase in the thermodynamic affinity of Na-forms towards Ca2+ cations is shown with a decrease in the Si/Al ratio in their zeolite framework.
{"title":"Effect of the Composition of the Zeolite Framework of Natural Clinoptilolites on the Exchange of Cations Na+ On Ca2+","authors":"D. A. Krysenko, V. Ya. Demchenko","doi":"10.1007/s11237-023-09782-5","DOIUrl":"10.1007/s11237-023-09782-5","url":null,"abstract":"<div><div><p>The effect of the zeolite framework composition on the selectivity and thermodynamic parameters of ion exchange is studied for the exchange reaction of Ca<sup>2+</sup> cations on Na-forms of clinoptilolites from nine deposits of Central and Southeast Europe, Northeast Asia, and North America. An increase in the thermodynamic affinity of Na-forms towards Ca<sup>2+</sup> cations is shown with a decrease in the Si/Al ratio in their zeolite framework.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"59 3","pages":"222 - 230"},"PeriodicalIF":1.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-31DOI: 10.1007/s11237-023-09776-3
A. S. Kramar, M. L. Malysheva, V. M. Anishchenko, P. O. Kuzema, O. M. Stavinskaya, N. P. Smirnova, I. V. Laguta, R. V. Ivannikov, O. P. Linnik
The photocatalytic conversion of lignin, obtained from camelina (Camelina sativa), over titania and iron titanate films has been studied with analysis of the products using laser desorptiopn/ionization and high-performance liquid chromatography. The photocatalytic reaction over titania films leads to the formation of the mixture of compounds, such as phenol, vanillic acid, resorcinol, and p-coumaryl alcohol. In the presence of iron titanate films, the predominant reaction products are vanillic acid and p-coumaryl. The highest antioxidant activity has been revealed in the case of lignin conversion products obtained over nitrogen-containing iron titanate films under visible light exposure.
{"title":"Photocatalytic Conversion of Lignin in the Presence of Titania and Iron Titanate Films","authors":"A. S. Kramar, M. L. Malysheva, V. M. Anishchenko, P. O. Kuzema, O. M. Stavinskaya, N. P. Smirnova, I. V. Laguta, R. V. Ivannikov, O. P. Linnik","doi":"10.1007/s11237-023-09776-3","DOIUrl":"10.1007/s11237-023-09776-3","url":null,"abstract":"<div><div><p>The photocatalytic conversion of lignin, obtained from camelina (<i>Camelina sativa</i>), over titania and iron titanate films has been studied with analysis of the products using laser desorptiopn/ionization and high-performance liquid chromatography. The photocatalytic reaction over titania films leads to the formation of the mixture of compounds, such as phenol, vanillic acid, resorcinol, and <i>p</i>-coumaryl alcohol. In the presence of iron titanate films, the predominant reaction products are vanillic acid and <i>p</i>-coumaryl. The highest antioxidant activity has been revealed in the case of lignin conversion products obtained over nitrogen-containing iron titanate films under visible light exposure.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"59 3","pages":"178 - 185"},"PeriodicalIF":1.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-28DOI: 10.1007/s11237-023-09778-1
Ya. I. Kurys, I. B. Bychko, O. O. Pariiska, O. Z. Didenko, D. O. Mazur, P. E. Strizhak, V. G. Koshechko, V. D. Pokhodenko
Nitrogen-doped carbon, which is characterized by a large surface area and the presence of micro- and mesopores, has been obtained by pyrolysis of polyaniline (emeraldine base) in a reducing atmosphere. It is found that the surface layer of such material contains nitrogen in pyridinic, pyrrolic, and quaternary configurations, as well as hydroxyl and carbonyl groups. It is shown that carbonized polyaniline reveals catalytic properties in the processes of gas-phase and liquid-phase hydrogenation with molecular hydrogen of organic substrates containing C=C double bond and nitro group (ethylene, α-methylstyrene, p-nitrotoluene) are revealed.
{"title":"Carbonized Polyaniline as a Catalyst for Hydrogenation with Molecular Hydrogen of Organic Substrates with C=C Double Bond and Nitro Group","authors":"Ya. I. Kurys, I. B. Bychko, O. O. Pariiska, O. Z. Didenko, D. O. Mazur, P. E. Strizhak, V. G. Koshechko, V. D. Pokhodenko","doi":"10.1007/s11237-023-09778-1","DOIUrl":"10.1007/s11237-023-09778-1","url":null,"abstract":"<div><div><p>Nitrogen-doped carbon, which is characterized by a large surface area and the presence of micro- and mesopores, has been obtained by pyrolysis of polyaniline (emeraldine base) in a reducing atmosphere. It is found that the surface layer of such material contains nitrogen in pyridinic, pyrrolic, and quaternary configurations, as well as hydroxyl and carbonyl groups. It is shown that carbonized polyaniline reveals catalytic properties in the processes of gas-phase and liquid-phase hydrogenation with molecular hydrogen of organic substrates containing C=C double bond and nitro group (ethylene, α-methylstyrene, p-nitrotoluene) are revealed.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"59 3","pages":"193 - 199"},"PeriodicalIF":1.0,"publicationDate":"2023-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-28DOI: 10.1007/s11237-023-09779-0
G. R. Kosmambetova, N. V. Vlasenko, L. B. Kharkova, O. H. Yanko, V. M. Ogenko, V. I. Grytsenko, O. V. Shvets
It is shown that deposition of Rh-CD (CDs are carbon dots)onto SiO2, Al2O3, and ZrO2 oxide supports contributes to the appearance of the catalytic activity in the process of glycerol conversion. It is established that acrolein and acetaldehyde are oxygen-containing products in this reaction system. It is found that the yield of reaction products increases when using a support with a smaller specific surface area, which is caused by an increase in the surface concentration of acid sites.
{"title":"Catalytic Properties of Rh-Containing Carbon Dots on SiO2, Al2O3, and ZrO2 Oxide Supports in the Glycerol Conversion","authors":"G. R. Kosmambetova, N. V. Vlasenko, L. B. Kharkova, O. H. Yanko, V. M. Ogenko, V. I. Grytsenko, O. V. Shvets","doi":"10.1007/s11237-023-09779-0","DOIUrl":"10.1007/s11237-023-09779-0","url":null,"abstract":"<div><div><p>It is shown that deposition of Rh-CD (CDs are carbon dots)onto SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, and ZrO<sub>2</sub> oxide supports contributes to the appearance of the catalytic activity in the process of glycerol conversion. It is established that acrolein and acetaldehyde are oxygen-containing products in this reaction system. It is found that the yield of reaction products increases when using a support with a smaller specific surface area, which is caused by an increase in the surface concentration of acid sites.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"59 3","pages":"200 - 206"},"PeriodicalIF":1.0,"publicationDate":"2023-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}