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Nanodispersed VOx/SiO2 Catalysts of Partial Oxidation of Paraffin Hydrocarbons 纳米分散VOx/SiO2催化剂对石蜡烃部分氧化的影响
IF 1 4区 化学
Theoretical and Experimental Chemistry Pub Date : 2022-12-14 DOI: 10.1007/s11237-022-09743-4
V. O. Zazhigalov, S. B. Grinenko, I. V. Bacherikova, O. A. Diyuk
{"title":"Nanodispersed VOx/SiO2 Catalysts of Partial Oxidation of Paraffin Hydrocarbons","authors":"V. O. Zazhigalov,&nbsp;S. B. Grinenko,&nbsp;I. V. Bacherikova,&nbsp;O. A. Diyuk","doi":"10.1007/s11237-022-09743-4","DOIUrl":"10.1007/s11237-022-09743-4","url":null,"abstract":"<div><div><p>VO<sub>x</sub>/SiO<sub>2</sub> with different V/Si atomic ratios have been synthesized by hydrothermal method from alkoxides of vanadium and silicon compounds. The prepared samples are characterized by high specific surface area (300-700 m<sup>2</sup>/g), uniform nanodispersed distribution of vanadia in silica matrix, the absence of crystalline phases, and the absence of the band typical for V=O bond in the Raman spectra. High activity and selectivity of the synthesized catalysts in oxidation of methane to formaldehyde, oxy-dehydrogenation of propane and n-butane have been established.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"58 4","pages":"261 - 268"},"PeriodicalIF":1.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4566503","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}
引用次数: 0
Superacid L-Sites on the Surface of Ternary ZrO2-SiO2-Al2O3 and ZrO2-SiO2-SnO2 Oxides ZrO2-SiO2-Al2O3和ZrO2-SiO2-SnO2三元氧化物表面的超酸性l -位
IF 1 4区 化学
Theoretical and Experimental Chemistry Pub Date : 2022-12-14 DOI: 10.1007/s11237-022-09744-3
O. I. Inshyna, S. V. Prudius, V. V. Brei
{"title":"Superacid L-Sites on the Surface of Ternary ZrO2-SiO2-Al2O3 and ZrO2-SiO2-SnO2 Oxides","authors":"O. I. Inshyna,&nbsp;S. V. Prudius,&nbsp;V. V. Brei","doi":"10.1007/s11237-022-09744-3","DOIUrl":"10.1007/s11237-022-09744-3","url":null,"abstract":"<div><div><p>Superacid (H<sub>0</sub> ≥ –14.52) ternary Zr<sub>35</sub>Si<sub>53</sub>Al<sub>12</sub> and Zr<sub>21</sub>Si<sub>67</sub>Sn<sub>11</sub> oxides have been studied by X-ray photoelectron spectroscopy. The high-energy shifts of Zr3d levels indicate the electron density shift from zirconium to silicon atoms, which is facilitated by the presence of tetrahedrally coordinated Al<sup>3+</sup> and Sn<sup>4+</sup> ions in Zr<sup>4+</sup> environment. Models of the superacid L-sites that include coordinatively unsaturated zirconium ions are proposed.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"58 4","pages":"269 - 275"},"PeriodicalIF":1.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4564714","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}
引用次数: 1
2D Metal Carbides as Components of Photocatalytic Systems for Hydrogen Production: A Review 二维金属碳化物光催化制氢系统的研究进展
IF 1 4区 化学
Theoretical and Experimental Chemistry Pub Date : 2022-10-12 DOI: 10.1007/s11237-022-09733-6
S. Ya. Kuchmiy, V. V. Shvalagin
{"title":"2D Metal Carbides as Components of Photocatalytic Systems for Hydrogen Production: A Review","authors":"S. Ya. Kuchmiy,&nbsp;V. V. Shvalagin","doi":"10.1007/s11237-022-09733-6","DOIUrl":"10.1007/s11237-022-09733-6","url":null,"abstract":"<div><div><p>The current state of research on photocatalytic systems for hydrogen production by metal carbides is considered. Approaches for obtaining of known and latest two-dimensional metal carbides (MXenes) and their composites with the participation of photoactive semiconductors or organic dyes are described. Properties of these materials such as photocatalysts, and precursors used in their obtaining or co-catalysts used in hydrogen production systems where metal carbides act as acceptors and carriers of photogenerated charges or catalysts of the hydrogen evolution reaction are analyzed. The most promising areas of further research are outlined.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"58 3","pages":"151 - 180"},"PeriodicalIF":1.0,"publicationDate":"2022-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4512263","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}
引用次数: 0
Localization of Hydrophobized Coumarin and Xanthene Acid–Base Indicators in Micelles 疏水性香豆素和杂蒽酸碱指示剂在胶束中的定位
IF 1 4区 化学
Theoretical and Experimental Chemistry Pub Date : 2022-10-08 DOI: 10.1007/s11237-022-09734-5
V. S. Farafonov, A. V. Lebed, N. O. Mchedlov-Petrossyan
{"title":"Localization of Hydrophobized Coumarin and Xanthene Acid–Base Indicators in Micelles","authors":"V. S. Farafonov,&nbsp;A. V. Lebed,&nbsp;N. O. Mchedlov-Petrossyan","doi":"10.1007/s11237-022-09734-5","DOIUrl":"10.1007/s11237-022-09734-5","url":null,"abstract":"<div><div><p>Specific features of the localization of coumarin and xanthene dye molecules in ionic surfactant micelles of sodium n-dodecyl sulphate and cetyltrimethylammonium bromide have been studied by molecular dynamics simulation. It is shown that the change in the microenvironment of a dye molecule in a micelle after its protonation (deprotonation) depends on both the nature of such a dye and the sign of the micelle charge. It was established that the presence of a long hydrocarbon chain in a dye molecule does not prevent its movement during (de)protonation.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"58 3","pages":"181 - 189"},"PeriodicalIF":1.0,"publicationDate":"2022-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4359695","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}
引用次数: 3
Photocatalytic Evolution of Hydrogen from Alcohol–Aqueous Solutions using Nanocrystalline Carbon Nitride Modified with Magnesium Chloride Under the Visible Light Irradiation 用氯化镁修饰的纳米晶氮化碳在可见光下催化醇水溶液中析氢
IF 1 4区 化学
Theoretical and Experimental Chemistry Pub Date : 2022-10-08 DOI: 10.1007/s11237-022-09736-3
G. Ya. Grodzyuk, K. V. Koryakina, V. V. Shvalagin, G. V. Korzhak, S. Ya. Kuchmiy
{"title":"Photocatalytic Evolution of Hydrogen from Alcohol–Aqueous Solutions using Nanocrystalline Carbon Nitride Modified with Magnesium Chloride Under the Visible Light Irradiation","authors":"G. Ya. Grodzyuk,&nbsp;K. V. Koryakina,&nbsp;V. V. Shvalagin,&nbsp;G. V. Korzhak,&nbsp;S. Ya. Kuchmiy","doi":"10.1007/s11237-022-09736-3","DOIUrl":"10.1007/s11237-022-09736-3","url":null,"abstract":"<div><div><p>Samples of nanocrystalline graphite-like carbon nitride (CGCN) modified with magnesium chloride have been obtained. The synthesized Mg-CGCN samples have been characterized by UV and IR spectroscopies, X-ray diffraction, energy dispersive X-ray analysis, and scanning electron microscopy. It is found that Mg-CGCN exhibits 60% higher photocatalytic activity in the reaction of hydrogen evolution from aqueous ethanol solutions under visible light than undoped CGCN. This may be related to a change in electrophysical characteristics (potentials of allowed bands) resulting from the incorporation of Mg<sup>2+</sup> ions into the CGCN structure, improved dissociation of photogenerated charges, and inhibition of their recombination.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"58 3","pages":"198 - 204"},"PeriodicalIF":1.0,"publicationDate":"2022-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4360622","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}
引用次数: 0
Homo- and Heteronuclear Cobalt(III)-Based Complexes with 2-Methoxy-6-[(Methylimino)Methyl]Phenol: Structure and Antioxidant Properties 2-甲氧基-6-[(甲基)甲基]苯酚的同核和异核钴基配合物:结构和抗氧化性能
IF 1 4区 化学
Theoretical and Experimental Chemistry Pub Date : 2022-10-07 DOI: 10.1007/s11237-022-09738-1
V. N. Kokozay, E. V. Polunkin, O. Yu. Vassilyeva, T. M. Kameneva, V. S. Pilyavskiy, B. W. Skelton
{"title":"Homo- and Heteronuclear Cobalt(III)-Based Complexes with 2-Methoxy-6-[(Methylimino)Methyl]Phenol: Structure and Antioxidant Properties","authors":"V. N. Kokozay,&nbsp;E. V. Polunkin,&nbsp;O. Yu. Vassilyeva,&nbsp;T. M. Kameneva,&nbsp;V. S. Pilyavskiy,&nbsp;B. W. Skelton","doi":"10.1007/s11237-022-09738-1","DOIUrl":"10.1007/s11237-022-09738-1","url":null,"abstract":"<div><div><p>CoL<sub>3</sub>·DMF, [CoCdCl<sub>2</sub>L<sub>3</sub>]·0.5H<sub>2</sub>O, and [CoMnCl<sub>2</sub>L<sub>3</sub>]·H<sub>2</sub>O complexes, where HL is a product of the condensation of o-vanillin and methylamine have been obtained. The crystal structure of the latter complex has been determined by X-ray structural analysis. The study of the antioxidant activity of these complexes in a model reaction of radical-chain oxidation of benzyl alcohol with an atmospheric oxygen has proved a significant inhibition of this process at concentrations of the complexes of 10<sup>–7</sup>-10<sup>–6</sup> mol/L. It is established that the inhibitory activity of the compounds depends on the nature of the metal ions present in the complex.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"58 3","pages":"213 - 219"},"PeriodicalIF":1.0,"publicationDate":"2022-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4322413","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}
引用次数: 1
Photocatalytic Reduction of Co2 Under Visible Light with the Participation of Binary Cu2O/Ag2O Nanoheterostructures 二元Cu2O/Ag2O纳米异质结构参与下可见光下Co2的光催化还原
IF 1 4区 化学
Theoretical and Experimental Chemistry Pub Date : 2022-10-07 DOI: 10.1007/s11237-022-09737-2
M. L. Ovcharov, A. M. Mishura, O. A. Mikhalyova, V. M. Granchak
{"title":"Photocatalytic Reduction of Co2 Under Visible Light with the Participation of Binary Cu2O/Ag2O Nanoheterostructures","authors":"M. L. Ovcharov,&nbsp;A. M. Mishura,&nbsp;O. A. Mikhalyova,&nbsp;V. M. Granchak","doi":"10.1007/s11237-022-09737-2","DOIUrl":"10.1007/s11237-022-09737-2","url":null,"abstract":"<div><div><p>Foam-like binary Cu<sub>2</sub>O/Ag<sub>2</sub>O nanoheterostructures have been obtained by an electrochemical method. Their photoelectrochemical and spectral properties have been studied. The photocatalytic properties of these composites in the process of gas-phase reduction of carbon dioxide with water vapor have been studied. The formation of binary nanoheterostructures leads to an increase in methane yield and an increase in the amount of other organic products (acetaldehyde, ethylene, and ethanol) while the system is irradiated with visible light when compared to Cu<sub>2</sub>O. This effect can be explained by the formation of a nanostructured Cu<sub>2</sub>O/Ag<sub>2</sub>O binary composite with a mutually consistent energy profile.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"58 3","pages":"205 - 212"},"PeriodicalIF":1.0,"publicationDate":"2022-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4322076","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}
引用次数: 0
Influence of Mechanochemical and Sonochemical Methods of Preparation of TiO2/ZrO2 Composites on Photocatalytic Performance in Prometrine Decomposition 机械化学和声化学制备TiO2/ZrO2复合材料对promemine分解光催化性能的影响
IF 1 4区 化学
Theoretical and Experimental Chemistry Pub Date : 2022-10-07 DOI: 10.1007/s11237-022-09735-4
O. V. Sachuk, V. A. Zazhigalov, O. V. Kiziun, N. L. Hes, A. M. Mylin, L. Yo. Kotynska, L. S. Kuznetsova, S. M. Shcherbakov, V. M. Kordan
{"title":"Influence of Mechanochemical and Sonochemical Methods of Preparation of TiO2/ZrO2 Composites on Photocatalytic Performance in Prometrine Decomposition","authors":"O. V. Sachuk,&nbsp;V. A. Zazhigalov,&nbsp;O. V. Kiziun,&nbsp;N. L. Hes,&nbsp;A. M. Mylin,&nbsp;L. Yo. Kotynska,&nbsp;L. S. Kuznetsova,&nbsp;S. M. Shcherbakov,&nbsp;V. M. Kordan","doi":"10.1007/s11237-022-09735-4","DOIUrl":"10.1007/s11237-022-09735-4","url":null,"abstract":"<div><div><p>Nanosized TiO<sub>2</sub>/ZrO<sub>2</sub>=1:1 composites have been obtained by mechanochemical, ultrasonic, and coprecipitation methods. It is shown that mechanochemical and ultrasonic treatments of a TiO<sub>2</sub> and ZrO<sub>2</sub> mixture lead to size reduction of oxide particles, changes in X-ray diffraction spectra, the formation of a mesoporous structure of TiO<sub>2</sub>/ZrO<sub>2</sub> samples, and an increase in their photocatalytic activity in the reaction of Gesagard (prometryn) herbicide destruction in an aqueous medium when compared to a mechanical TiO<sub>2</sub> and ZrO<sub>2</sub> mixture. It is found that the sample obtained by coprecipitation is X-ray amorphous with a well-developed surface, however, it is significantly inferior to samples obtained by alternative methods in terms of photoactivity.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"58 3","pages":"190 - 197"},"PeriodicalIF":1.0,"publicationDate":"2022-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4322106","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}
引用次数: 0
Polaron States of 3,4-Ethylenedioxythiophene Oligomers 3,4-乙烯二氧噻吩低聚物的极化子态
IF 1 4区 化学
Theoretical and Experimental Chemistry Pub Date : 2022-08-25 DOI: 10.1007/s11237-022-09727-4
M. I. Terebinska, O. V. Filonenko, O. I. Tkachuk, A. M. Datsyuk, V. V. Lobanov
{"title":"Polaron States of 3,4-Ethylenedioxythiophene Oligomers","authors":"M. I. Terebinska,&nbsp;O. V. Filonenko,&nbsp;O. I. Tkachuk,&nbsp;A. M. Datsyuk,&nbsp;V. V. Lobanov","doi":"10.1007/s11237-022-09727-4","DOIUrl":"10.1007/s11237-022-09727-4","url":null,"abstract":"<div><div><p>The electronic and spatial structure of 3,4-ethylenedioxythiophene oligomer containing 12 units (E12) in 0, +1, +2, +3, and +4 charge states has been calculated by the method of density functional theory (B3LYP 6-31 G**). It is shown that electron conductivity in the oxidized oligomer E12<sup>4+</sup> is provided by two bipolarons at the ends of the chain.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"58 2","pages":"105 - 108"},"PeriodicalIF":1.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4958615","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}
引用次数: 0
Effect of Acid–Base Characteristics of Zeolite Catalysts on Oxidative Dehydrogenation of Propane with Carbon Dioxide 沸石催化剂酸碱特性对丙烷二氧化碳氧化脱氢反应的影响
IF 1 4区 化学
Theoretical and Experimental Chemistry Pub Date : 2022-08-25 DOI: 10.1007/s11237-022-09729-2
A. Yu. Kapran, S. M. Orlyk
{"title":"Effect of Acid–Base Characteristics of Zeolite Catalysts on Oxidative Dehydrogenation of Propane with Carbon Dioxide","authors":"A. Yu. Kapran,&nbsp;S. M. Orlyk","doi":"10.1007/s11237-022-09729-2","DOIUrl":"10.1007/s11237-022-09729-2","url":null,"abstract":"<div><div><p>The peculiarities of propane dehydrogenation with carbon dioxide over zeolite catalysts of different structural types, in particular, BEA with incorporated Zn, Ga (Ta, Nb) heteroelements have been analyzed. The role of CO<sub>2</sub> as an oxidant, the effect of acid–base characteristics on propylene selectivity and yield, the stability of catalyst operation, and the routes of activation of reagents on acid–base sites of the surface are considered.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"58 2","pages":"118 - 129"},"PeriodicalIF":1.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4959302","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}
引用次数: 0
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