The stepwise proton-ligand stability constant of thiobarbituric acid (TBA) singly charged anion was determined in an aqueous solution via pH-metry and UV-spectrophotometry at ionic strength I = 0.1 (NaCl) and temperature T = 20 °C (25 °C). The values (lg æ2) obtained by these methods show satisfactory convergence, namely, 2.30 ± 0.01 (20 °C), 2.16 ± 0.01 (25 °C) and 2.37 ± 0.06 (20 °C), respectively. Additionally, the UV-spectrophotometry results have shown that TBA could exist in the two conjugate forms within pH of 1.1–9.2. Quantum chemical calculations have confirmed that the keto-form is more thermodynamically stable than the enol one. The obtained values for geometric parameters and for the effective charges on Mulliken atoms make it possible to describe the structure of this tautomer and to argue that the acid mainly functions as an Nand/or O-donor ligand during the complexation with metal ions. IR-spectroscopy data have confirmed that the investigated solid thiobarbituric acid has represented mainly by ketone tautomer.
{"title":"Examination of Structural Parameters and Acid-Base Properties of Thiobarbituric Acid","authors":"P. Alexander, M. Natália, R. S. Edward","doi":"10.17516/1998-2836-0104","DOIUrl":"https://doi.org/10.17516/1998-2836-0104","url":null,"abstract":"The stepwise proton-ligand stability constant of thiobarbituric acid (TBA) singly charged anion was determined in an aqueous solution via pH-metry and UV-spectrophotometry at ionic strength I = 0.1 (NaCl) and temperature T = 20 °C (25 °C). The values (lg æ2) obtained by these methods show satisfactory convergence, namely, 2.30 ± 0.01 (20 °C), 2.16 ± 0.01 (25 °C) and 2.37 ± 0.06 (20 °C), respectively. Additionally, the UV-spectrophotometry results have shown that TBA could exist in the two conjugate forms within pH of 1.1–9.2. Quantum chemical calculations have confirmed that the keto-form is more thermodynamically stable than the enol one. The obtained values for geometric parameters and for the effective charges on Mulliken atoms make it possible to describe the structure of this tautomer and to argue that the acid mainly functions as an Nand/or O-donor ligand during the complexation with metal ions. IR-spectroscopy data have confirmed that the investigated solid thiobarbituric acid has represented mainly by ketone tautomer.","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"11 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78813496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A mathematical algorithm for ionic equilibria modeling of dissolving weakly soluble salts in the presence of complexing agents or in an overage of an anion that form weakly soluble compounds in water solutions was developed. For numerical methods for calculation of chemical equilibria that involve ionic compounds a set of simplifications are formulated. This simplifications allows to significantly reduce the required computational operations while make it possible to preserve the functionality of numerical methods for solving such ionic equilibria. To verify the algorithm some systems that was studied experimentally were modelled. The maximum divergence between calculated and experimental data was 38%. Some general problems of switch-over from the experimental determination to the mathematical modeling of ionic equilibria and sedimentation in solution were emphasized.
{"title":"Modeling of Dissolution of Weakly Soluble Salts in the Presence of Complexing Agents","authors":"I Korobeinikov Artem, N. Sergey","doi":"10.17516/1998-2836-0079","DOIUrl":"https://doi.org/10.17516/1998-2836-0079","url":null,"abstract":"A mathematical algorithm for ionic equilibria modeling of dissolving weakly soluble salts in the presence of complexing agents or in an overage of an anion that form weakly soluble compounds in water solutions was developed. For numerical methods for calculation of chemical equilibria that involve ionic compounds a set of simplifications are formulated. This simplifications allows to significantly reduce the required computational operations while make it possible to preserve the functionality of numerical methods for solving such ionic equilibria. To verify the algorithm some systems that was studied experimentally were modelled. The maximum divergence between calculated and experimental data was 38%. Some general problems of switch-over from the experimental determination to the mathematical modeling of ionic equilibria and sedimentation in solution were emphasized.","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"21 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89419994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. Sergey, Mashines” Ub Ras, S. Kirill, M Barbin Nicolay, L Alexeeva Darya
Sergey G. Alexeev*a,b, Kirill S. Alexeeva,c, Nicolay M. Barbinb,c and Dar’ya L. Alexeevad aScience and Engineering Centre “Reliability and Safety of Large Systems and Mashines” UB RAS 54а Studencheskaya Str., Yekaterinburg, 620049, Russia bUral Institute of State Fire Service of Emercom of Russia 22 Mira Str., Yekaterinburg, 620062, Russia cUral State Agrarian University 42 Karla Libknekhta Str., Yekaterinburg, 620075, Russia dChemical Technology Institute of Ural Federal University named by the first President of Russia B.N. El’tzin 28 Mira Str., Yekaterinburg, 620062, Russia
Sergey G. Alexeev*a,b, Kirill S. alexeeeva,c, Nicolay M. Barbinb,c, Dar 'ya L. Alexeevad科学与工程中心“大型系统与机械的可靠性与安全性”，UB RAS 54 - studencheeskaya街，叶卡捷琳堡，620049，俄罗斯国家安全局国家消防研究所22 Mira街，叶卡捷琳堡，620062，俄罗斯农业大学42 Karla Libknekhta街，叶卡捷琳堡，620075，俄罗斯乌拉尔联邦大学化学技术研究所，由俄罗斯第一任总统B.N. El 'tzin命名，叶卡捷琳堡米拉街28号，620062，俄罗斯
{"title":"Prediction of Physical-Chemical and Fire Hazard Characteristics by Carbon Chain Rules 2. Carboxylic Acids","authors":"G. Sergey, Mashines” Ub Ras, S. Kirill, M Barbin Nicolay, L Alexeeva Darya","doi":"10.17516/1998-2836-0105","DOIUrl":"https://doi.org/10.17516/1998-2836-0105","url":null,"abstract":"Sergey G. Alexeev*a,b, Kirill S. Alexeeva,c, Nicolay M. Barbinb,c and Dar’ya L. Alexeevad aScience and Engineering Centre “Reliability and Safety of Large Systems and Mashines” UB RAS 54а Studencheskaya Str., Yekaterinburg, 620049, Russia bUral Institute of State Fire Service of Emercom of Russia 22 Mira Str., Yekaterinburg, 620062, Russia cUral State Agrarian University 42 Karla Libknekhta Str., Yekaterinburg, 620075, Russia dChemical Technology Institute of Ural Federal University named by the first President of Russia B.N. El’tzin 28 Mira Str., Yekaterinburg, 620062, Russia","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"22 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83316980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An aluminosilicate and a galloaluminosilicate of MFI structure are synthesized by the hydrothermal method from alkaline aluminosilicates. Structural, acidic, and catalytic properties of synthesized zeolites are investigated in the course of dehydrocyclization of lower alkanes. It is found out that aromatic hydrocarbons are formed in their highest amount when butane is converted over the galloaluminosilicate, while the lowest amount of them is resulted from the conversion of propane over the aluminosilicate. It is shown that to achieve the nigh conversion of propane and butane and the yield of desired product in the presence of the catalysts under study, the process temperature during the propane conversion should be 50 degrees higher under the same other reaction conditions.
{"title":"Production of Aromatic Hydrocarbons from C3, C4-alkanes Over Zeolite Catalysts","authors":"A. Anton, N. V. Ludmila, G. Irina, V. Alexander","doi":"10.17516/1998-2836-0114","DOIUrl":"https://doi.org/10.17516/1998-2836-0114","url":null,"abstract":"An aluminosilicate and a galloaluminosilicate of MFI structure are synthesized by the hydrothermal method from alkaline aluminosilicates. Structural, acidic, and catalytic properties of synthesized zeolites are investigated in the course of dehydrocyclization of lower alkanes. It is found out that aromatic hydrocarbons are formed in their highest amount when butane is converted over the galloaluminosilicate, while the lowest amount of them is resulted from the conversion of propane over the aluminosilicate. It is shown that to achieve the nigh conversion of propane and butane and the yield of desired product in the presence of the catalysts under study, the process temperature during the propane conversion should be 50 degrees higher under the same other reaction conditions.","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"20 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75314193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The electrochemical behavior of metallic palladium nanoparticles obtained by reducing H2PdCl4 with formaldehyde and the products of the interaction of H2PdCl4 with sodium sulfide with a different ratio of reagents in a solution of hydrochloric acid was studied by the method of cyclic voltammetry. Voltammograms of metallic and sulfide nanoparticles were obtained, and interpretation was given to the observed electrochemical processes. The initial and oxidized systems with different potential values were characterized by X-ray photoelectron spectroscopy (XPS). It is shown that palladium sulfide nanoparticles, obtained at high molar ratios of reagents (S/Pd = 3:1), are more resistant to oxidative and reducing effects than those obtained at low molar ratios (S/Pd = 1:1).
{"title":"Electrochemical Behavior of Palladium-Containing Nanoparticles on a Carbon Electrode in Hydrochloric Acid Solutions","authors":"S. Alexander, N. L. Maxim, A. Anton, L. M. Yuri","doi":"10.17516/1998-2836-0107","DOIUrl":"https://doi.org/10.17516/1998-2836-0107","url":null,"abstract":"The electrochemical behavior of metallic palladium nanoparticles obtained by reducing H2PdCl4 with formaldehyde and the products of the interaction of H2PdCl4 with sodium sulfide with a different ratio of reagents in a solution of hydrochloric acid was studied by the method of cyclic voltammetry. Voltammograms of metallic and sulfide nanoparticles were obtained, and interpretation was given to the observed electrochemical processes. The initial and oxidized systems with different potential values were characterized by X-ray photoelectron spectroscopy (XPS). It is shown that palladium sulfide nanoparticles, obtained at high molar ratios of reagents (S/Pd = 3:1), are more resistant to oxidative and reducing effects than those obtained at low molar ratios (S/Pd = 1:1).","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"75 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76534717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Thermolysis of asphaltenes from three heavy oils was carried out at a temperature of 120 °C in a current of N2 with the withdrawal of the resulting products from the reaction zone. Composition and structure analysis of thermolysis products showed, that at 120 °C petroleum afaltenes are subject to thermal destruction due to breaking of covalent bonds with the formation of gas, oils and resins, exceed 13 % by weight. It is established that the main directions of asphaltene thermal transformations during thermolysis are an increase aromaticity and decrease content of naphthenic and aliphatic carbon. The reactivity and thermal transformations intensity of asphaltene molecules depend on the number of reaction centers in them. Reaction centers represent a weak aliphatic heteroatomic C–Het and/or Het–Het bond, destabilized by electron acceptor functional groups and naphthenicaromatic structural blocks with a high content of heteroatoms. It is complex effect of destabilizing factors reduces the energy of breaking the C–Het and/or Het–Het bond and makes it possible for it to decompose at 120 °C.
{"title":"Thermal Transformations of Asphaltenes at a Temperature of 120 °C","authors":"S. Dmitry, S. Galina, K. Anatoly, G. Ras","doi":"10.17516/1998-2836-0110","DOIUrl":"https://doi.org/10.17516/1998-2836-0110","url":null,"abstract":"Thermolysis of asphaltenes from three heavy oils was carried out at a temperature of 120 °C in a current of N2 with the withdrawal of the resulting products from the reaction zone. Composition and structure analysis of thermolysis products showed, that at 120 °C petroleum afaltenes are subject to thermal destruction due to breaking of covalent bonds with the formation of gas, oils and resins, exceed 13 % by weight. It is established that the main directions of asphaltene thermal transformations during thermolysis are an increase aromaticity and decrease content of naphthenic and aliphatic carbon. The reactivity and thermal transformations intensity of asphaltene molecules depend on the number of reaction centers in them. Reaction centers represent a weak aliphatic heteroatomic C–Het and/or Het–Het bond, destabilized by electron acceptor functional groups and naphthenicaromatic structural blocks with a high content of heteroatoms. It is complex effect of destabilizing factors reduces the energy of breaking the C–Het and/or Het–Het bond and makes it possible for it to decompose at 120 °C.","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"28 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90634029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L Korobitsyna Lyudmila, N. Konstantin, V. Alexander
Physicochemical and catalytic properties of 4.0% Mo/ZSM-5 catalysts manufactured on the basis of zeolites with a hierarchical pore system are investigated. The effect of the conditions of synthesis of zeolites with an additional mesoporous structure on their textural and acidic characteristics is studied. The structure and morphology of crystals of synthesized zeolites and catalysts produced from them are determined by the methods of X-ray diffraction analysis and high-resolution scanning transmission electron microscopy. It is shown that 4.0% Mo/ZSM-5 catalysts produced from zeolites with a mesoporous structure exhibit higher activity and stability in the course of methane dehydroaromatization.
{"title":"Study of Methane Aromatization over Mo-Containing Zeolite Catalysts with a Hierarchical Pore System","authors":"L Korobitsyna Lyudmila, N. Konstantin, V. Alexander","doi":"10.17516/1998-2836-0111","DOIUrl":"https://doi.org/10.17516/1998-2836-0111","url":null,"abstract":"Physicochemical and catalytic properties of 4.0% Mo/ZSM-5 catalysts manufactured on the basis of zeolites with a hierarchical pore system are investigated. The effect of the conditions of synthesis of zeolites with an additional mesoporous structure on their textural and acidic characteristics is studied. The structure and morphology of crystals of synthesized zeolites and catalysts produced from them are determined by the methods of X-ray diffraction analysis and high-resolution scanning transmission electron microscopy. It is shown that 4.0% Mo/ZSM-5 catalysts produced from zeolites with a mesoporous structure exhibit higher activity and stability in the course of methane dehydroaromatization.","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"36 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74748634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pikurova Elena V., Saikova Svetlana V., Chityakov Dmitry I., K. Irina V., Samoilo Alexander S.
In the paper we present a method for producing hybrid organo-inorganic materials based on α-Ni(OH)2. This materials were synthesized by the anion resin exchange precipitation of nickel nitrate in the presence of sodium dodecyl sulfate or cetyltrimethylammonium bromide (CTAB) using the strong base anion exchange resin AB-17-8 in the OH-form as a precipitate agent. The as-obtained products were studied by methods X-ray diffraction, infrared spectroscopy, complex thermal analysis and TEM.
{"title":"Synthesis of Hybrid Organo-Inorganic Materials Based on α-Ni(OH)2","authors":"Pikurova Elena V., Saikova Svetlana V., Chityakov Dmitry I., K. Irina V., Samoilo Alexander S.","doi":"10.17516/1998-2836-0106","DOIUrl":"https://doi.org/10.17516/1998-2836-0106","url":null,"abstract":"In the paper we present a method for producing hybrid organo-inorganic materials based on α-Ni(OH)2. This materials were synthesized by the anion resin exchange precipitation of nickel nitrate in the presence of sodium dodecyl sulfate or cetyltrimethylammonium bromide (CTAB) using the strong base anion exchange resin AB-17-8 in the OH-form as a precipitate agent. The as-obtained products were studied by methods X-ray diffraction, infrared spectroscopy, complex thermal analysis and TEM.","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"16 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85512874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N Malyar Yuriy, I. Victor, S. Alexander, V. Alexander
Organosolv delignification of wood in the lower alcohols media is one of the promising methods for lignocellulosic biomass processing. The organosolv lignins obtained do not contain sulfur and ash, and therefore are a promising raw material for processing into valuable chemical products. To study the structure of lignins, a large range of physicochemical methods is used. In this review, attention is focused on the methods of studying the structure and properties of organosolv lignins, which have recently been greatly developed – gel permeation chromatography and thermal analysis methods. Examples of the use of these methods to study the molecular mass characteristics of organosolv lignins and their thermochemical properties are considered.
{"title":"Study of Organosolv Lignins Using Gel Permeation Chromatography and Thermal Analysis","authors":"N Malyar Yuriy, I. Victor, S. Alexander, V. Alexander","doi":"10.17516/1998-2836-0109","DOIUrl":"https://doi.org/10.17516/1998-2836-0109","url":null,"abstract":"Organosolv delignification of wood in the lower alcohols media is one of the promising methods for lignocellulosic biomass processing. The organosolv lignins obtained do not contain sulfur and ash, and therefore are a promising raw material for processing into valuable chemical products. To study the structure of lignins, a large range of physicochemical methods is used. In this review, attention is focused on the methods of studying the structure and properties of organosolv lignins, which have recently been greatly developed – gel permeation chromatography and thermal analysis methods. Examples of the use of these methods to study the molecular mass characteristics of organosolv lignins and their thermochemical properties are considered.","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"23 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81740749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Vladimir, P. Nadezhda, N. Nina, V. Yuriy, M. Z. Anatoly, A. Leonid
In this paper, α-Fe2O3–CaFe2O4 composite materials obtained by high-temperature solid-phase synthesis from Ca and Fe (III) oxides with varying molar ratio CaO/Fe2O3 in the range 0.15-1.00 were investigated. The materials are characterized by Х-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray microanalysis (SEM-EDS) and simultaneous thermal analysis (STA) in the hydrogen temperature-programmed reduction mode (H2-TPR). SEM-EDS studies of the specimens were revealed a formation of the “core-shell” type complex microstructure of material with the hematite phase as the “core”. H2-TPR of the specimens allowed to establish a decrease of the contribution of low-temperature forms of lattice oxygen in areas of 350-510 °С (up to 2.6 times) and 510-650 °С (up to 1.7 times), and the growth of the contribution of the high-temperature oxygen form in the range of 650-900 °С (up to 2 times) with an increase in the content of the phase CaFe2O4 from 33.4 to 97.5 wt. %. Relying on the assessment of lattice oxygen mobility, it was suggested, that the samples with content of CaFe2O4 phase more than 55.4 wt. % are promising for use as oxygen carriers in chemical looping processes of syngas production.
{"title":"Composition, Structure and Reduction Reactivity of Composite Materials of the α-Fe2O3–СaFe2O4 System by Hydrogen","authors":"V. Vladimir, P. Nadezhda, N. Nina, V. Yuriy, M. Z. Anatoly, A. Leonid","doi":"10.17516/1998-2836-0108","DOIUrl":"https://doi.org/10.17516/1998-2836-0108","url":null,"abstract":"In this paper, α-Fe2O3–CaFe2O4 composite materials obtained by high-temperature solid-phase synthesis from Ca and Fe (III) oxides with varying molar ratio CaO/Fe2O3 in the range 0.15-1.00 were investigated. The materials are characterized by Х-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray microanalysis (SEM-EDS) and simultaneous thermal analysis (STA) in the hydrogen temperature-programmed reduction mode (H2-TPR). SEM-EDS studies of the specimens were revealed a formation of the “core-shell” type complex microstructure of material with the hematite phase as the “core”. H2-TPR of the specimens allowed to establish a decrease of the contribution of low-temperature forms of lattice oxygen in areas of 350-510 °С (up to 2.6 times) and 510-650 °С (up to 1.7 times), and the growth of the contribution of the high-temperature oxygen form in the range of 650-900 °С (up to 2 times) with an increase in the content of the phase CaFe2O4 from 33.4 to 97.5 wt. %. Relying on the assessment of lattice oxygen mobility, it was suggested, that the samples with content of CaFe2O4 phase more than 55.4 wt. % are promising for use as oxygen carriers in chemical looping processes of syngas production.","PeriodicalId":16999,"journal":{"name":"Journal of Siberian Federal University. Chemistry","volume":"93 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78053470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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