21ST CENTURY: CHEMISTRY TO LIFE最新文献

{"title":"The effect of NiMo catalysts preparation method on the hydrodeoxygenation of sunflower oil","authors":"A. Nepomnyashchiy, E. A. Buluchevskiy, A. Lavrenov","doi":"10.1063/1.5122900","DOIUrl":"https://doi.org/10.1063/1.5122900","url":null,"abstract":"The possibility of obtaining diesel fuel components by refining sunflower oil on nickel-molybdenum catalysts, with varying synthetic methods and preliminary preparation conditions were considered. Ni and Mo based bimetallic catalysts prepared from mono- and bi-metallic precursors in sulfide form provide a hydrocarbons yield of 74.6-82.5 % containing predominantly fractions of n-alkanes (88-95%). The period of stable operation of the systems is at least 500 hours.The possibility of obtaining diesel fuel components by refining sunflower oil on nickel-molybdenum catalysts, with varying synthetic methods and preliminary preparation conditions were considered. Ni and Mo based bimetallic catalysts prepared from mono- and bi-metallic precursors in sulfide form provide a hydrocarbons yield of 74.6-82.5 % containing predominantly fractions of n-alkanes (88-95%). The period of stable operation of the systems is at least 500 hours.","PeriodicalId":177536,"journal":{"name":"21ST CENTURY: CHEMISTRY TO LIFE","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123747705","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}

{"title":"From mesopores to micropores: A new way to control the porous structure of carbon-carbon composites","authors":"O. N. Baklanova, O. A. Knyazheva, A. V. Vasilevich, A. V. Lavrenov","doi":"10.1063/1.5122903","DOIUrl":"https://doi.org/10.1063/1.5122903","url":null,"abstract":"A technology has been developed for modifying carbon black of industrial and special brands when conducting mechanical activation of technical conditions in an oxidizing environment. The technology of mechano-chemical synthesis of carbide-containing composite has been developed. The formulation of mechanically activated mixture, the parameters of mechano-chemical synthesis and calcination conditions were established, which provide for the production of carbide-containing composites, the molybdenum carbide phase is well crystallized and the amount of impurities is minimal.A technology has been developed for modifying carbon black of industrial and special brands when conducting mechanical activation of technical conditions in an oxidizing environment. The technology of mechano-chemical synthesis of carbide-containing composite has been developed. The formulation of mechanically activated mixture, the parameters of mechano-chemical synthesis and calcination conditions were established, which provide for the production of carbide-containing composites, the molybdenum carbide phase is well crystallized and the amount of impurities is minimal.","PeriodicalId":177536,"journal":{"name":"21ST CENTURY: CHEMISTRY TO LIFE","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122326524","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}

{"title":"Study of the adsorption properties of molded carbon sorbents in relation to organic dyes in model conditions","authors":"L. P’yanova, N. Kornienko, V. A. Suprunyuk","doi":"10.1063/1.5122905","DOIUrl":"https://doi.org/10.1063/1.5122905","url":null,"abstract":"The initial and modified carbon sorbent modified with biologically active polymer - polyvinylpyrrolidone was obtained. Their physical and chemical properties are investigated. The influence of the process of modifying a molded carbon sorbent on its physicochemical properties is shown. The adsorption properties of molded carbon sorbents with respect to marker substances of various nature (organic dyes) under model conditions are studied. The regularities of the effect of the porous structure and the functional composition of the surface of molded carbon sorbents on the adsorption of methylene blue and methanil yellow dyes are established.The initial and modified carbon sorbent modified with biologically active polymer - polyvinylpyrrolidone was obtained. Their physical and chemical properties are investigated. The influence of the process of modifying a molded carbon sorbent on its physicochemical properties is shown. The adsorption properties of molded carbon sorbents with respect to marker substances of various nature (organic dyes) under model conditions are studied. The regularities of the effect of the porous structure and the functional composition of the surface of molded carbon sorbents on the adsorption of methylene blue and methanil yellow dyes are established.","PeriodicalId":177536,"journal":{"name":"21ST CENTURY: CHEMISTRY TO LIFE","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122786126","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}

{"title":"Electron paramagnetic resonance spectroscopy study of nanoglobular carbon black before and after the irradiation with high-energy electron beam","authors":"V. Yurpalov, V. Drozdov, M. Trenikhin","doi":"10.1063/1.5122913","DOIUrl":"https://doi.org/10.1063/1.5122913","url":null,"abstract":"The structural changes taking place in high (P-267E) and low (T-900) dispersion carbon blacks under the high energy electron beam irradiation were investigated by EPR spectroscopy. All types of defective paramagnetic structures formed during the irradiation process of the carbon materials were identified. For both samples formation of new paramagnetic defects is occurred, which are due to the decrease of particles size, conjugation (delocalization) of electrons and the length of graphene layers in general.","PeriodicalId":177536,"journal":{"name":"21ST CENTURY: CHEMISTRY TO LIFE","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129762604","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}

{"title":"Study characteristics of the porous carbon material Sibunit™ trademark for the production of medical sorbents","authors":"V. A. Likholobov, L. S. Luzyanina","doi":"10.1063/1.5122944","DOIUrl":"https://doi.org/10.1063/1.5122944","url":null,"abstract":"Physicochemical characteristics of porous carbon material of Sibunit™ trademark, which are formed during its synthesis, were studied, and their compliance with the requirements of medical standards was evaluated. It was established that the chemical purity of the material (mass fraction of carbon), the minimum content of impurities (sulfur, ash), bulk density, specific surface area of SBET, strength granules (resistance to abrasion granules) meet these requirements, determining the prospects of its use as a basis for the creation of medical sorbents. However, the alkaline nature of the surface, the presence of a significant amount of ultrafine carbon particles (carbon dust), generated during the material synthesis process, exclude the possibility of such an application before solving the problem of bringing these characteristics to the required standards. The well-known methods of bringing the characteristics of carbon sorbents that do not meet the requirements of medical standards to accepted values are given.Physicochemical characteristics of porous carbon material of Sibunit™ trademark, which are formed during its synthesis, were studied, and their compliance with the requirements of medical standards was evaluated. It was established that the chemical purity of the material (mass fraction of carbon), the minimum content of impurities (sulfur, ash), bulk density, specific surface area of SBET, strength granules (resistance to abrasion granules) meet these requirements, determining the prospects of its use as a basis for the creation of medical sorbents. However, the alkaline nature of the surface, the presence of a significant amount of ultrafine carbon particles (carbon dust), generated during the material synthesis process, exclude the possibility of such an application before solving the problem of bringing these characteristics to the required standards. The well-known methods of bringing the characteristics of carbon sorbents that do not meet the requirements of medical standards to accepted values are ...","PeriodicalId":177536,"journal":{"name":"21ST CENTURY: CHEMISTRY TO LIFE","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128438455","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}

{"title":"Electrochemical studies of modified carbon black in supercapacitors","authors":"A. N. Voropay, Y. Surovikin, I. Rezanov","doi":"10.1063/1.5122947","DOIUrl":"https://doi.org/10.1063/1.5122947","url":null,"abstract":"The development of energy storage systems, in particular, supercapacitors, is associated with the development of new materials and technologies for their processing. In the modern world, the production of supercapacitors, as a promising class of pulsed energy storage devices, is actively developing in communication, with the expansion of their applications ranging from portable electronics and the Internet of things to application in «MicroGrid» and alternative energy. Therefore, work on the manufacture and study of new carbon materials for SC electrodes is an important task. In this work, comparative electrochemical studies of carbon-carbon nanocomposites based on carbon black with a commercial sample of active carbon used in the manufacture of SC were carried out. It has been established that experimental samples of nanocomposites with increased current loads have higher performance characteristics: specific capacity and stability during cycling.The development of energy storage systems, in particular, supercapacitors, is associated with the development of new materials and technologies for their processing. In the modern world, the production of supercapacitors, as a promising class of pulsed energy storage devices, is actively developing in communication, with the expansion of their applications ranging from portable electronics and the Internet of things to application in «MicroGrid» and alternative energy. Therefore, work on the manufacture and study of new carbon materials for SC electrodes is an important task. In this work, comparative electrochemical studies of carbon-carbon nanocomposites based on carbon black with a commercial sample of active carbon used in the manufacture of SC were carried out. It has been established that experimental samples of nanocomposites with increased current loads have higher performance characteristics: specific capacity and stability during cycling.","PeriodicalId":177536,"journal":{"name":"21ST CENTURY: CHEMISTRY TO LIFE","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128970622","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}

{"title":"The effect of FeCrAl spiral temperature on the interaction of methane and its pyrolysis products with ethane","authors":"S. S. Sigaeva, E. Anoshkina, V. Temerev, A. R. Osipov, D. A. Shlyapin","doi":"10.1063/1.5122942","DOIUrl":"https://doi.org/10.1063/1.5122942","url":null,"abstract":"The combined transformation of methane, its pyrolysis products and ethane in the two-section T-shaped reactor are investigated. In the first section of the reactor (the supply tube) the FeCrAl alloy spiral catalyst, which is heated by electric current, is located. A cold gas mixture consisting of methane and nitrogen was fed to a spiral heated to 800-1100 °C. Then the reaction gas got into the second section of the reactor and mixed with the flow of the ethane and nitrogen mixture. It was shown that there are principal possibility of C3 and C4 hydrocarbons receiving under these conditions. The effect of the spiral temperature on the composition of the reaction products was also investigated.","PeriodicalId":177536,"journal":{"name":"21ST CENTURY: CHEMISTRY TO LIFE","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123947785","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}

{"title":"The region of hydroisomerization reactions of n-heptane and a benzene/n-heptane mixture over Pt-containing catalysts based on BEA and MOR zeolites","authors":"E. A. Belopukhov, I. M. Kalashnikov, D. I. Kir’yanov, M. Smolikov, A. Belyi","doi":"10.1063/1.5122924","DOIUrl":"https://doi.org/10.1063/1.5122924","url":null,"abstract":"The region of hydroisomerization reactions of n-heptane and its mixture with benzene over Pt-containing catalysts based on BEA and MOR zeolites was studied. The conditions of isomerization reactions of n-heptane and a n-heptane/benzene mixture were found to prevent the effect of internal/external diffusion on the catalytic performance of the indicated reactions.","PeriodicalId":177536,"journal":{"name":"21ST CENTURY: CHEMISTRY TO LIFE","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121086122","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}

{"title":"Non-oxidative activation of methane under a pulsed mode in the presence of supported platinum-containing catalysts","authors":"V. Pashkov, D. Golinsky, N. Vinichenko, A. Belyi","doi":"10.1063/1.5122940","DOIUrl":"https://doi.org/10.1063/1.5122940","url":null,"abstract":"The novelty of the research was that the transformations were carried out in a pulsed mode at small contact times. A rise in temperature increases the amount of activated methane but decreases the H/C ratio in the surface hydrocarbon fragments. The optimal contact time of methane with the catalyst is in the range from 1 to 2.5 s. It provides the required methane activation depth and, which is most important, the optimal H/C ratio in the surface hydrocarbon fragments CHx equal to 3 at./at. An increase in the amount of strong LAS (a.b. at 2200 cm−1 and higher) in the support enhances methane activation at a considerable decrease in the H/C ratio in the surface hydrocarbon fragments, whereas a substantial increase (in the case of Pt/Al2O3−F, up to 150 μmol/g) deteriorates the activity toward methane activation and the H/C ratio.The novelty of the research was that the transformations were carried out in a pulsed mode at small contact times. A rise in temperature increases the amount of activated methane but decreases the H/C ratio in the surface hydrocarbon fragments. The optimal contact time of methane with the catalyst is in the range from 1 to 2.5 s. It provides the required methane activation depth and, which is most important, the optimal H/C ratio in the surface hydrocarbon fragments CHx equal to 3 at./at. An increase in the amount of strong LAS (a.b. at 2200 cm−1 and higher) in the support enhances methane activation at a considerable decrease in the H/C ratio in the surface hydrocarbon fragments, whereas a substantial increase (in the case of Pt/Al2O3−F, up to 150 μmol/g) deteriorates the activity toward methane activation and the H/C ratio.","PeriodicalId":177536,"journal":{"name":"21ST CENTURY: CHEMISTRY TO LIFE","volume":"319 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116541234","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}

{"title":"Mechanochemistry of carbon: Surface functionalization and formation of carbides","authors":"O. N. Baklanova, O. A. Knyazheva, A. V. Vasilevich, A. V. Lavrenov","doi":"10.1063/1.5122945","DOIUrl":"https://doi.org/10.1063/1.5122945","url":null,"abstract":"A technology has been developed for producing porous carbon materials in the form of granules with a diameter of 0.5–0.8 mm with a micro-mesoporous texture. An aqueous solution of furfuryl alcohol was used as a dispersion medium, followed by heat treatment in inert, hydrocarbon and oxidizing atmosphere for the development of a microporous texture at the granule formation stage using the granulation and extrusion methods of carbon black. A technology has been developed for modifying the texture of a mesoporous carbon material in the form of honeycomb blocks, which ensures the production of a carbon sorbent with a uniformly microporous texture. The technology consists of the impregnation of mesoporous Sibunit by furfuryl alcohol solutions in water, followed by polymerization and carbonization of the applied layer. Polymerization of FA and carbonization occur in the largest pores of the carbon matrix (30-50 nm), which act as nanoreactors. This leads to the formation of a uniform microporous structure with a pore size of 3-5 nm. It is shown, a modified Sibunit with a homogeneous microporous texture has molecular sieve properties in separating a mixture of gases CO2 + CH4.A technology has been developed for producing porous carbon materials in the form of granules with a diameter of 0.5–0.8 mm with a micro-mesoporous texture. An aqueous solution of furfuryl alcohol was used as a dispersion medium, followed by heat treatment in inert, hydrocarbon and oxidizing atmosphere for the development of a microporous texture at the granule formation stage using the granulation and extrusion methods of carbon black. A technology has been developed for modifying the texture of a mesoporous carbon material in the form of honeycomb blocks, which ensures the production of a carbon sorbent with a uniformly microporous texture. The technology consists of the impregnation of mesoporous Sibunit by furfuryl alcohol solutions in water, followed by polymerization and carbonization of the applied layer. Polymerization of FA and carbonization occur in the largest pores of the carbon matrix (30-50 nm), which act as nanoreactors. This leads to the formation of a uniform microporous structure with a ...","PeriodicalId":177536,"journal":{"name":"21ST CENTURY: CHEMISTRY TO LIFE","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124762646","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}