E. H. Ismailov, D. B. Taghiyev, S. M. Zulfugarova, S. N. Osmanova, G. R. Azimova, J. W. Thybaut
{"title":"MnNaW/SiO2氧化体系在甲烷氧化转化中的相组成及催化性能","authors":"E. H. Ismailov, D. B. Taghiyev, S. M. Zulfugarova, S. N. Osmanova, G. R. Azimova, J. W. Thybaut","doi":"10.1007/s11237-022-09723-8","DOIUrl":null,"url":null,"abstract":"<div><div><p>MnNaW/SiO<sub>2</sub> oxide system based on a mesoporous silica matrix synthesized using tetraethoxysilane and cetyltrimethylammonium bromide as precursors were prepared and characterized by SEM/EDS, XRD, EPR, N<sub>2</sub> adsorption-desorption measurements and studied in the oxidative conversion of methane (OCM). It is shown that MnNaW/SiO<sub>2</sub> catalyst consists of MnO<sub>x</sub>, Na<sub>2</sub>WO<sub>4</sub>, MnWO<sub>4</sub>, and SiO<sub>2</sub> phases. At the reaction temperature of 750-850°C the molten Na<sub>2</sub>WO<sub>4</sub> phase covers the surface of crystalline SiO<sub>2</sub>, and the interaction of MnO<sub>x</sub>, Na<sub>2</sub>WO<sub>4</sub> and SiO<sub>2</sub> matrix forms “liquid glass”. It is assumed that Na<sub>1–y</sub>MnO<sub>x</sub> particles formed as a result of the interaction of the system components during catalyst formation and characterized by the presence of ion-radical lattice oxygen are catalytically active sites in the OCM process.</p></div></div>","PeriodicalId":796,"journal":{"name":"Theoretical and Experimental Chemistry","volume":"58 1","pages":"61 - 69"},"PeriodicalIF":0.7000,"publicationDate":"2022-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Phase Composition and Catalytic Properties of MnNaW/SiO2 Oxide System in Oxidative Conversion of Methane\",\"authors\":\"E. H. Ismailov, D. B. Taghiyev, S. M. Zulfugarova, S. N. Osmanova, G. R. Azimova, J. W. Thybaut\",\"doi\":\"10.1007/s11237-022-09723-8\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div><p>MnNaW/SiO<sub>2</sub> oxide system based on a mesoporous silica matrix synthesized using tetraethoxysilane and cetyltrimethylammonium bromide as precursors were prepared and characterized by SEM/EDS, XRD, EPR, N<sub>2</sub> adsorption-desorption measurements and studied in the oxidative conversion of methane (OCM). It is shown that MnNaW/SiO<sub>2</sub> catalyst consists of MnO<sub>x</sub>, Na<sub>2</sub>WO<sub>4</sub>, MnWO<sub>4</sub>, and SiO<sub>2</sub> phases. At the reaction temperature of 750-850°C the molten Na<sub>2</sub>WO<sub>4</sub> phase covers the surface of crystalline SiO<sub>2</sub>, and the interaction of MnO<sub>x</sub>, Na<sub>2</sub>WO<sub>4</sub> and SiO<sub>2</sub> matrix forms “liquid glass”. It is assumed that Na<sub>1–y</sub>MnO<sub>x</sub> particles formed as a result of the interaction of the system components during catalyst formation and characterized by the presence of ion-radical lattice oxygen are catalytically active sites in the OCM process.</p></div></div>\",\"PeriodicalId\":796,\"journal\":{\"name\":\"Theoretical and Experimental Chemistry\",\"volume\":\"58 1\",\"pages\":\"61 - 69\"},\"PeriodicalIF\":0.7000,\"publicationDate\":\"2022-06-02\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Theoretical and Experimental Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s11237-022-09723-8\",\"RegionNum\":4,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Theoretical and Experimental Chemistry","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s11237-022-09723-8","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Phase Composition and Catalytic Properties of MnNaW/SiO2 Oxide System in Oxidative Conversion of Methane
MnNaW/SiO2 oxide system based on a mesoporous silica matrix synthesized using tetraethoxysilane and cetyltrimethylammonium bromide as precursors were prepared and characterized by SEM/EDS, XRD, EPR, N2 adsorption-desorption measurements and studied in the oxidative conversion of methane (OCM). It is shown that MnNaW/SiO2 catalyst consists of MnOx, Na2WO4, MnWO4, and SiO2 phases. At the reaction temperature of 750-850°C the molten Na2WO4 phase covers the surface of crystalline SiO2, and the interaction of MnOx, Na2WO4 and SiO2 matrix forms “liquid glass”. It is assumed that Na1–yMnOx particles formed as a result of the interaction of the system components during catalyst formation and characterized by the presence of ion-radical lattice oxygen are catalytically active sites in the OCM process.
期刊介绍：
Theoretical and Experimental Chemistry is a journal for the rapid publication of research communications and reviews on modern problems of physical chemistry such as:
a) physicochemical bases, principles, and methods for creation of novel processes, compounds, and materials;
b) physicochemical principles of chemical process control, influence of external physical forces on chemical reactions;
c) physical nanochemistry, nanostructures and nanomaterials, functional nanomaterials, size-dependent properties of materials.
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