Effect of Preparation Mode on the Properties of Mn-Na-W/SiO2 Catalysts for Oxidative Coupling of Methane: Conventional Methods vs. POSS Nanotechnology
Using XPS, BET, XRD, TG-DTA, HRTEM-EDX, TPR and UV-Vis Diffuse Reflectance spectroscopic methods the electronic, redox and structural properties of Mn-Na-W/SiO2 catalysts prepared by the incipient wetness impregnation method and mixture slurry method were studied in detail. Since POSS nanotechnology...
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| Format: | Article |
| Language: | English |
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al-Farabi Kazakh National University
2016-05-01
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| Series: | Eurasian Chemico-Technological Journal |
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| Online Access: | http://ect-journal.kz/index.php/ectj/article/view/205 |
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| author | I. Z. Ismagilov E. V. Matus V. V. Kuznetsov M. A. Kerzhentsev S. A. Yasnik T. V. Larina I. P. Prosvirin R. M. Navarro J. L.G. Fierro G. Gerritsen H. C.L. Abbenhuis Z. R. Ismagilov |
| author_facet | I. Z. Ismagilov E. V. Matus V. V. Kuznetsov M. A. Kerzhentsev S. A. Yasnik T. V. Larina I. P. Prosvirin R. M. Navarro J. L.G. Fierro G. Gerritsen H. C.L. Abbenhuis Z. R. Ismagilov |
| author_sort | I. Z. Ismagilov |
| collection | DOAJ |
| description | Using XPS, BET, XRD, TG-DTA, HRTEM-EDX, TPR and UV-Vis Diffuse Reflectance spectroscopic methods the electronic, redox and structural properties of Mn-Na-W/SiO2 catalysts prepared by the incipient wetness impregnation method and mixture slurry method were studied in detail. Since POSS nanotechnology (POSS = polyhedral oligomeric silsesquioxanes) has attracted attention as tooling for synthesis of catalysts with novel properties and functionalities, we expanded this method for the preparation of Mn-Na-W/SiO2 catalyst. The physicochemical and catalytic properties of Mn-Na-W/SiO2 catalysts prepared by conventional methods
and POSS nanotechnology were examined comparatively. In all studied Mn-Na-W/ SiO2 catalysts both individual oxides (MnOx, WO3) and bimetal oxide phases (Na2WO4, MnWO4) are found in addition to oxide particles of high dispersion. The UV-Vis Diffuse Reflectance indicates that Na+ cations facilitates stabilization of octahedrally coordinated Mn3+Oh cations in the isolated state, while Mn3+Oh promote the disordering of W6+ cations in the supported system. The Mn-Na-W/ SiO2 prepared using metal-POSS precursors marks out presence of unglobular SiO2 particles, higher dispersion of MnOx and MnWO4 particles and more easily
reducible metal-oxide species. The catalysts prepared by incipient impregnation method and mixture slurry method have practically similar catalytic performance while the catalyst prepared by POSS nanotechnology method shows lower activity and selectivity. At 800‒850 °C the increase of C2 hydrocarbons yield from 4 to 15% and the rise of molar ratio С2Н4/C2H6 from 0.2 to 1 are observed when impregnation or mixture slurry method are used for catalyst preparation instead of POSS nanotechnology method. |
| first_indexed | 2024-12-18T06:25:51Z |
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| id | doaj.art-002c791bbf164d27bf842f155278e789 |
| institution | Directory Open Access Journal |
| issn | 1562-3920 2522-4867 |
| language | English |
| last_indexed | 2024-12-18T06:25:51Z |
| publishDate | 2016-05-01 |
| publisher | al-Farabi Kazakh National University |
| record_format | Article |
| series | Eurasian Chemico-Technological Journal |
| spelling | doaj.art-002c791bbf164d27bf842f155278e7892022-12-21T21:18:03Zengal-Farabi Kazakh National UniversityEurasian Chemico-Technological Journal1562-39202522-48672016-05-011829311010.18321/ectj430205Effect of Preparation Mode on the Properties of Mn-Na-W/SiO2 Catalysts for Oxidative Coupling of Methane: Conventional Methods vs. POSS NanotechnologyI. Z. Ismagilov0E. V. Matus1V. V. Kuznetsov2M. A. Kerzhentsev3S. A. Yasnik4T. V. Larina5I. P. Prosvirin6R. M. Navarro7J. L.G. Fierro8G. Gerritsen9H. C.L. Abbenhuis10Z. R. Ismagilov11Boreskov Institute of Catalysis SB RAS, pr. Akademika Lavrentieva, 5, 630090, Novosibirsk, RussiaBoreskov Institute of Catalysis SB RAS, pr. Akademika Lavrentieva, 5, 630090, Novosibirsk, RussiaBoreskov Institute of Catalysis SB RAS, pr. Akademika Lavrentieva, 5, 630090, Novosibirsk, RussiaBoreskov Institute of Catalysis SB RAS, pr. Akademika Lavrentieva, 5, 630090, Novosibirsk, RussiaBoreskov Institute of Catalysis SB RAS, pr. Akademika Lavrentieva, 5, 630090, Novosibirsk, RussiaBoreskov Institute of Catalysis SB RAS, pr. Akademika Lavrentieva, 5, 630090, Novosibirsk, RussiaBoreskov Institute of Catalysis SB RAS, pr. Akademika Lavrentieva, 5, 630090, Novosibirsk, RussiaInstituto de Catálisis y Petroleoquímica, CSIC, Marie Curie 2, 28049, Madrid, SpainInstituto de Catálisis y Petroleoquímica, CSIC, Marie Curie 2, 28049, Madrid, SpainHybrid Catalysis B.V., Den Dolech 2, Eindhoven 5612, AZ, the NetherlandsHybrid Catalysis B.V., Den Dolech 2, Eindhoven 5612, AZ, the NetherlandsBoreskov Institute of Catalysis SB RAS, pr. Akademika Lavrentieva, 5, 630090, Novosibirsk, Russia; Institute of Coal Chemistry and Material Science SB RAS, pr. Sovetskiy, 18, 650000, Kemerovo, RussiaUsing XPS, BET, XRD, TG-DTA, HRTEM-EDX, TPR and UV-Vis Diffuse Reflectance spectroscopic methods the electronic, redox and structural properties of Mn-Na-W/SiO2 catalysts prepared by the incipient wetness impregnation method and mixture slurry method were studied in detail. Since POSS nanotechnology (POSS = polyhedral oligomeric silsesquioxanes) has attracted attention as tooling for synthesis of catalysts with novel properties and functionalities, we expanded this method for the preparation of Mn-Na-W/SiO2 catalyst. The physicochemical and catalytic properties of Mn-Na-W/SiO2 catalysts prepared by conventional methods and POSS nanotechnology were examined comparatively. In all studied Mn-Na-W/ SiO2 catalysts both individual oxides (MnOx, WO3) and bimetal oxide phases (Na2WO4, MnWO4) are found in addition to oxide particles of high dispersion. The UV-Vis Diffuse Reflectance indicates that Na+ cations facilitates stabilization of octahedrally coordinated Mn3+Oh cations in the isolated state, while Mn3+Oh promote the disordering of W6+ cations in the supported system. The Mn-Na-W/ SiO2 prepared using metal-POSS precursors marks out presence of unglobular SiO2 particles, higher dispersion of MnOx and MnWO4 particles and more easily reducible metal-oxide species. The catalysts prepared by incipient impregnation method and mixture slurry method have practically similar catalytic performance while the catalyst prepared by POSS nanotechnology method shows lower activity and selectivity. At 800‒850 °C the increase of C2 hydrocarbons yield from 4 to 15% and the rise of molar ratio С2Н4/C2H6 from 0.2 to 1 are observed when impregnation or mixture slurry method are used for catalyst preparation instead of POSS nanotechnology method.http://ect-journal.kz/index.php/ectj/article/view/205oxidative coupling of methane Mn-Na-W/SiO2 catalysts preparation methods |
| spellingShingle | I. Z. Ismagilov E. V. Matus V. V. Kuznetsov M. A. Kerzhentsev S. A. Yasnik T. V. Larina I. P. Prosvirin R. M. Navarro J. L.G. Fierro G. Gerritsen H. C.L. Abbenhuis Z. R. Ismagilov Effect of Preparation Mode on the Properties of Mn-Na-W/SiO2 Catalysts for Oxidative Coupling of Methane: Conventional Methods vs. POSS Nanotechnology Eurasian Chemico-Technological Journal oxidative coupling of methane Mn-Na-W/SiO2 catalysts preparation methods |
| title | Effect of Preparation Mode on the Properties of Mn-Na-W/SiO2 Catalysts for Oxidative Coupling of Methane: Conventional Methods vs. POSS Nanotechnology |
| title_full | Effect of Preparation Mode on the Properties of Mn-Na-W/SiO2 Catalysts for Oxidative Coupling of Methane: Conventional Methods vs. POSS Nanotechnology |
| title_fullStr | Effect of Preparation Mode on the Properties of Mn-Na-W/SiO2 Catalysts for Oxidative Coupling of Methane: Conventional Methods vs. POSS Nanotechnology |
| title_full_unstemmed | Effect of Preparation Mode on the Properties of Mn-Na-W/SiO2 Catalysts for Oxidative Coupling of Methane: Conventional Methods vs. POSS Nanotechnology |
| title_short | Effect of Preparation Mode on the Properties of Mn-Na-W/SiO2 Catalysts for Oxidative Coupling of Methane: Conventional Methods vs. POSS Nanotechnology |
| title_sort | effect of preparation mode on the properties of mn na w sio2 catalysts for oxidative coupling of methane conventional methods vs poss nanotechnology |
| topic | oxidative coupling of methane Mn-Na-W/SiO2 catalysts preparation methods |
| url | http://ect-journal.kz/index.php/ectj/article/view/205 |
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