Effect of Preparation Mode on the Properties of Mn-Na-W/SiO2 Catalysts for Oxidative Coupling of Methane: Conventional Methods vs. POSS Nanotechnology Full article
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Eurasian Chemico-Technological Journal
ISSN: 1562-3920 |
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| Output data | Year: 2016, Volume: 18, Number: 2, Pages: 93-110 Pages count : 18 DOI: 10.18321/ectj430 | ||||||||
| Tags | Mn-Na-W/ SiO2 catalysts, Oxidative coupling of methane, Preparation methods | ||||||||
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| Affiliations |
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Funding (2)
| 1 | European Commission | 262840 FP7-NMP-2010-LARGE-4 DEMCAMER |
| 2 | Federal Agency for Scientific Organizations | V.45.1.10. |
Abstract:
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.
Cite:
Ismagilov I.Z.
, Matus E.V.
, Kuznetsov V.V.
, Kerzhentsev M.A.
, Yashnik S.A.
, Larina T.V.
, Prosvirin I.P.
, Navarro R.M.
, Fierro G.J.
, Gerritsen G.
, Abbenhuis H.C.
, Ismagilov Z.R.
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. 2016.
V.18. N2. P.93-110. DOI: 10.18321/ectj430
WOS
Scopus
РИНЦ
OpenAlex
AN
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. 2016.
V.18. N2. P.93-110. DOI: 10.18321/ectj430
WOS
Scopus
РИНЦ
OpenAlex
AN
Files:
Full text from publisher
Dates:
| Submitted: | Oct 18, 2015 |
| Accepted: | Mar 12, 2016 |
| Published print: | May 25, 2016 |
| Published online: | Nov 30, 2016 |
Identifiers:
| ≡ Web of science: | WOS:000391003400002 |
| ≡ Scopus: | 2-s2.0-85019163434 |
| ≡ Elibrary: | 30020135 |
| ≡ OpenAlex: | W2579093453 |
| ≡ Chemical Abstracts: | 2018:1027253 |