Preparation of synthetic magnetite (Fe3O4) is particularly by precipitation methods due to the necessary preservation of both oxidation states of iron. The procedure here presented starts from dropping a NaOH/hydrate hydrazine solution into a Teflon® reaction vessel containing a solution of FeCl2·4H2O in distilled water under nitrogen atmosphere. The reaction mixture was inserted in a continuous microwave synthesis reactor at 100°C and 10 bar with a flow rate of ca. 45 mL/min. The XRD mineralogical and TEM morphological analyses were performed to identify the magnetite phase and the nanoparticle size distribution. Sample magnetic properties are measured with a SQUID-magnetometer. The results were compared with those obtained in microwave irradiated batch reactors. The synthetic magnetite probes were tested as catalysts in microwave-assisted oxidative dehydrogenation of ethyl benzene to styrene.
Continuous flow microwave method for magnetite nanoparticles production / Rizzuti, A.; Bondioli, F.; Corradi, A.; Leonelli, C.; Ondruschka, B.; Scholz, P.; Buchholz, A.; Plass, W.. - (2009), pp. 184-187. (Intervento presentato al convegno 12th International Conference on Microwave and High Frequency Heating, AMPERE 2009 tenutosi a Forschungszentrum Karlsruhe, Fortbildungszentrum fur Technik und Umwelt (FTU), deu nel 2009).
Continuous flow microwave method for magnetite nanoparticles production
Rizzuti A.;Bondioli F.;Leonelli C.;
2009
Abstract
Preparation of synthetic magnetite (Fe3O4) is particularly by precipitation methods due to the necessary preservation of both oxidation states of iron. The procedure here presented starts from dropping a NaOH/hydrate hydrazine solution into a Teflon® reaction vessel containing a solution of FeCl2·4H2O in distilled water under nitrogen atmosphere. The reaction mixture was inserted in a continuous microwave synthesis reactor at 100°C and 10 bar with a flow rate of ca. 45 mL/min. The XRD mineralogical and TEM morphological analyses were performed to identify the magnetite phase and the nanoparticle size distribution. Sample magnetic properties are measured with a SQUID-magnetometer. The results were compared with those obtained in microwave irradiated batch reactors. The synthetic magnetite probes were tested as catalysts in microwave-assisted oxidative dehydrogenation of ethyl benzene to styrene.
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