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. ( 12th International Conference on Microwave and High Frequency Heating, AMPERE 2009 Forschungszentrum Karlsruhe, Fortbildungszentrum fur Technik und Umwelt (FTU), deu 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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