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Article

Microwave-Assisted Solvothermal Synthesis of Fe3O4/CeO2 Nanocomposites and Their Catalytic Activity in the Imine Formation from Benzyl Alcohol and Aniline

1
Dipartimento di Ingegneria Civile, Ambientale, del Territorio, Edile e di Chimica Politecnico di Bari, via Edoardo Orabona 4, 70126 Bari, Italy
2
Dipartimento di Scienze del Suolo, della Pianta e degli Alimenti, Università degli Studi di Bari “Aldo Moro”, via Giovanni Amendola 165/A, 70126 Bari, Italy
3
Dipartimento di Chimica, Università degli Studi di Bari “Aldo Moro”, via Edoardo Orabona 4, 70126 Bari, Italy
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(11), 1325; https://doi.org/10.3390/catal10111325
Received: 1 October 2020 / Revised: 6 November 2020 / Accepted: 12 November 2020 / Published: 14 November 2020
Fe3O4/CeO2 nanocomposites were synthetized by coating magnetite seeds of different morphologies (hexagonal, spheroidal, quasi-spherical) with ceria, in ethylene glycol as solvothermal solvent. The synthesis was performed in the presence of microwave irradiation aiming to overcome the common disadvantages proper of the classic solvothermal/hydrothermal procedure. The obtained nanocomposites were calcined at the optimum temperature of 550 °C. The structure of the new nanomaterials was carefully investigated by IR, XRD, SEM, EDS and TEM analyses. The nanocomposites resulted to be constituted by CeO2 nanoparticles distributed onto Fe3O4 seeds, that kept their pristine morphology. The new materials were used as catalysts for imine synthesis from benzyl alcohol and aniline. The highest imine conversion rate was obtained with Fe3O4/CeO2, which was synthesized from Fe3O4 nanoparticles (hexagonal) obtained by microwave hydrothermal procedure in the absence of any organic additive (polyvinylpyrrolidone, trisodium citrate dihydrate or oleic acid). The catalyst could be easily removed from the reaction mixture with the help of an external magnet, and it was recycled for at least five runs with increasing catalytic activity. View Full-Text
Keywords: Fe3O4/CeO2 nanocomposites; cerium oxide; microwave-assisted solvothermal synthesis; imine synthesis; redox chemistry Fe3O4/CeO2 nanocomposites; cerium oxide; microwave-assisted solvothermal synthesis; imine synthesis; redox chemistry
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MDPI and ACS Style

Rizzuti, A.; Dipalo, M.C.; Allegretta, I.; Terzano, R.; Cioffi, N.; Mastrorilli, P.; Mali, M.; Romanazzi, G.; Nacci, A.; Dell’Anna, M.M. Microwave-Assisted Solvothermal Synthesis of Fe3O4/CeO2 Nanocomposites and Their Catalytic Activity in the Imine Formation from Benzyl Alcohol and Aniline. Catalysts 2020, 10, 1325. https://doi.org/10.3390/catal10111325

AMA Style

Rizzuti A, Dipalo MC, Allegretta I, Terzano R, Cioffi N, Mastrorilli P, Mali M, Romanazzi G, Nacci A, Dell’Anna MM. Microwave-Assisted Solvothermal Synthesis of Fe3O4/CeO2 Nanocomposites and Their Catalytic Activity in the Imine Formation from Benzyl Alcohol and Aniline. Catalysts. 2020; 10(11):1325. https://doi.org/10.3390/catal10111325

Chicago/Turabian Style

Rizzuti, Antonino, Maria C. Dipalo, Ignazio Allegretta, Roberto Terzano, Nicola Cioffi, Piero Mastrorilli, Matilda Mali, Giuseppe Romanazzi, Angelo Nacci, and Maria M. Dell’Anna 2020. "Microwave-Assisted Solvothermal Synthesis of Fe3O4/CeO2 Nanocomposites and Their Catalytic Activity in the Imine Formation from Benzyl Alcohol and Aniline" Catalysts 10, no. 11: 1325. https://doi.org/10.3390/catal10111325

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