Carbon-encapsulated Fe3O4 for catalyzing the aerobic oxidation of benzyl alcohol and benzene
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A carbon-encapsulated Fe3O4 (Fe3O4@C) was prepared by a simple solvothermal method. The obtained Fe3O4@C was characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and nitrogen adsorption–desorption isotherm measurement. The core–shell structured Fe3O4@C could efficiently catalyze the solvent-free aerobic oxidation of benzyl alcohol to benzaldehyde with ambient O2 as the oxidant. The uniform interface between the core Fe3O4 and the shell C accounted for the superior catalytic activity of Fe3O4@C. A possible catalytic process following the known Mars-van Krevelen mechanism was described. The target catalyst could be magnetically recycled and exhibited good potential for catalyst reuse. Besides, the activity of Fe3O4@C was also investigated for catalyzing the reductant-free aerobic hydroxylation of benzene to phenol with O2 as the oxidant.
KeywordsCarbon-encapsulated Fe3O4 Magnetically recoverable Selective oxidation Benzyl alcohol Benzene
The authors are thankful to financial support from the NSFC (Nos. 21503098, 21701063 and 21603089), Jiangsu Province Science Foundation for Youths (BK20150237 and BK20160209), NSF of the Higher Education Institutions of Jiangsu Province (16KJB150014).
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Conflict of interest
The authors declare that they have no conflict of interest.