Issue 6, 2015

Selective oxidation of benzyl alcohol to benzaldehyde with H2O2 in water on epichlorohydrin-modified Fe3O4 microspheres

Abstract

Epichlorohydrin (ECH)-modified Fe3O4 microspheres were prepared in ethylene glycol by either in situ or post-synthetic modification and characterized via XRD, SEM, FTIR and VSM techniques. Modification by ECH was found to significantly enhance the catalytic activity of Fe3O4 microspheres in the selective oxidation of benzyl alcohol to benzaldehyde with H2O2 (yield: 8% vs. 34% before and after modification by ECH, respectively). Fe3O4 microspheres were magnetically recoverable and reusable at least five times without loss of catalytic activity and selectivity after being rejuvenated by a combined activation procedure comprising NaBH4 reduction and ECH modification. Theoretical and experimental investigations confirmed that the ECH-modification promoted the adsorption and decomposition of H2O2 on Fe3O4 microspheres via hydrogen bonding and facilitated the formation of hydroxyl radicals by increasing the collision frequency between H2O2 and Fe3O4 by about 10 orders of magnitude, which contributed to much better catalytic activity of ECH-modified Fe3O4 microspheres.

Graphical abstract: Selective oxidation of benzyl alcohol to benzaldehyde with H2O2 in water on epichlorohydrin-modified Fe3O4 microspheres

Article information

Article type
Paper
Submitted
20 Feb 2015
Accepted
16 Apr 2015
First published
16 Apr 2015

New J. Chem., 2015,39, 4924-4932

Selective oxidation of benzyl alcohol to benzaldehyde with H2O2 in water on epichlorohydrin-modified Fe3O4 microspheres

S. Xiao, C. Zhang, R. Chen and F. Chen, New J. Chem., 2015, 39, 4924 DOI: 10.1039/C5NJ00434A

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