Magnetic Fe 3 O 4 ‑SupportedGold Nanoflowers with Lattice-Selected Surfaces: Preparation and CatalyticPerformance
2020
Nanoflowers
(NFs)shape-controlled noble metal nanocrystalshave
garnered significant attention because of their novel catalytic properties
and applicability. In this paper, we report the preparation and catalytic
performance of a magnetic Fe3O4-supported AuNF
catalyst with a clean surface. The magnetically supported AuNFs were
obtained by using magnetic Fe3O4 as the support.
However, when nonmagnetic γ-Al2O3 was
utilized as the support, the AuNFs did not exhibit a magnetic response.
These supported AuNFs were utilized to catalyze the oxidation of 1-phenylethyl
alcohol to acetophenone using air (1 atm) as the oxidant. The rate
of formation of acetophenone using supported AuNFs was 8-fold higher
than that of acetophenone using supported spherical Au nanoparticles
of comparable size. In addition, the Fe3O4-supported
AuNFs exhibited a higher rate of formation of acetophenone than the
Al2O3-supported AuNFs. The Fe3O4-supported AuNFs were recovered using a magnet, and the recovered
catalyst was reused under identical catalytic reaction conditions.
The rate of formation of acetophenone using recovered Fe3O4-supported AuNFs remained unchanged, demonstrating no
loss of catalytic activity.
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