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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 10
BKCSDE 32(10)
October 20, 2011 

Confined Pt and CoFe2O4 Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity
Donghyeon Kang, Min-Sik Eum, Byeongno Lee, Tae-Sung Bae, Kyu Reon Lee, Heung Bin Lim, Nam Hwi Hur*
Magnetic nanoparticles, Core/Shell silica, Catalyst, Proximity effect
Confined Pt and CoFe2O4 nanoparticles (NPs) in a mesoporous core/shell silica microsphere, Pt-CoFe2O4@meso- SiO2, were prepared using a bi-functional linker molecule. A large number of Pt NPs in Pt-CoFe2O4@meso- SiO2, ranging from 5 to 8 nm, are embedded into the shell and some of them are in close contact with CoFe2O4 NPs. The hydrogenation of cyclohexene over the Pt-CoFe2O4@meso-SiO2 microsphere at 25 oC and 1 atm of H2 yields cyclohexane as a major product. In addition, it gives oxygenated products. Control experiments with 18O-labelled water and acetone suggest that surface-bound oxygen atoms in CoFe2O4 are associated with the formation of the oxygenated products. This oxidation reaction is operative only if CoFe2O4 and Pt NPs are in close contact. The Pt-CoFe2O4@meso-SiO2 catalyst is separated simply by a magnet, which can be re-used without affecting the catalytic efficiency.
3712 - 3719
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