Confined Pt and CoFe_2O_4 Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity

Confined Pt and CoFe_2O_4 nanoparticles (NPs) in a mesoporous core/shell silica microsphere, Pt-CoFe_2O_4@meso-SiO_2, were prepared using a bi-functional linker molecule. A large number of Pt NPs in Pt-CoFe_2O_4@meso-SiO_2, ranging from 5 to 8 nm, are embedded into the shell and some of them are in...

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Bibliographic Details
Published in:Bulletin of the Korean Chemical Society 2011, 32(10), , pp.3712-3719
Main Authors: Donghyeon Kang, 임흥빈, Kyu Reon Lee, Tae-Sung Bae, 이병노, Min-Sik Eum, 허남회
Format: Article
Language:English
Subjects:
화학
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Summary:Confined Pt and CoFe_2O_4 nanoparticles (NPs) in a mesoporous core/shell silica microsphere, Pt-CoFe_2O_4@meso-SiO_2, were prepared using a bi-functional linker molecule. A large number of Pt NPs in Pt-CoFe_2O_4@meso-SiO_2, ranging from 5 to 8 nm, are embedded into the shell and some of them are in close contact with CoFe_2O_4NPs. The hydrogenation of cyclohexene over the Pt-CoFe_2O_4@meso-SiO_2 microsphere at 25 ^oC and 1 atm of H_2 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 CoFe_2O_4 are associated with the formation of the oxygenated products. This oxidation reaction is operative only if CoFe_2O_4 and Pt NPs are in close contact. The Pt-CoFe_2O_4@meso-SiO_2 catalyst is separated simply by a magnet, which can be re-used without affecting the catalytic efficiency. KCI Citation Count: 6
ISSN:0253-2964
1229-5949