Confined Pt and CoFe2O4 Nanoparticles in a Mesoporous Core/Shell Silica Microsphere and Their Catalytic Activity

Bulletin of the Korean chemical society

Heung Bin Lim¹  Donghyeon Kang¹  Kyu Reon Lee¹  Byeongno Lee¹  Nam Hwi Hur¹  Tae-Sung Bae¹  Min-Sik Eum¹ 

关键词: Magnetic nanoparticles;    Core/Shell silica;    Catalyst;    Proximity effect;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

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.

【 授权许可】

Unknown