Gold nanoparticles supported on mesoporous silica: origin of high activity and role of Au NPs in selective oxidation of cyclohexane

被引：0
作者：
Pingping Wu
Peng Bai
Zifeng Yan
George X. S. Zhao
机构：
[1] State Key Laboratory of Heavy Oil Processing,
[2] PetroChina Key Laboratory of Catalysis,undefined
[3] School of Chemical Engineering,undefined
[4] China University of Petroleum,undefined
[5] School of Chemical Engineering,undefined
[6] The University of Queensland,undefined
来源：
Scientific Reports | / 6卷
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摘要：
Homogeneous immobilization of gold nanoparticles (Au NPs) on mesoporous silica has been achieved by using a one-pot synthesis method in the presence of organosilane mercapto-propyl-trimethoxysilane (MPTMS). The resultant Au NPs exhibited an excellent catalytic activity in the solvent-free selective oxidation of cyclohexane using molecular oxygen. By establishing the structure-performance relationship, the origin of the high activity of mesoporous supported Au catalyst was identified to be due to the presence of low-coordinated Au (0) sites with high dispersion. Au NPs were confirmed to play a critical role in the catalytic oxidation of cyclohexane by promoting the activation of O2 molecules and accelerating the formation of surface-active oxygen species.
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