A novel Pd（ll） organometal catalyst with three-dimensional （3D） cage-like la3d cubic mesoporous structure and high surface area was prepared. In comparison with the corresponding catalyst with two-dimensional （2D...A novel Pd（ll） organometal catalyst with three-dimensional （3D） cage-like la3d cubic mesoporous structure and high surface area was prepared. In comparison with the corresponding catalyst with two-dimensional （2D） P6mm hexagonal mesoporous structure, the as-prepared catalyst exhibited higher activities in the water-medium Suzuki coupling reactions owing to the diminished diffusion limit. It showed comparable efficiencies with the Pd（PPh3）2C12 homogeneous catalyst and could be easily recycled and reused for five times without significant loss of activity.展开更多
A facile approach was developed for synthesizing Au-SH@SO_(3)H-SBA-15 with ordered mesoporous channels by reducing Au^(3+)to Au nanoparticles with SH-group bonded to silica support,followed by in situ coordinating Au ...A facile approach was developed for synthesizing Au-SH@SO_(3)H-SBA-15 with ordered mesoporous channels by reducing Au^(3+)to Au nanoparticles with SH-group bonded to silica support,followed by in situ coordinating Au with the unreacted SH-groups.This catalyst exhibited high efficiency in alkyne hydration owing to the high activity of uniformly dispersed ultrasmall Au nanoparticles,the diminished diffusion limit due to the mesoporous structure,and the promoting effect of acidic SO_(3)H-groups resulting from oxidation of the SH-group by Au^(3+).Meanwhile,the catalyst could be easily recycled and displayed strong durability owing to the strong hydrothermal stability of mesoporous structure and the enhanced stability against Au leaching due to the Au-SH coordination bond.展开更多
文摘A novel Pd（ll） organometal catalyst with three-dimensional （3D） cage-like la3d cubic mesoporous structure and high surface area was prepared. In comparison with the corresponding catalyst with two-dimensional （2D） P6mm hexagonal mesoporous structure, the as-prepared catalyst exhibited higher activities in the water-medium Suzuki coupling reactions owing to the diminished diffusion limit. It showed comparable efficiencies with the Pd（PPh3）2C12 homogeneous catalyst and could be easily recycled and reused for five times without significant loss of activity.
基金the National Natural Science Foundation of China(21237003,21261140333)the Project from College Natural Science Research Plan of Jiangsu Province(13KJB150008)and Project of Huaian City(HAG2013077).
文摘A facile approach was developed for synthesizing Au-SH@SO_(3)H-SBA-15 with ordered mesoporous channels by reducing Au^(3+)to Au nanoparticles with SH-group bonded to silica support,followed by in situ coordinating Au with the unreacted SH-groups.This catalyst exhibited high efficiency in alkyne hydration owing to the high activity of uniformly dispersed ultrasmall Au nanoparticles,the diminished diffusion limit due to the mesoporous structure,and the promoting effect of acidic SO_(3)H-groups resulting from oxidation of the SH-group by Au^(3+).Meanwhile,the catalyst could be easily recycled and displayed strong durability owing to the strong hydrothermal stability of mesoporous structure and the enhanced stability against Au leaching due to the Au-SH coordination bond.
