10.1021/acssuschemeng.8b00291.s001
Linfeng Bai
Linfeng
Bai
Wanquan Jiang
Wanquan
Jiang
Mei Liu
Mei
Liu
Sheng Wang
Sheng
Wang
Min Sang
Min
Sang
Shouhu Xuan
Shouhu
Xuan
Xinglong Gong
Xinglong
Gong
General and Facile Method to Fabricate Yolk-like Structural
Magnetic Nanocatalysts
American Chemical Society
2018
RF
CTAB
mesoporous SiO 2
mSiO 2
MP
NP
Fabricate Yolk-like Structural
metal nanoparticles
2018-05-20 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/General_and_Facile_Method_to_Fabricate_Yolk-like_Structural_Magnetic_Nanocatalysts/6394337
A general and facile method for synthesis
of yolk-like nanocomposite
composed of superparamagnetic core and mesoporous SiO<sub>2</sub> (mSiO<sub>2</sub>) shell with functional nanoparticles (Pd, Au, Pt) uniformly
dispersing on their inner wall is reported. First, the magnetic particle
(MP) was modified with resorcinol/formaldehyde resin (RF) layer. Then,
the obtained MP@RF core–shell particle was decorated with functional
metal nanoparticles such as Pd, Au, or Pt (defined as MP@RF-Pd, MP@RF-Au
and MP@RF-Pt, respectively). To protect the metal nanoparticles, another
hybrid CTAB/SiO<sub>2</sub> (hSiO<sub>2</sub>) shell was constructed
on the above particle through the surfactant-templated sol–gel
process. After calcination, the yolk-like nanocomposites such as MP@Void-Pd@mSiO<sub>2</sub>, MP@Void-Au@mSiO<sub>2</sub>, and MP@Void-Pt@mSiO<sub>2</sub> were successfully obtained. Because of the unique yolk-like structure,
the as-prepared nanomaterials can be served as ideal nanoreactors
for heterogeneous catalysis. The Heck reaction and the reduction of <i>p</i>-nitrophenol (4-NP) were introduced as model reactions
to evaluate the catalytic activities of the magnetic nanocatalysts.
Benefitted from the high dispersity of noble metals, large specific
surface area and the mSiO<sub>2</sub> protective shell, all samples
exhibited remarkable catalytic activity and reusability. After 7 cycles,
the activities of MP@Void-Pd@mSiO<sub>2</sub> and MP@Void-Au@mSiO<sub>2</sub> could maintain as high as 98% and 81%, respectively.