Pd–Co
x
O
y
heteroaggregate-encapsulated hollow porous silica
nanoreactors
(Pd–Co
x
O
y
@HPSNs) were synthesized by a reverse microemulsion system.
The key design of the developed reverse microemulsion system is to
use poly(ethyleneimine) in the water droplets as the void templates
for silica deposition and for anchoring the catalytic functionality
inside the hollow silica nanospheres. The synthesized Pd–Co
x
O
y
@HPSNs contain
∼3 nm Pd–Co
x
O
y
hybrid nanostructures in ∼10 nm central cavities
of silica nanospheres and illustrated a significantly promoted efficiency
for hydrodechlorination of a series of chlorophenols into phenols
under mild reaction conditions. The catalytic enhancement of Pd–Co
x
O
y
@HPSNs is ascribed
to the synergistic effect between Pd and Co
x
O
y
and the protection of silica
shells to the inner catalytic functionality.
In this work, mesoporous silica SBA-16-supported NiCo
bimetallic
nanocatalysts were synthesized by coimpregnation of Ni and Co precursors
followed by calcination and reduction, and various characterization
techniques confirm the formation of NiCo bimetallic nanostructures
in the catalysts. The synthesized NiCo/SBA-16 shows enhanced catalytic
performance for hydrogenation of a series of nitroaromatics. Under
the reaction conditions of 80 °C and 1.0 MPa of H2, the yields of aniline for nitrobenzene hydrogenation over NiCo0.3/SBA-16 can reach more than 99% at 2.0 h. The enhanced catalytic
performance can be ascribed to the formation of NiCo bimetallic nanostructures,
where the synergistic effect between Ni and Co improves their catalytic
activities for hydrogenation of nitroaromatics.
In this work, Au−Cu x O y hybrid nanoparticle-encapsulated hollow porous silica nanospheres (Au−Cu x O y in HPSNs) were synthesized by immobilizing the catalytic functionality inside hollow cavities by using polyethyleneimine in a reverse microemulsion system as the void template as well as the platform to deliver the metals into the central voids. Compared with individual Au in HPSNs and Cu x O y in HPSNs, the prepared Au−Cu x O y in HPSNs demonstrate significantly improved catalytic efficiency for the reduction of various nitrophenols with NaBH 4 . At the molar ratio of 4-nitrophenol/Au of 30/1, the 4nitrophenol conversions over Au−Cu x O y in HPSNs reach 100% within 5.5 min, and catalytic efficiency is maintained during five cycles of catalytic reactions. The enhanced performance can be ascribed to the synergistic effect between Au and Cu x O y , and the protection of silica shells to inner Au−Cu x O y improve their catalytic stability.
Metrics & MoreArticle Recommendations I n our original article (https://pubs.acs.org/doi/10.1021/ acsami.2c13904), in Figure 3a, we unintentionally misused the XRD pattern of the sample Pd 1 -(Co x O y ) 1/x @HPSNs for the sample Pd@HPSNs. This error has no effect on the results or conclusions of the paper. The correct Figure 3 is shown here. Figure 3. (a) XRD patterns of Pd@HPSNs and Pd 1 -(Co x O y ) 1/x @ HPSNs synthesized by calcination at 500 °C and subsequent H 2 reduction at 200 °C. (b) Fourier transform infrared (FT-IR) spectra of Pd 1 -(Co x O y ) 1/x @HPSNs before and after calcination.
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