Pd-based nanoflowers catalysts : controlling size, composition, and structures for the 4-nitrophenol reduction and BTX oxidation reactions.
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2016
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We describe herein the synthesis of solid
Au@Pd and hollow AgPd nanoflowers displaying controlled
sizes and compositions in order to investigate how their size,
composition, and the presence of Au in the core of the
nanoparticles influence their catalytic performance toward
both liquid and gas-phase transformations. While the size
and composition of Au@Pd and AgPd the nanoflowers could
be controlled as function of growth time, their structure
(solid or hollow) was dependent on the nature of the seeds
employed for the synthesis, i.e., Au or Ag nanoparticles.
Moreover, Au@Pd and AgPd nanoflowers were successfully
supported onto commercial silica displaying truly uniform
dispersion. The catalytic activities of Au@Pd and AgPd
nanoflowers were investigated toward the 4-nitrophenol
reduction and the benzene, toluene, and o-xylene (BTX)
oxidation. The catalytic activities for the reduction of
4-nitrophenol decreased as follows: Au58@Pd42[Au27@
Pd73[Ag20Pd80 and Ag8Pd92[Au12@Pd88[Ag38Pd62,
suggesting that the Au core enhanced the catalytic activity
relative to the hollow material when for Pd at.% was up to
80. Regarding the BTX oxidation, supported Au@Pd
displayed higher catalytic activities than AgPd nanoflowers,
also illustrating the role of the Au cores in the nanoflowers
for improving catalytic performance. We believe these
results may serve as a platform for the synthesis of Pd-based
bimetallic nanomaterials that enable the correlation between
these physical/chemical parameters and properties and thus
optimized catalytic activities.
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SILVA, A. G. M. da et al. Pd-based nanoflowers catalysts: controlling size, composition, and structures for the 4-nitrophenol reduction and BTX oxidation reactions. Journal of Materials Science, v. 51, p. 603-614, 2016. Disponível em: <https://link.springer.com/article/10.1007/s10853-015-9315-3>. Acesso em: 05 ago. 2017.