Surface
active
oxygen
species
in
heterogeneous
catalyst
material
is
very
vital
for
driving
catalytic
volatile
organic
compounds
(VOCs)
oxidation
but
still
difficult
to
rationally
modulate.
Herein,
the
interfacial
Pt/WO3
conveniently
activated
by
a
heating
treatment
under
nitrogen
flow.
The
obtain
Pt/WO3-N2-T
(T=
200,
400,
600,
represents
calcination
temperature)
shows
much
superior
activity
than
bare
catalyst,
particularly
Pt/WO3-N2-400
with
T95
of
only
250
oC
(T95
=
350
oC).
changes
structure
during
flow
contributes
improved
activity,
including
re-dispersed
WO3
support
and
Pt
nanoparticles.
More
importantly,
surface
more
that
which
generated
removing
hydroxyl
groups
its
residual
nearby
species.
These
novel
findings
provide
strategy
activate
materials
reaction.
Inorganic Chemistry,
Год журнала:
2024,
Номер
63(36), С. 16842 - 16854
Опубликована: Авг. 23, 2024
Transition
metal-based
oxides
with
similar
oxidation
activities
for
catalytic
hydrocarbon
combustion
have
attracted
much
attention.
In
this
study,
a
new
class
of
metal
high-entropy
(Co
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 21, 2024
The
efficient
catalytic
oxidation
of
propane,
as
a
short-chain
alkane,
remains
challenging
in
environmental
catalysis.
High-entropy
oxides
(HEOs)
exhibit
advantages
abundant
and
well-dispersed
elemental
composition,
exceptional
thermal
stability,
enriched
lattice
defects.
Herein,
(CrMnFeCoNi)Ox
HEO
catalysts
are
successfully
synthesized
by
using
continuous
hydrothermal
flow
synthesis
(CHFS)
route,
without
any
subsequent
calcination
processes.
This
route
yields
HEOs
with
fine
particle
sizes,
high
specific
surface
areas,
near-surface
oxygen
compared
to
the
traditional
coprecipitation
method.
Notably,
propane
conversion
over
CHFS-made
reaches
90%
at
255
°C,
an
apparent
activation
energy
53.2
kJ/mol,
mainly
attributed
its
enhanced
mobility
that
prevent
accumulation
acetates
consequent
occupation
active
sites.
In
comparison
commercial
Pt/Al2O3
Pd/Al2O3,
demonstrates
activity
can
maintain
long-term
stability
under
high-temperature
(upon
650
°C)
moisture-rich
conditions
(at
2–10
vol
%).
These
attributes
highlight
potential
promising
substitute
for
noble
metal
industrial
applications.
Chemical Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 27, 2024
This
review
provides
an
overview
of
the
advances
in
high
entropy
spinel
oxides
diverse
catalytic
reactions
and
highlights
intrinsic
structure–property–performance
relationships.
Batteries & Supercaps,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 25, 2024
Abstract
Disordered
high
entropy
spinels
(HES)
(Cr,Fe,Mn,Co,Ni)
3
O
4
were
obtained
by
solid‐state
synthesis
and
co‐precipitation
using
various
powder
precursors.
They
characterized
a
complex
of
physico‐chemical
methods
investigated
as
anode
materials
for
lithium‐ion
batteries
(LIBs).
According
to
XRD
TEM
data,
the
are
single‐phase.
The
structural
characterization
samples
at
773,
973,
1273
K
was
determined
Raman
Mössbauer
spectroscopy,
magnetic
measurements.
degree
spinel
inversion
lattice
distortion
(microstrains)
decrease
with
increasing
temperature,
while
crystallite
size
increases.
insufficient
nickel
content
in
ensures
more
uniform
distribution
iron
cations
both
sublattices,
which
leads
an
increase
parameters
has
positive
effect
on
de‐/lithiation.
Repeated
ball‐milling
HES
material,
prepared
co‐precipitation,
increases
its
specific
capacity
from
284
mAh
g
−1
492
current
density
100
mA
after
25
cycles.
Besides,
smaller
reduces
volume
changes
during
Surface
active
oxygen
species
in
heterogeneous
catalyst
material
is
very
vital
for
driving
catalytic
volatile
organic
compounds
(VOCs)
oxidation
but
still
difficult
to
rationally
modulate.
Herein,
the
interfacial
Pt/WO3
conveniently
activated
by
a
heating
treatment
under
nitrogen
flow.
The
obtain
Pt/WO3-N2-T
(T=
200,
400,
600,
represents
calcination
temperature)
shows
much
superior
activity
than
bare
catalyst,
particularly
Pt/WO3-N2-400
with
T95
of
only
250
oC
(T95
=
350
oC).
changes
structure
during
flow
contributes
improved
activity,
including
re-dispersed
WO3
support
and
Pt
nanoparticles.
More
importantly,
surface
more
that
which
generated
removing
hydroxyl
groups
its
residual
nearby
species.
These
novel
findings
provide
strategy
activate
materials
reaction.
