Catalysts,
Journal Year:
2023,
Volume and Issue:
13(5), P. 797 - 797
Published: April 24, 2023
The
chemical
looping
oxidative
dehydrogenation
of
propane
to
propylene
(CL-ODHP)
replaces
molecular
oxygen
with
lattice
(Olatt)
in
carriers.
This
method
boosts
selectivity
by
avoiding
the
deep
oxidation
propane.
Herein,
a
series
10V-XCe/Al
carriers
different
Ce
contents
were
prepared
realize
VOx-CeOy
interactions.
effect
content
on
CL-ODHP
reaction
was
studied
and
optimal
determined.
CeO2
prevents
outward
diffusion
evolution
Olatt
VOx
adsorbed
electrophilic
species
(Oelec),
effectively
inhibiting
loss
Olatt,
improving
propylene,
extending
lifetime
activity
After
characterizing
analyzing
carriers,
it
found
that
10V-3Ce/Al
has
highest
specific
surface
area,
capacity,
lowest
reducibility.
also
delivers
performance.
At
550
°C,
average
COx
values
81.87%
7.28%,
respectively
(vs.
62.79%
25.64%
respectively,
for
10V/Al).
It
is
demonstrated
exhibits
good
cycle
stability
no
significant
decrease
catalytic
performance
after
15
cycles.
In
situ
diffuse-reflectance
infrared
Fourier-transform
spectroscopy
indicates
undergoes
Mars-van
Krevelen
mechanism.
migration
controlled
reasonably
modifying
metal
oxide
interactions
improve
yield.
work
will
thus
guide
subsequent
development
novel
efficient
Carbon Energy,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Aug. 2, 2024
Abstract
Crystalline
perovskite
oxides
are
regarded
as
promising
electrocatalysts
for
water
electrolysis,
particularly
anodic
oxygen
evolution
reactions,
owing
to
their
low
cost
and
high
intrinsic
activity.
Perovskite
with
noncrystalline
or
amorphous
characteristics
also
exhibit
electrocatalytic
performance
toward
electrochemical
splitting.
In
this
review,
a
fundamental
understanding
of
the
advantages
crystalline,
noncrystalline,
is
presented.
Subsequently,
recent
progress
in
development
advanced
electrolysis
by
engineering
breaking
crystallinity
reviewed,
special
focus
on
underlying
structure–activity
relationships.
Finally,
remaining
challenges
unsolved
issues
presented,
an
outlook
briefly
proposed
future
exploration
next‐generation
water‐splitting
based
oxides.
Energy,
Journal Year:
2024,
Volume and Issue:
298, P. 131307 - 131307
Published: April 17, 2024
One
mixed
oxide
with
5
cations
in
equimolar
proportions
the
sublattice,
to
fulfil
high-entropy
(HEO)
criteria,
has
been
developed
and
investigated
as
oxygen
carrier
for
chemical
looping
combustion
processes.
As
far
we
know,
nobody
explored
this
class
of
material
combustion.
Material
is
prepared
by
direct
mixing
five
metal
oxides
(CuO,
Mn2O3,
Fe2O3,
TiO2,
MgO),
followed
calcination
at
1000,
1100
1200
°C
6h
air.
XRD
characterization
provides
strong
evidence
that
synthesized
carriers
possess
hallmark
properties
HEO,
SEM-EDX
analysis
shows
an
overall
homogeneous
distribution.
Materials
have
one
main
cubic
phase
empirical
formula
MnCuMgFeTiO7,
dominating
under
all
conditions.
key
objectives
study
achieved,
reduce
stress
during
redox
cycles.
Oxygen
transfer
capability
thermogravimetric
batch
fluidized
bed
reactor
experiments
different
fuels
atmospheres.
Mass-based
transport
capacities
lattice
uncoupling
are
around
5.5wt%
1.1wt%,
respectively.
This
work
opens
up
a
new
dimension
future
preparation
processes,
since
vast
compositional
space
HEO
opportunities
tune
both
physical
characteristics.
Perovskites,
owing
to
their
unique
structure,
tunable
chemical
composition,
and
versatile
physicochemical
properties,
have
garnered
extensive
applications,
particularly
in
redox
reactions
where
the
lattice
oxygen
and/or
vacancies
within
perovskite
are
identified
as
active
sites.
The
modulation
of
activity
perovskites
is
crucial
for
enhancing
performance
perovskite-type
oxides
reactions.
This
review
delineates
key
factors
affecting
activity,
including
distortions,
crystal
defects,
surface
interface
effects,
migration
rate
ions,
elucidates
how
these
synergistically
influence
oxygen.
A
range
strategic
approaches,
ionic
doping,
modification,
metal
exsolution,
proposed
effectively
regulate
behavior
catalytic
properties
In
this
investigation,
we
consolidate
a
series
analytical
testing
methodologies,
such
XRD,
XPS,
ECR,
EIS,
TGA,
among
others,
with
focus
on
reveal
fundamental
relationship
between
structural
functional
attributes
carriers.
comprehensive
offers
profound
insights
guidance
design
optimization
catalysts
or
Industrial & Engineering Chemistry Research,
Journal Year:
2024,
Volume and Issue:
63(20), P. 9018 - 9025
Published: May 10, 2024
The
core–shell
structure
has
been
widely
acknowledged
as
an
effective
design
strategy
for
oxygen
carriers
in
the
chemical
looping
oxidative
dehydrogenation
(CL-ODH)
of
ethane.
In
this
work,
a
molybdenum-promoted
CuMn2O4
carrier
with
was
prepared
and
characterized.
interaction
between
MoO3
during
preparation
process
results
formation
nonmolten
shell
MnMoO4
that
encapsulates
CuMn2O4,
thereby
significantly
enhancing
its
capacity
selective
oxidation
Experimental
indicated
presence
increased
ethylene
selectivity
from
below
10%
to
80.7%.
Additionally,
CuMn2O4@MnMoO4
still
exhibits
high
11.3
wt
%
3.1
%.
Thirty
redox
cycle
experiments
demonstrated
exceptional
performance
terms
multicycle
reactions,
ethane
throughput
90
mL/gcat/cycle
85%
selectivity.
combination
characteristics
provides
valuable
insights
designing
CL-ODH.
