In
the
process
of
biomass
chemical
looping
gasification
using
calcium
ferrite
as
an
oxygen
carrier,
H2O
or
CO2
can
be
injected
into
oxidation
reactor
to
produce
H2
CO
with
high
purity
while
oxidizing
reduced
which
is
a
new
technology
that
has
attracted
wide
attention
in
recent
years.
However,
splitting
reaction
mechanism
still
unclear.
Therefore,
based
on
density
functional
theory
(DFT)
calculations,
adsorption
behavior
and
CO2,
electronic
structure,
path
surface
CaFe2O4
were
systematically
studied
deeply
understand
mechanism.
The
results
show
form
stable
complexes
CaO(111)/Fe(110)
by
chemisorption.
splitted
adsorbed
O*
through
two-step
reaction.
this
process,
step
cracking
HO*
H*
rate-determining
step.
CO*
one-step
reaction,
desorption
from
total
charges
after
are
–0.743
|e|
–0.954
|e|,
respectively,
Fe
atoms
0.931
0.433
respectively.
electron
acceptors,
donors.
carriers
generally
exothermic
reactions,
realize
carrier
provide
heat
for
system.
Catalysts,
Journal Year:
2024,
Volume and Issue:
14(10), P. 670 - 670
Published: Sept. 27, 2024
This
study
investigates
the
impact
of
kaolin
and
boehmite
alumina
binders
on
synthesis,
catalytic
properties,
attrition
resistance
a
La0.7Sr0.3FeO3
(LSF)
perovskite
catalyst
designed
for
chemical
looping
partial
oxidation
(CLPO)
methane
to
produce
synthesis
gas
sustainably.
The
as-synthesized
used
catalysts
with
varying
contents
(KB(x,y)/LSF)
were
scrutinized
by
variety
characterization
methods,
including
XRD,
FE-SEM/EDS,
BET,
TPD-NH3,
TPD-O2
techniques.
activity
synthesized
samples
was
tested
at
800
900
°C
in
fixed-bed
reactor
producing
syngas
through
CLPO
process
over
consecutive
redox
cycles.
Additionally,
fresh
examined
jet
cup
apparatus
assess
their
durability
against
stresses
induced
thermal
shocks
or
changes
crystal
lattice
caused
reactions.
results
showed
pure
structure
KB(x,y)/LSF
demonstrating
adequate
oxygen
adsorption
capacity,
effective
coke
mitigation
capability,
robust
stability,
resilience
agglomeration
during
repetitive
Among
catalysts,
KB(25,15)/LSF
identified
as
superior
sample,
it
could
consistently
suitable
H2:CO
molar
ratio
from
2
3
within
ten
cycles
°C,
CH4
conversion
CO
selectivity
values
up
64%
87%,
respectively.
demonstrated
logarithmic
pattern
tests
room
temperature,
featuring
high
after
erosion
particle
shape
irregularities
weakly
bound
particles.
Moreover,
great
test,
warranting
its
endurance
face
extraordinarily
harsh
conditions
fluidized
bed
reactors
employed
process.
Energies,
Journal Year:
2024,
Volume and Issue:
17(7), P. 1544 - 1544
Published: March 23, 2024
A
syngas
production
process
was
studied
cyclically,
exploiting
the
redox
properties
of
Ce-based
oxygen
carriers.
The
two
steps
looping
cycle
were
investigated
through
thermogravimetric
analysis
and
fixed
bed
experiments.
While
TGA
experiments
focused
on
identification
optimal
temperatures
ranges
for
methane
partial
oxidation
(900–1000
°C)
carrier
regeneration
(400–900
°C),
testing
performed
isothermally
(at
900
or
950
with
a
10%
CH4
feed
stream
in
N2
to
investigate
material
stability
cyclic
performance
reproducibility.
effect
times
carbon
deposition,
specific
yields,
selectivity
inspected,
together
investigation
best
conditions
fully
regenerate
carrier,
adjust
final
ratio,
ensure
stable
performances.
obtained
results
ensured
possibility
work
isothermal
operations,
conversion
up
38%
yields
per
mass
O2
between
4.0–6.8
mmol∙g−1,
preserved
even
across
cycles,
thus
paving
path
development
alternative
effective
processes
production.
Under
operating
lab-scale
experiment,
an
reforming
time
20
min,
corresponding
1.16
characteristic
reaction
kinetics
at
°C.
SolarPACES Conference Proceedings,
Journal Year:
2024,
Volume and Issue:
2
Published: Sept. 16, 2024
In
this
work,
we
performed
a
preliminary
investigation
on
the
redox
behaviour
of
Sr2FeMo0.6Ni0.4O6-δ
(SFMN)
double
perovskite
in
H2-H2O
and
CH4-H2O
cycles
order
to
explore
potential
use
oxide
as
an
Oxygen
Carrier
(OC)
fuel-assisted
Chemical
Looping
Water
Splitting
(CLWS)
processes
driven
by
concentrated
solar
energy.
The
results
were
compared
with
our
previous
findings
Reverse
Gas
Shift
(RWGS-CL)
reaction.
improvement
performance
due
bimetallic
exsolution
OC
surface
is
observed.
This
exhibits
interesting
activity
stability
over
CH4-assisted
CLWS
cycling.
Future
investigations
are
planned
examine
structural
transformations
that
might
impact
material
water
splitting
processes.
Energy & Fuels,
Journal Year:
2024,
Volume and Issue:
38(21), P. 20707 - 20720
Published: Oct. 15, 2024
The
main
pillar
in
the
advancement
of
chemical
looping
(CL)
technology
is
development
oxygen
carriers
that
are
reactive
and
mechanically
resistant
without
neglecting
their
cost
environmental
impact.
In
this
work,
applicability
a
waste
with
high
iron
oxide
content
different
processes
based
on
concept
analyzed.
Experiments
were
performed
TGA
apparatus
under
conditions
would
be
present
CL
processes:
combustion
(CLC),
reforming
or
gasification
(CLR
CLG),
water
CO2
splitting
(CLWS
CO2SPLIT).
carrier
well
even
highly
reduced
maintained
its
reactivity.
Independently
redox
transformation
considered,
it
was
observed
migration
to
surface
FS_GR
particles
took
place.
rate
index
methane
found
Fe2O3/Fe3O4
made
material
promising
for
CLC.
also
met
reactivity
requirements
set
CO2SPLIT
process.
Thus,
will
further
considered
as
potential
diverse
applications.
In
the
process
of
biomass
chemical
looping
gasification
using
calcium
ferrite
as
an
oxygen
carrier,
H2O
or
CO2
can
be
injected
into
oxidation
reactor
to
produce
H2
CO
with
high
purity
while
oxidizing
reduced
which
is
a
new
technology
that
has
attracted
wide
attention
in
recent
years.
However,
splitting
reaction
mechanism
still
unclear.
Therefore,
based
on
density
functional
theory
(DFT)
calculations,
adsorption
behavior
and
CO2,
electronic
structure,
path
surface
CaFe2O4
were
systematically
studied
deeply
understand
mechanism.
The
results
show
form
stable
complexes
CaO(111)/Fe(110)
by
chemisorption.
splitted
adsorbed
O*
through
two-step
reaction.
this
process,
step
cracking
HO*
H*
rate-determining
step.
CO*
one-step
reaction,
desorption
from
total
charges
after
are
–0.743
|e|
–0.954
|e|,
respectively,
Fe
atoms
0.931
0.433
respectively.
electron
acceptors,
donors.
carriers
generally
exothermic
reactions,
realize
carrier
provide
heat
for
system.
