Energies,
Год журнала:
2024,
Номер
17(21), С. 5421 - 5421
Опубликована: Окт. 30, 2024
This
numerical
study
investigates
the
impact
of
reaction
temperature,
molar
ratio
CH4:CO2,
and
catalyst
porosity
(εp)
on
H2
yield
selectivity
during
biogas
dry
reforming
over
a
Ni/Cr
catalyst.
Using
COMSOL
Multiphysics,
we
conducted
detailed
simulations
to
elucidate
underlying
characteristics.
Our
findings
reveal
that
increasing
εp
from
0.1
0.95
significantly
provides
5
times
increase
in
production
2.3%
while
simultaneously
reducing
CO
by
2.3%.
effect
is
attributed
improved
mass
transfer
within
bed,
leading
more
efficient
reactant
conversion
product
formation.
Additionally,
observed
strong
correlation
between
higher
temperatures
increased
selectivity.
By
optimizing
these
operational
parameters,
our
results
suggest
catalysts
can
be
effectively
employed
for
sustainable
biogas.
Energies,
Год журнала:
2023,
Номер
16(17), С. 6375 - 6375
Опубликована: Сен. 2, 2023
The
article
provides
a
short
review
on
catalyst-based
processes
for
the
production
of
hydrogen
starting
from
methane,
both
fossil
origin
and
sustainable
processes.
three
main
paths
steam-
dry-reforming,
partial
oxidation
thermo-catalytic
decomposition
are
briefly
introduced
compared,
above
all
with
reference
to
latest
publications
available
new
catalysts
which
obey
criteria
lower
environmental
impact
minimize
content
critical
raw
materials.
novel
strategies
based
chemical
looping
CO2
utilization,
membrane
separation,
electrical-assisted
(plasma
microwave)
processes,
multistage
reactors
catalyst
patterning
also
illustrated
as
most
promising
perspective
CH4
reforming,
especially
small
medium
scale.
Although
these
should
only
be
considered
at
limited
level
technological
readiness,
research
topics,
including
development
process
optimization,
represents
crucial
challenge
scientific
community.
Energy & Fuels,
Год журнала:
2023,
Номер
37(11), С. 7945 - 7957
Опубликована: Май 19, 2023
In
this
study,
we
successfully
developed
nickel
(Ni)-modified
tungstate
zirconia
(Ni/WO3/ZrO2)
as
an
effective
material
for
chemical
looping
dry
reforming
of
methane
(CL-DRM)
under
isothermal
conditions
(750
°C).
The
performance
Ni/WO3/ZrO2
strongly
depended
on
the
WO3
loading
amount.
optimal
amount
10.0
wt%
WO3,
corresponding
to
low
surface
W
density
(<4
atoms/nm2),
in
Ni/WO3(10)/ZrO2
resulted
exclusive
formation
dispersed
species,
such
isolated
monotungstate
and/or
oligomeric
polytungstate
species.
Increasing
30.0
(higher
(>4
atoms/nm2))
crystalline
diminishing
CL-DRM
over
Ni/WO3/ZrO2.
Comprehensive
characterization,
including
situ/operando
L3-/L1-,
Ni
K-,
and
Zr
K-edge
X-ray
absorption
spectroscopy
studies,
revealed
that
species
were
reduced
by
CH4
yield
CO
H2,
low-valent
assignable
W0
W3+.
reoxidized
CO2
produce
regenerate
original
W6+
These
active
cooperatively
work
with
ZrO2
promote
partial
oxidation,
leading
efficient
CL-DRM.
Catalysts,
Год журнала:
2023,
Номер
13(10), С. 1357 - 1357
Опубликована: Окт. 10, 2023
Given
that
the
attempts
to
head
toward
a
hydrogen
economy
are
gathering
pace,
dry
reforming
of
methane
(DRM)
produce
hydrogen-rich
syngas
is
reaction
worthy
investigation.
Nickel-based
catalysts
have
been
extensively
examined
as
cost-effective
solution
for
DRM,
though
they
suffer
from
fast
deactivation
caused
by
coke
accumulation.
However,
number
published
studies
report
high
catalytic
performance
in
terms
both
activity
and
stability
La–Ni-based
perovskite-derived
used
DRM
comparison
other
corresponding
materials.
In
work
presented
herein,
thorough
analysis
regarding
application
perovskite
carried
out.
LaNiO3
known
its
anti-coking
ability
owing
strong
interaction
between
CO2
La2O3.
A
further
modification
improve
can
be
achieved
partial
or
complete
substitution
or/and
B
sites
catalysts.
The
latest
developments
with
respect
this
topic
also
discussed
manuscript.
Even
low
surface
area
has
always
an
obstacle
their
commercialization,
new
supported
porous
materials
recently
emerged
address,
at
least
partly,
challenge.
Finally,
conclusions
future
outlooks
developing
novel
may
potentially
pioneer
technology
included.
Catalysts,
Год журнала:
2024,
Номер
14(6), С. 355 - 355
Опубликована: Май 30, 2024
The
deactivation
of
active
sites
caused
by
high-temperature
sintering
and
the
deposition
a
large
amount
carbon
are
main
difficulties
in
reforming
methane
using
Ni-based
catalysts.
La,
as
promoter,
has
an
ameliorating
effect
on
defects
In
this
article,
mechanism
action
catalysts
with
introduction
rare-earth
metal
additive
La
was
reviewed,
effects
methane-reforming
performance
were
examined.
physical
properties,
alkalinity,
activity
can
be
enhanced
use
auxiliary
agent
which
promotes
conversion
CH4
CO2
well
selectivity
towards
H2
CO
formation
methane.
reason
why
could
maintain
long-term
stability
presence
discussed.
Furthermore,
current
state
research
different
amounts
at
home
abroad
analyzed.
It
found
that
2–5
wt.%
is
most
optimal
quantity
for
improving
catalyst
stability,
chemisorption.
limitations
directions
future
