Brønsted Acid Site Catalytic Role in Methane Dehydroaromatization over Mo/HZSM-5
ACS Catalysis,
Год журнала:
2024,
Номер
14(15), С. 11591 - 11603
Опубликована: Июль 20, 2024
Язык: Английский
Insights into the coking and regeneration processes of methanol promoted methane dehydroaromatization reaction over Mo-ZSM-5/ZSM-11 intergrown zeolites
Applied Catalysis A General,
Год журнала:
2025,
Номер
unknown, С. 120097 - 120097
Опубликована: Янв. 1, 2025
Язык: Английский
Evolution, Speciation, and Distribution of Mo Oxides in MFI-Type Zeolites
The Journal of Physical Chemistry C,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 10, 2025
Язык: Английский
Identification and evolution of active sites in isomorphously substituted Fe-ZSM-5 catalysts for methane dehydroaromatization (MDA)
Journal of Catalysis,
Год журнала:
2025,
Номер
unknown, С. 116090 - 116090
Опубликована: Март 1, 2025
Язык: Английский
Improving Metal Dispersion Over Mo‐based TNU‐9 for Methane Dehydro‐Aromatization
ChemistrySelect,
Год журнала:
2025,
Номер
10(15)
Опубликована: Апрель 1, 2025
Abstract
The
initial
dispersion
and
state
of
the
Mo‐oxide
in
zeolite
are
crucial
factors
development
active
phase
selectivity
toward
target
product
(benzene,
toluene,
naphthalene),
which
greatly
affects
catalytic
activity
Mo‐doped
HTNU‐9
methane
dehydro‐aromatization
(MDA).
To
investigate
their
impact
on
MDA,
Mo
oxide
precursors
(α‐MoO
3
commercial
MoO
)
applied
this
case.
dispersibility
is
enhanced
by
employing
solid‐phase
grinding
method
α‐MoO
onto
support.
SEM,
EDS
mapping,
NH
‐TPD,
1
H
MAS
NMR,
2
‐TPR,
Raman,
UV–vis
instruments
used
to
thoroughly
key
properties
Mo‐containing
catalysts.
Based
results
MDA
test,
catalyst
generated
using
‐modified
carrier
has
a
conversion
rate
that
13.7%
higher
than
Mo(C)/TNU‐9
(11.4%).
Mo(N)/TNU‐9
thought
be
due
use
initially
scattered
species.
During
calcination,
species
incorporated
into
framework
subsequently
transforms
more
reactive
utilization
an
elevated
formation
resistance
hard
coke
easily‐burned
polyaromatics.
Язык: Английский
Advances and Challenges in Designing Active Site Environments in Zeolites for Brønsted Acid Catalysis
Chemical Communications,
Год журнала:
2024,
Номер
unknown
Опубликована: Янв. 1, 2024
Synthetic
and
post-synthetic
strategies
control
the
placement
of
active
sites
in
void
environments
varying
sizes,
which
turn
influence
reactivity
selectivity
during
catalysis
by
(de)stabilizing
reactive
intermediates
transition
states.
Язык: Английский
Impact of Iron Species Dispersion on Fe/ZSM‐5 Catalyst Performance for Methane Dehydroaromatization (MDA)
ChemCatChem,
Год журнала:
2024,
Номер
16(18)
Опубликована: Июнь 4, 2024
Abstract
Methane
dehydroaromatization
(MDA)
is
one
of
the
most
promising
technologies
for
directly
transforming
methane
into
aromatics.
Unlike
extensively
investigated
Mo/ZSM‐5
catalysts,
structure
and,
consequently,
catalytic
activity
Fe/ZSM‐5
are
markedly
influenced
by
method
preparation,
as
shown
here.
In
this
study,
we
prepared
2
%
and
4
catalysts
via
wet
impregnation
(WI)
incipient
wetness
(IWI).
Characterizations
(XRD,
STEM,
UV‐Vis,
NH
3
‐TPD
H
‐TPR)
reveal
that
%Fe‐WI
mainly
possesses
isolated
or
low‐polymerized
Fe
species
within
zeolite
channels,
leading
to
a
rapid
activation
higher
benzene
yield
due
faster
reduction
iron
suboxides
under
MDA
conditions.
contrast,
%Fe‐IWI
contains
bulk
oxide
aggregates,
resulting
in
slower
these
aggregates
transform
carbide
through
successive
carbonization.
A
deactivation
kinetic
study
applied
further
demonstrates
quantitative
relation
between
site
isolation
activity.
Although
both
inevitably
form
sizable
clusters
particles
high
Fe/Al
ratio,
similar
trends
noted,
with
WI
exhibiting
shorter
induction/activation
period
benzene,
paralleling
observations
made
catalysts.
Язык: Английский
Reaction Fundamentals and Reactor Configuration for Methane Dehydroaromatization: Present State and Future Prospects
Energy & Fuels,
Год журнала:
2024,
Номер
38(21), С. 20112 - 20140
Опубликована: Окт. 16, 2024
Natural
gas,
mainly
composed
of
methane,
has
gained
attention
in
conversion
technologies
due
to
its
increased
supply
and
low
prices
relative
crude
oil.
It
is
important
the
current
energy
landscape,
significance
expected
persist
future,
supporting
transition
toward
a
more
sustainable
low-carbon
future.
The
natural
gas
into
chemicals
with
added
value
offers
way
utilize
this
abundant
resource,
while
promoting
security
decreasing
pollutant
emissions.
However,
direct
nonoxidative
methane
dehydroaromatization
(MDA)
still
initial
research
stage,
there
are
uncertainties
about
enhancement
approaches
create
commercially
feasible
process.
We,
hence,
conducted
thorough
review
critical
factors
that
influence
development
efficient
MDA
processes.
These
include
thermodynamic
constraints,
catalyst
design,
reaction
mechanism,
kinetic
models,
activation
pathways,
activity,
selectivity
desired
products.
As
core
review,
we
discussed
various
reactor
configurations
for
process,
including
packed
bed,
fluidized
membrane-assisted,
plasma,
microwave
reactors.
Detailed
analyses
were
assess
these
reactors'
strengths,
weaknesses,
opportunities,
threats.
help
select
an
effective
not
only
overcomes
constraints
deactivation
challenges
but
also
satisfies
requirements
implementation
on
commercial
scale.
commercial-scale
plant
essential,
further
focused
summarizing
accomplished
modeling
plant-wide
economic
assessment
studies
Based
our
analyses,
proposed
conceptual
design
dual-bed
circulating
membrane
bed
as
emerging
configuration
reaction.
Язык: Английский