Minerals,
Год журнала:
2024,
Номер
14(11), С. 1141 - 1141
Опубликована: Ноя. 11, 2024
The
purification
and
removal
of
polar
impurities
in
olefin
feedstocks
is
crucial
for
downstream
deep
processing,
adsorption
the
main
method
such
impurities.
This
article
takes
dimethyl
ether,
a
typical
oxygen-containing
compound
impurity
MTOs,
as
molecule,
LTA
FAU
topological
zeolites
research
objects.
influence
zeolite
topology,
morphology,
skeleton
silicon–aluminum
(Si/Al)
ratio,
ion
type
on
trace
ether
was
investigated
by
XRD,
SEM,
XRF,
nitrogen
adsorption–desorption
methods.
show
better
performance
owing
to
their
larger
specific
surface
area
unobstructed
pores
compared
with
zeolites.
Among
zeolites,
NaX
lower
framework
silica–alumina
ratio
has
highest
capacity
ether.
Magnesium
exchange
(MgNaX)
reduce
zeolite.
However,
after
forming
alumina
binder,
MgNaX–Al2O3
adsorbent
about
13%
higher
than
that
NaX–Al2O3
without
Mg
exchange.
may
be
due
decomposition
residual
organic
salts
samples
during
high-temperature
calcination,
resulting
formed
adsorbent.
Further
characterization
NH3–TPD
CO2–TPD
shows
weakens
acid–base
active
sites
surface.
reduction
reduces
occurrence
side
reactions
polymerization
isomerization
caused
exothermic
olefins
adsorbents.
Repeated
data
excellent
regeneration–adsorption
performance.
The Journal of Physical Chemistry Letters,
Год журнала:
2024,
Номер
15(7), С. 1890 - 1898
Опубликована: Фев. 12, 2024
La2Zr2O7
pyrochlore
with
intrinsic
oxygen
vacancies
and
BaZrO3
perovskite
without
were
synthesized
for
the
OCM
reaction.
It
has
been
revealed
that
performance
surface
selective
species
of
are
higher
than
under
reaction
condition.
This
is
because
possesses
more
basic
sites
La2Zr2O7,
thus
it
can
stabilize
reactive
better
at
elevated
temperature.
In
structure,
A–O
bond
lattice
two
compounds
mainly
provides
sites,
but
B–O
promotes
deep
oxidation
methane
generated
hydrocarbons.
The
types
prone
to
be
associated
properties
A-site
metal
oxides.
Herein,
SrSnO3
perovskite
and
Nd2Sn2O7
pyrochlore
with
definite
structures
have
been
synthesized
using
a
hydrothermal
method,
the
differences
in
their
reactive
sites
for
oxidative
coupling
of
methane
(OCM)
are
investigated.
The
primary
products
C2
hydrocarbons
COx,
respectively.
selectivity
is
primarily
affected
by
basic
chemisorbed
oxygen
species
O22-.
For
pyrochlore,
key
factors
affecting
conversion
COx
acidic
(chemisorbed
weakly
bonded
lattice
oxygen).
directly
generated
through
intrinsic
vacancies,
whereas
those
vacancies
created
under
high-temperature
distortions.
tightness
stacking
between
[SnO6]
octahedra
main
factor
two
composite
oxides.
loose,
resulting
relatively
weak
Sn–O
bond
strength.
During
OCM
reaction,
prone
to
breakage,
abundant
vacancies.
Additionally,
influence
on
amount
more
important
than
that
which
attributed
fact
can
stabilize
catalyst
surface.
New Journal of Chemistry,
Год журнала:
2025,
Номер
49(6), С. 2382 - 2392
Опубликована: Янв. 1, 2025
Utilizing
O
2
in
developing
catalytic
direct
methane-to-methanol
conversion
process
offers
a
sustainable
route
to
harness
methane,
with
first-principles
insights
revealing
key
mechanistic
pathways
for
enhanced
efficiency.
Separations,
Год журнала:
2025,
Номер
12(4), С. 88 - 88
Опубликована: Апрель 4, 2025
In
the
context
of
sustainable
human
development
and
depletion
petroleum
resources,
lignin
has
received
widespread
attention
as
a
carbon-rich,
low-cost,
renewable
resource.
Owing
to
their
distinctive
physical
chemical
properties,
carbon
materials
are
extensively
applied
in
fields
adsorption
separation.
The
conversion
into
diverse
multifunctional
materials,
such
porous
carbon,
activated
fibers,
foams,
aerogels,
emerged
pivotal
strategy
for
high-value
utilization
lignin.
this
paper,
representative
examples
various
lignin-based
utilized
field
separation
over
past
decade
reviewed
categorized
according
type
preparation
methods
effects
described.
European Journal of Inorganic Chemistry,
Год журнала:
2024,
Номер
27(15)
Опубликована: Фев. 7, 2024
Abstract
Herein,
we
synthesised
a
series
of
nonstoichiometric
Nd−Ce−O
composite
oxides
with
fluorite
or
rare‐earth
C‐type
phase
structure
using
the
glycine
combustion
method
for
oxidative
coupling
methane
(OCM)
reaction.
As
amount
Nd
3+
increases,
oxygen
vacancies
in
this
gradually
increase,
leading
to
an
increasing
C
2
‐selective
species
O
−
generated
by
vacancies.
In
addition,
increase
,
number
moderate
basic
sites
on
catalyst
surface
also
improves,
another
significant
factor
affecting
OCM
reaction
performance
oxides.
0.9
Ce
0.1
1.55
possesses
optimal
low‐temperature
performance,
achieving
8.0
%
yield
at
450
°C
and
14.1
700
°C.
This
can
be
attributed
crystalline
which
exhibits
highest
abundance
vacancies,
selective
sites.
Methane,
Год журнала:
2024,
Номер
3(2), С. 359 - 379
Опубликована: Июнь 11, 2024
This
study
investigates
the
utilization
of
controlled
nanocatalysts
in
methane
conversion
reactions,
addressing
pressing
need
for
efficient
as
a
feedstock
valuable
chemicals
and
clean
energy.
The
methods
employed
include
comprehensive
review
recent
advancements
nanocatalyst
synthesis,
characterization,
application,
well
critical
analysis
underlying
mechanisms
controversies
activation
transformation.
main
findings
reveal
significant
progress
design
synthesis
nanocatalysts,
enabling
enhanced
activity,
selectivity,
stability
reactions.
Moreover,
highlights
importance
resolving
surrounding
metal–support
interactions
rational
catalyst
design.
Overall,
underscores
pivotal
role
nanotechnology
shaping
future
sustainable
energy
production,
providing
insights
guiding
research
directions
technological
developments
this
field.
