The Journal of Physical Chemistry C,
Journal Year:
2023,
Volume and Issue:
127(43), P. 21047 - 21062
Published: Oct. 20, 2023
Fe-exchanged
TiO2
substances
("FeTn")
were
synthesized
by
subliming
a
solid
mixture
of
surface-hydroxylated
("HT")
with
salt
iron(II)
chloride
at
200–400
°C
to
utilize
them
as
supports
for
dramatically
decreasing
the
formation
N2O
in
reduction
NO
NH3
over
supported
V2O5
catalysts.
All
FeTns
did
not
undergo
incorporation
Fe
cations
into
lattice
HT,
structural
transformation,
or
any
oxygen-containing
iron
complexes.
Unique
bands
near
2286
cm–1
η1-N2O
adsorbed
on
disclosed
presence
isolated
Fe2+
cations,
consistent
their
2p3/2
main
and
satellite
structures.
FeTn-supported
systems
exhibited
noticeable
decrease
production
temperatures
≥350
°C,
70–80%,
compared
that
an
HT-supported
V2O5.
Thus,
such
bode
well
use
deNOx
catalysis.
The
effective
elimination
of
N2O
from
automobile
exhaust
at
low
temperatures
poses
significant
challenges.
Compared
to
other
materials,
supported
RhOx
catalysts
exhibit
high
decomposition
activities,
even
in
the
presence
O2,
CO2,
and
H2O.
Metal
additives
can
enhance
low-temperature
activities
over
catalysts;
however,
enhancement
mechanism
active
sites
require
further
investigation.
In
this
study,
we
demonstrate
activity
a
monoclinic
ZrO2-supported
Rh
catalyst
[Rh(1)/ZrO2]
with
Ir
addition
+
O2
CO2
promotional
effect
on
Rh(1)–Ir(1)/ZrO2
(Rh
=
1
wt
%
%)
were
investigated
by
kinetic
studies
situ
spectroscopic
methods,
including
X-ray
absorption
spectroscopy,
ambient-pressure
photoelectron
ultraviolet–visible
spectroscopy.
These
results
indicate
that
both
surface
species
for
catalytic
temperatures,
augmentation
promoted
desorption
gaseous
which
are
regarded
as
key
steps
decomposition.
Journal of the American Chemical Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 28, 2025
Fe-exchanged
zeolites
are
heterogeneous
catalysts
that
can
potentially
ensure
simultaneous
conversion
of
nitrous
oxide
(N2O)
and
nitric
(NO)
using
ammonia
(NH3)
as
a
selective
reducing
agent
through
their
catalytic
reduction
reaction
(N2O-NO-SCR).
In
this
study,
we
rationalize
the
origin
beneficial
effect
N2O
on
NO
by
combining
experiments
with
ex
situ
characterization
in
situ/operando
X-ray
absorption
spectroscopy
(XAS)
infrared
diffuse
reflectance
mode
(DRIFTS)
series
Fe-ZSM-5
where
attempted
to
control
Fe
speciation
at
constant
content.
The
activity
data
revealed
promote
different
temperatures
extents.
This
behavior
was
found
be
related
NO-mediated
decomposition
reaction,
which
ensures
oxidative
transformation
thus
sustains
N2O-NO-SCR
chemistry.
oxidation
is
turn
determined
processes
activation
adsorption,
function
likely
catalyzed
minority
isolated
Fe2+
sites
coordinated
cationic
environments.
agreement,
concentrations
species
able
activate
(Cα)
coordinate
(CFe-NO)
decrease
an
increasing
degree
agglomeration
govern
especially
promotion
induced
dual-site
mechanism.
Maximization
concentration
both
therefore
essential
design
highest
toward
reaction.
ACS Catalysis,
Journal Year:
2023,
Volume and Issue:
13(19), P. 12983 - 12993
Published: Sept. 20, 2023
Catalytic
decomposition
of
N2O
into
N2
and
O2
is
one
the
most
important
techniques
for
removing
from
atmosphere
to
curb
global
warming.
Supported
RhOx
catalysts
are
known
show
high
efficiency
decomposition,
even
in
presence
O2,
compared
with
other
materials,
such
as
supported
metal
oxides
Fe-based
zeolite
catalysts.
In
this
study,
addition
Ag
was
found
enhance
an
Al2O3-supported
catalyst
(RhOx/Al2O3)
decomposition.
The
promotional
effect
investigated
using
various
operando
spectroscopic
methods,
including
X-ray
absorption
spectroscopy,
diffuse
reflectance
UV–vis
spectroscopy
(DR
UV–vis),
ambient-pressure
photoelectron
kinetic
studies.
results
demonstrated
that
enhanced
catalytic
by
enhancing
thermal
reduction
Rh
oxide,
which
identified
rate-determining
step,
especially
at
low
temperatures.
