Nano Letters,
Год журнала:
2023,
Номер
23(20), С. 9367 - 9374
Опубликована: Окт. 9, 2023
CuOx/C
catalysts
have
been
used
in
the
selective
catalytic
reduction
of
NOx
because
exceptional
low-temperature
denitration
(de-NOx)
activity.
A
fundamental
understanding
reaction
between
CuO
and
C
is
critical
for
controlling
component
thus
optimizing
performance.
In
this
study,
a
transmission
electron
microscope
equipped
with
an
situ
heating
device
was
utilized
to
investigate
atomic-scale
C.
We
report
two
mechanisms
relying
on
volume
ratio
CuO:
(1)
The
from
Cu2O
(when
<
∼31%);
(2)
into
polycrystalline
Cu
>
∼34%).
atomistic
pathway
can
be
well
interpreted
by
considering
diffusion
O
vacancy
through
first-principle
calculations.
exploration
CuO/C
offers
ample
prospects
design
industrial
de-NOx
future.
Energy & Fuels,
Год журнала:
2024,
Номер
38(7), С. 6269 - 6280
Опубликована: Март 21, 2024
Various
amounts
of
W
were
modified
on
Ce0.4ZrOx
catalysts
via
a
wet
impregnation
method.
Among
them,
the
W0.1/Ce0.4ZrOx
catalyst
with
W/Zr
molar
ratio
0.1
exhibited
much
better
catalytic
activity
and
good
SO2
resistance.
Its
active
temperature
window
corresponding
to
80%
NOx
conversion
was
as
wide
210–450
°C.
It
could
maintain
high
efficiency
(>96%)
after
treatment
in
100
ppm
atmosphere
for
18
h.
Characterization
results
indicated
that
element
successfully
entered
lattice
Ce–Zr
solid
solution
partially
replacing
Zr
atoms.
This
led
an
electron
redistribution
surface
catalyst,
which
beneficial
form
Ce3+
oxygen
vacancies,
thus
significantly
improving
redox
performance.
In
addition,
WOx
also
enhanced
acidity
conducive
adsorption
NH3.
situ
diffuse
reflectance
infrared
Fourier
transform
spectroscopy
(DRIFTS)
confirmed
nitrate
species
adsorbed
be
activated
by
W,
reacting
NH3
efficiently.
The
reaction
pathway
over
followed
both
Eley–Rideal
Langmuir–Hinshelwood
mechanisms
at
300
enhancement
effect
modification
resistance
mainly
ascribed
balance
between
acidic
properties.
SAE technical papers on CD-ROM/SAE technical paper series,
Год журнала:
2025,
Номер
1
Опубликована: Апрель 1, 2025
<div
class="section
abstract"><div
class="htmlview
paragraph">Selective
catalytic
oxidation/reduction
catalysts
coated
on
diesel
particulate
filters
(SDPF)
are
an
important
technology
route
to
meet
next-stage
emission
regulations.
The
previous
research
of
the
group
showed
that
compared
with
SDPF
Cu-SSZ-13,
novel
selective
oxidation-selective
reduction
(SCO-SCR)
catalyst,
which
combined
MnO<sub>2</sub>-CeO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>
and
can
simultaneously
improve
NOx
soot
oxidation
performance.
Catalyst
coating
strategy
is
parameter
affecting
performance
SDPF.
In
this
study,
effects
different
strategies
SCO-SCR
(C25,
C50,
C75,
C100)
in
were
investigated.
results
show
that,
as
inlet
gas
temperature
increases,
NO
emissions
first
decrease
then
increase,
conversion
efficiency
increases
decreases,
rich-NO<sub>2</sub>
area,
NH<sub>3</sub>
rate,
N<sub>2</sub>O,
CO,
CO<sub>2</sub>
emissions,
pressure
drop
increase.
By
expanding
catalyst
efficiency,
NO<sub>2</sub>,
filter
wall
all
increased,
cake
layer
decreased.
When
450
°C,
there
areas
at
both
front
end
rear
C100.
25%
area
increase
regeneration
efficiency.
While
impact
N<sub>2</sub>O
generation
small.
Still,
it
will
lead
excessive
NO<sub>2</sub>
emissions.
increased
magnitude
decease
expands.</div></div>
