Molecules,
Journal Year:
2024,
Volume and Issue:
29(18), P. 4506 - 4506
Published: Sept. 23, 2024
Selective
catalytic
reduction
of
nitrogen
oxides
(NOx)
with
ammonia
(NH3-SCR)
has
been
implemented
in
response
to
the
regulation
NOx
emissions
from
stationary
and
mobile
sources
above
300
°C.
However,
development
NH3-SCR
catalysts
active
at
low
temperatures
below
200
°C
is
still
needed
improve
energy
efficiency
cope
various
fuels.
In
this
review
article,
recent
reports
on
low-temperature
are
systematically
summarized.
The
redox
property
as
well
surface
acidity
two
main
factors
that
affect
activity.
strong
beneficial
for
activity
but
responsible
N2O
formation.
multiple
electron
transfer
system
more
plausible
controlling
properties.
H2O
SOx,
which
often
found
flue
gas,
have
a
detrimental
effect
activity,
especially
temperatures.
competitive
adsorption
can
be
minimized
by
enhancing
hydrophobic
catalyst.
Various
strategies
resistance
SOx
poisoning
also
discussed.
Chemical Science,
Journal Year:
2024,
Volume and Issue:
15(24), P. 9026 - 9046
Published: Jan. 1, 2024
The
excessive
production
of
nitrogen
oxides
(NO
x
)
from
energy
production,
agricultural
activities,
transportation,
and
other
human
activities
remains
a
pressing
issue
in
atmospheric
environment
management.
The Innovation Materials,
Journal Year:
2024,
Volume and Issue:
unknown, P. 100090 - 100090
Published: Jan. 1, 2024
<p>Anthropogenic
climate
and
environmental
changes
increasingly
threaten
the
sustainability
of
life
on
Earth,
hindering
sustainable
development
human
societies.
These
detrimental
ecological
are
driven
by
activities
that
have
elevated
atmospheric
levels
greenhouse
gases
toxic
substances,
increased
inorganic
organic
pollutants
in
water
bodies,
led
to
accumulation
solid
waste
soils.
Over
next
two
three
decades,
impacts
change,
pollution,
soil
contamination
expected
intensify,
posing
increasing
risks
health
global
stability.
Considering
these
trends,
it
is
essential
implement
robust
mitigation
adaptation
strategies.
This
paper
analyzes
pollution
problems
from
perspectives
atmospheric,
water,
contamination.
It
summarizes
current
research
heterogeneous
catalysis
for
treating
gaseous,
liquid,
phases,
with
an
emphasis
key
challenges
applying
catalytic
conversion
technologies
cost-effective
industrial
settings.
Finally,
strategies
mitigating
via
discussed
material
flow,
energy
data
flow.
aims
offer
scientific
insights
enhance
future
practice
remediation.</p>
ACS Catalysis,
Journal Year:
2023,
Volume and Issue:
13(23), P. 15481 - 15492
Published: Nov. 16, 2023
CeO2-based
oxides,
with
promising
redox
properties,
exhibit
application
potential
for
the
selective
catalytic
reduction
(SCR)
of
nitrogen
oxide
(NOx)
NH3
(NH3-SCR).
Despite
decades
research,
underlying
mechanisms
governing
SCR
activity
remain
unclear,
and
paths
fast
(Fast_SCR)
standard
(Std_SCR)
on
CeO2
surfaces
are
still
under
debate.
Understanding
complete
reaction
mechanism
is
crucial
design
synthesis
efficient
catalysts.
We
perform
density
functional
theory
(DFT)
simulations,
synthesize
model
catalysts
in
situ
spectroscopy
experiments
(in
drifts,
Raman,
NAP-XPS,
EPR)
evaluation
to
reveal
NH3-SCR
over
CeO2.
find
that
Std_SCR
fast-SCR
share
same
NO
path
but
go
through
two
different
adsorbed-hydrogen
(H*)
removal
processes.
For
reaction,
dissociation
NH2*
H*
catalyzed
by
coupled
[O*
+
Ovac]
species.
The
then
combines
generate
NH2NO
active
intermediate,
which
further
dissociates
N2
H2O.
In
Fast_SCR
process,
NO2
reacts
*NH3
H2O
NH2NO.
Std_SCR,
species
O*
consumed
removal.
Our
experimental–theoretical
joint
study
provides
principles
based
atomic-level
understanding
mechanisms.
