Indonesian Journal of Chemistry,
Journal Year:
2023,
Volume and Issue:
23(6), P. 1584 - 1584
Published: Dec. 6, 2023
The
rapid
development
of
the
aquaculture
industry
has
contributed
to
high
amount
nutrients
in
wastewater
that
subsequently
led
eutrophication
and
deterioration
water
quality.
Aquaculture
consists
uneaten
fish
feed,
fecal
other
excretion
or
residue
chemicals
used.
Thus,
this
study
aimed
evaluate
performance
hybrid
coagulants
Moringa
oleifera
(MO)
copperas
for
treatment.
In
present
study,
different
formulations
MO
were
explored
coagulation
treatment
using
a
jar
test
experiment.
FTIR
SEM
analysis
are
used
determine
morphology
surface
MO.
This
focuses
on
effect
coagulant
aids
formulation,
dosage,
initial
pH
time
turbidity
ammonia
removal
wastewater.
finding
shows
highest
was
obtained
with
use
80%
20%
at
condition
6
20
min
time,
percentage
66%
91%,
respectively.
isotherm
80:20
is
well
described
Freundlich
model
which
describes
heterogeneity.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(12), P. 14694 - 14703
Published: March 13, 2024
Improving
the
N2
selectivity
is
always
a
great
challenge
for
selective
catalytic
oxidation
of
ammonia
(NH3–SCO)
over
noble-metal-based
(especially
Pt)
catalysts.
In
this
work,
Cu
as
an
efficient
promoter
was
introduced
into
Pt/SSZ-13
catalyst
to
significantly
improve
NH3–SCO
reaction.
A
PtCu
alloy
formed
in
PtCu/SSZ-13
catalyst,
confirmed
by
X-ray
diffraction,
transmission
electron
microscopy,
energy
dispersive
spectrometry
mapping,
and
absorption
spectroscopy
results.
As
indicated
photoelectron
analysis,
Pt
species
alloyed
nanoparticle
mainly
present
electron-rich
state
on
PtCu/SSZ-13,
while
electron-deficient
isolated
Cu2+
were
both
surface
PtCu/SSZ-13.
Due
such
unique
structure
with
altered
state,
remarkably
improved,
activity
kept
comparable
that
Pt/SSZ-13.
The
reaction
path
changed
from
NH
mechanism
internal
reduction
mechanisms
which
considered
main
reason
enhanced
selectivity.
This
work
provides
new
route
synthesize
catalysts
optimizing
NH3
slip
control
diesel
exhaust
purification.
Inorganic Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 13, 2025
The
emission
of
NH3
has
been
reported
to
pose
a
serious
threat
both
human
health
and
the
environment.
To
efficiently
eliminate
NH3,
catalysts
for
selective
catalytic
oxidation
(NH3–SCO)
have
intensively
studied.
Fe2O3-based
were
found
exhibit
superior
activity;
however,
low
N2
selectivity
made
it
less
attractive
in
practical
applications.
In
this
work,
aimed
at
improving
on
catalysts,
simple
SiO2
doping
strategy
was
proposed.
Although
activity
showed
almost
no
change
Fe2O3
after
doping,
significantly
improved.
Systematic
characterizations
revealed
that
could
increase
specific
surface
area
Fe2O3,
strong
interaction
Fe–O–Si
formed
Fe2O3–SiO2
mixed
oxide
catalysts.
Furthermore,
abundant
Brønsted
acid
sites
due
facile
hydrolysis
structure
into
Si–OH
Fe–OH.
weaken
redox
ability
facilitate
reaction
through
an
internal
SCR
(i-SCR)
pathway,
thus
achieving
selectivity.
This
work
can
provide
new
insights
constructing
efficient
NH3–SCO
with
high
Catalysts,
Journal Year:
2025,
Volume and Issue:
15(3), P. 196 - 196
Published: Feb. 20, 2025
Ammonia
has
attracted
much
interest
as
a
potential
green
and
renewable
hydrogen
carrier
or
energy
vector.
Compared
to
hydrogen,
ammonia
offers
several
advantages.
For
example,
significantly
higher
density
can
be
liquefied
at
room
temperature
moderate
pressure
of
8
bars.
While
cracked
supply
it
is
also
possible
convert
directly
into
high-temperature
solid
oxide
fuel
cells
(SOFCs)
generate
electricity.
The
Ship-FC
project
aims
install
an
ammonia-fed
2MW
SOFC
system
on
board
the
vessel
Viking
demonstrate
feasibility
zero
CO2
emission
shipping.
this
NH3
system,
catalytic
afterburner
required
remove
present
in
off-gas
recover
heat.
current
study
analysed
effects
different
catalyst
supports,
with
focus
NOX
formation
through
combustion
surrogate.
investigated
performance
catalysts
based
active
metals,
platinum
iridium,
well
Al2O3,
SiO2,
TiO2.
results
were
correlated
characterisation
data
TPD
results.
investigations
showed
that
was
clearly
affected
by
nature
support.
highest
selectivity
towards
observed
for
followed
lowest
This
trend
evident
supported
iridium
samples
exclusively
containing
N2O
opposite
(TiO2
>
SiO2
Al2O3)
both
presence
absence
iridium.
Catalysts,
Journal Year:
2025,
Volume and Issue:
15(3), P. 204 - 204
Published: Feb. 21, 2025
Ammonia
(NH3)
emissions
from
mobile
sources
pose
significant
environmental
challenges,
contributing
to
air
pollution,
ecosystem
degradation,
and
climate
change.
The
selective
catalytic
oxidation
of
NH3
(NH3-SCO)
offers
a
sustainable
solution
by
converting
into
nitrogen
water,
yet
designing
catalysts
that
balance
high
efficiency,
selectivity,
stability
under
operational
conditions
remains
critical
challenge.
This
review
provides
comprehensive
overview
zeolite-based
catalysts,
renowned
for
their
surface
area,
tunable
pore
structures,
exceptional
hydrothermal
stability,
which
make
them
ideal
NH3-SCO
applications.
synthesizes
recent
advancements
in
catalyst
design,
emphasizing
innovative
architecture,
the
role
zeolite
frameworks
active
site
dispersion,
strategies
optimizing
architectures.
Key
insights
include
an
enhanced
understanding
reaction
mechanisms,
progress
mitigating
deactivation
caused
poisoning
sintering,
development
bimetallic
core-shell
improve
performance
durability.
Current
limitations,
including
sensitivity
environments
scalability
issues,
are
critically
analyzed,
potential
overcoming
these
barriers
proposed.
highlights
state-of-the-art
catalysis,
offering
valuable
fundamental
applied
aspects
design.
findings
presented
here
provide
roadmap
future
innovations
paving
way
more
efficient
robust
solutions
ammonia
emission
control.
