Materials,
Год журнала:
2024,
Номер
17(24), С. 6069 - 6069
Опубликована: Дек. 12, 2024
Rice
husk,
a
byproduct
of
rice
production,
poses
significant
environmental
challenges
due
to
disposal
issues,
while
the
emission
volatile
organic
compounds
into
atmosphere
further
exacerbates
these
concerns.
This
study
addresses
both
problems
by
exploring
potential
texturally
enhanced
SiO2,
derived
from
Uruguayan
as
catalytic
support
for
manganese
oxides
in
combustion
compounds.
SiO2
was
synthesized
husk
ash
using
sustainable,
acid-free
pretreatment
method,
yielding
notably
high
silica
purity
96.5%—a
level
comparable
or
exceeding
previously
reported
values,
highlighting
quality
inherent
husk.
The
activity
evaluated
acetone
model
compound,
achieving
up
90%
conversion
with
30
wt.%
oxide
at
300
°C,
CO2
primary
product.
Furthermore,
24
h
stability
test
demonstrated
consistent
performance,
maintaining
rate
around
95.6
±
2.5%.
These
findings
suggest
that
high-purity
its
sustainability
benefits,
offers
an
effective
solution
removal
when
supporting
active
phase
such
oxides,
addressing
and
compound
emissions.
Catalysts,
Год журнала:
2023,
Номер
13(12), С. 1491 - 1491
Опубликована: Дек. 2, 2023
Catalytic
ozonation,
with
enhanced
efficiency
and
reduced
byproduct
formation
at
lower
temperatures,
proved
to
be
efficient
in
ethyl
acetate
(EA)
degradation.
In
this
work,
MMn2O4
(M
=
Cu,
Co,
Ni,
Mg)
catalysts
were
prepared
via
a
redox-precipitation
method
explore
the
catalytic
ozonation
mechanism
of
EA.
Among
all
catalysts,
CuMn
exhibited
superior
activity
120
°C,
achieving
nearly
100%
EA
conversion
above
90%
CO2
selectivity
an
O3/EA
molar
ratio
10.
Many
characterizations
conducted,
such
as
SEM,
BET
XPS,
for
revealing
properties
catalysts.
Plentiful
active
sites,
abundant
oxygen
vacancies,
more
acid
sites
higher
reduction
ability
contributed
excellent
performance
CuMn.
Moreover,
addition
NO
induced
degree
inhibition
due
its
competition
ozone.
H2O
had
little
effect
on
CuMn,
could
reach
stable
platform
~89%
even
5.0
vol.%
H2O.
The
presence
SO2
usually
caused
catalyst
deactivation.
However,
gradually
recover
once
was
discontinued
reactivation
A
detailed
reaction
proposed
situ
DRIFTS
measurements
DFT
calculations.
Abstract
Bimetallic
oxide
catalysts
derived
from
zeolitic
imidazolate
frameworks
(ZIFs)
have
good
catalytic
oxidation
activity,
but
their
application
is
limited
because
the
powder
not
conducive
to
industrial
production.
In
this
study,
CoCeO
x
/cordierite
monolithic
ZIFs
were
prepared
by
a
simple
impregnation
method.
Firstly,
phase
transition
of
Co‐ZIF
was
induced
in
ethanol
solution
adding
excessive
Ce(NO
3
)
.
Subsequently,
tannic
acid
(TA)
used
chelate
excess
metal
on
surface
expose
more
active
sites.
Meanwhile,
TA
staying
precursor
could
also
prevent
accumulation
Ce
at
high
temperatures.
After
activity
test,
showed
excellent
for
o
‐xylene
with
T
90
295
°C.
The
mechanical
stability
catalyst
tested
ultrasonic
vibration
addition,
we
investigated
influence
factors
such
as
cycles
and
treatment
time
physical
chemical
properties.
This
paper
provides
new
idea
preparing
ZIFs.
Materials,
Год журнала:
2024,
Номер
17(24), С. 6069 - 6069
Опубликована: Дек. 12, 2024
Rice
husk,
a
byproduct
of
rice
production,
poses
significant
environmental
challenges
due
to
disposal
issues,
while
the
emission
volatile
organic
compounds
into
atmosphere
further
exacerbates
these
concerns.
This
study
addresses
both
problems
by
exploring
potential
texturally
enhanced
SiO2,
derived
from
Uruguayan
as
catalytic
support
for
manganese
oxides
in
combustion
compounds.
SiO2
was
synthesized
husk
ash
using
sustainable,
acid-free
pretreatment
method,
yielding
notably
high
silica
purity
96.5%—a
level
comparable
or
exceeding
previously
reported
values,
highlighting
quality
inherent
husk.
The
activity
evaluated
acetone
model
compound,
achieving
up
90%
conversion
with
30
wt.%
oxide
at
300
°C,
CO2
primary
product.
Furthermore,
24
h
stability
test
demonstrated
consistent
performance,
maintaining
rate
around
95.6
±
2.5%.
These
findings
suggest
that
high-purity
its
sustainability
benefits,
offers
an
effective
solution
removal
when
supporting
active
phase
such
oxides,
addressing
and
compound
emissions.