Photothermal
synergistic
low-temperature
catalytic
volatile
organic
compounds
(VOCs)
degradation
has
an
advantage
on
energy
efficient
and
reduce
carbon
emissions.
Herein,
impregnation
-
pyrolysis
oxidation
strategy
was
adopted
to
synthesis
Pd/Mn3O4
heterojunction
catalyst.
Under
photothermal
condition,
0.60Pd/Mn3O4
catalyst
exhibited
excellent
activity
for
propane
total
oxidation,
with
a
T90
value
of
219.1
°C,
which
115.3
°C
lower
than
Mn3O4.
Enhancement
effect
the
structure
synergy
detected
by
various
characterization
density
functional
theory
calculation.
The
presence
Pd
species
enhanced
reducibility
Meanwhile,
O2
molecules
were
more
easily
activated
at
site
overflow
surface
Mn3O4
reaction.
Besides,
formation
p-n
junction
between
in
promoted
charge
separation
migration
carriers,
boosted
generation
oxygen
free
radical,
resulting
significant
improvement
activity.
Overall,
this
study
provided
new
deep
insight
constructing
enhance
performance
VOC
elimination.
Environmental Science & Technology,
Journal Year:
2024,
Volume and Issue:
58(43), P. 19385 - 19396
Published: Oct. 14, 2024
In
contrast
to
previous
defect
engineering
methods,
the
preparation
of
amorphous
materials
can
obtain
abundant
sites
through
a
simple
way,
which
is
expected
effectively
degrade
Volatile
Organic
Compounds
(VOCs)
under
milder
conditions.
However,
in-depth
and
systematic
studies
in
this
area
are
still
lacking.
Novel
types
CeMnx
catalysts
with
defects
were
prepared
hydrothermal
synthesis
used
for
Cl-VOCs
catalysis
first
time.
Experimental
characterizations
DFT
calculations
proved
that
Ce
doping
induced
MnO2
lattice
distortion,
led
transformation
into
an
structure
formation
sites.
It
was
observed
CeMn0.16
able
eliminate
chlorobenzene
(CB)
at
200
°C,
CO2
yields
selectivity
inorganic
chlorine
significantly
higher
than
MnO2.
The
18O
isotope
kinetic
experiments
revealed
interfacial
reaction
process
followed
MVK
mechanism.
large
number
oxygen
vacancies
accelerated
migration
from
interior
exterior,
enhancing
ability
trap
gas-phase
oxygen.
Mn4+
acted
as
main
active
center
participate
CB
catalysis,
resulting
reactive
species
(ROS)
Mn3+-[O2–]-Ce4+
further
entire
oxidation
cycle.
