ACS Catalysis,
Journal Year:
2024,
Volume and Issue:
14(22), P. 17148 - 17158
Published: Nov. 6, 2024
The
direct
conversion
of
carbon
dioxide
(CO2)
into
methanol
(CH3OH)
via
low-temperature
hydrogenation
is
crucial
for
recycling
anthropogenic
CO2
emissions
and
producing
fuels
or
high
value
chemicals.
Nevertheless,
it
continues
to
be
a
great
challenge
due
the
trade-off
between
selectivity
catalytic
activity.
For
hydrogenation,
In2O3
catalysts
are
known
their
CH3OH
selectivity.
Subsequent
studies
explored
depositing
metals
on
enhance
conversion.
Despite
extensive
research
metal
(M)
supported
catalysts,
role
In–M
alloys
M/In2O3
interfaces
in
activation
remains
unclear.
In
this
work,
we
have
examined
behavior
In/Au(111)
InOx/Au(111)
inverse
systems
during
using
synchrotron-based
ambient-pressure
X-ray
photoelectron
spectroscopy
(AP-XPS)
tests
batch
reactor.
Indium
forms
with
Au(111)
after
deposition.
In–Au(111)
display
reactivity
toward
can
dissociate
molecule
at
room
temperature
generate
InOx
nanostructures.
At
very
low
coverages
(≤0.05
ML),
nanostructures
not
stable
under
conditions
active
produces
mainly
CO
little
methanol.
An
increase
indium
coverage
0.3
ML
led
conditions.
These
displayed
(∼80%)
production
an
activity
that
was
least
10
times
larger
than
plain
Cu(111)
Cu/ZnO(0001̅)
benchmark
catalysts.
results
AP-XPS
show
methoxy
intermediates.
Inverse
oxide/metal
containing
open
up
possibility
improving
→
processes
associated
control
environmental
pollution
ACS Catalysis,
Journal Year:
2024,
Volume and Issue:
15(1), P. 23 - 33
Published: Dec. 12, 2024
Indium–palladium
intermetallic
catalysts
have
shown
great
potential
for
CO2
hydrogenation
to
methanol.
A
deep
understanding
of
the
synergistic
relationship
between
various
components
is
key
developing
efficient
indium–palladium
catalysts.
Here,
we
rationally
designed
a
series
with
In–Pd
ratios
and
found
that
InPd(2:1)/m-ZrO2
demonstrated
highest
reactivity
(5.1
mmol/gcat/h),
maintaining
this
performance
even
after
70
h
stability
testing
at
270
°C
4
MPa.
This
impressive
attributed
formation
stable
compound
chemical
formula
In3Pd2
which
close
In2O3
phase
during
reduction
process.
In
situ
diffuse
reflectance
infrared
Fourier
transform
spectroscopy
(DRIFTS)
density
functional
theory
(DFT)
calculations
were
further
conducted
confirm
formate
path
more
favorable
Adsorption
energy
reactants
determine
roles
In2O3:
tends
adsorb
activate
CO2,
while
has
an
advantage
dissociation
H2,
could
compensate
insufficient
ability
In2O3,
thereby
promoting
reaction
intermediates.
These
findings
highlight
crucial
role
compounds
in
selective
Low-temperature
catalytic
oxidation
has
emerged
as
one
of
the
most
effective
methods
for
removing
carbon
monoxide
due
to
its
economic
feasibility.
Copper-based
(Cu-based)
catalysts
are
increasingly
regarded
viable
alternatives
noble
metal
catalysts.
While
incorporation
indium
(In)
into
Cu-based
gained
popularity,
impact
In
oxide
(In2O3)
phase
on
catalyst
performance
remains
unclear.
this
study,
we
prepared
two
different
In2O3
with
cubic
(cb)
and
rhombohedral
(rh)
phases.
Cu
is
supported
via
impregnation
method.
The
Cu/In2O3
a
exhibited
higher
CO
activity
(T90
=
122
°C).
primary
reason
enhanced
that
support
promoted
generation
surface
Cu+
species.
Based
in
situ
DRIFTS
results,
species
Cu+-CO
serve
active
sites
intermediates,
respectively,
reaction.
