ACS Catalysis,
Journal Year:
2022,
Volume and Issue:
12(21), P. 13506 - 13512
Published: Oct. 20, 2022
Structural
evolution
of
heterogeneous
catalysts
often
occurs
during
catalytic
reactions.
In
this
contribution,
the
structural
a
PtMn/SiO2
catalyst
reverse
water-gas
shift
(RWGS)
reaction
was
investigated
using
detailed
spectroscopic
characterizations.
The
results
show
that
Mn
atoms
on
PtMn
nanoparticle
surface
were
partially
removed
RWGS
reaction,
which
increases
ratio
Pt
sites
with
lower
coordination
number
surface,
leading
to
10-fold
increase
rate
in
n-C4H10
dehydrogenation
from
1.85
21.93
mol
gPt–1
h–1
and
decrease
apparent
activation
energy
50
33
kJ
mol–1.
This
work
provides
dimension
improving
performance
alkane
over
Pt-based
bimetallic
through
CO2
hydrogenation.
Journal of the American Chemical Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 11, 2025
Propene,
used
on
a
large
scale
to
manufacture
polypropylene
and
several
commodity
chemicals,
is
increasingly
produced
by
catalytic
propane
dehydrogenation
(PDH).
Atomically
dispersed
Pt
has
emerged
as
promising
candidate
catalyst
for
PDH;
however,
stabilizing
atomically
at
high
temperatures
challenging.
Here,
we
demonstrate
the
use
of
dealuminated
zeolite
beta
with
Fe
content
host
isolated
Pt,
which
anchored
strongly
support
Pt-Fe
bonds.
The
sites
exhibit
PDH
performance,
including
apparent
forward
rate
coefficient
propene
formation
(404.8-26.4
mol
propene/mol
Pt·bar·s)
selectivity
(≥96%)
823
K
in
presence
H2.
Kinetics
data
characterizing
range
loadings
show
that
catalyzes
rates
independent
H2
partial
pressure,
whereas
metallic
clusters,
formed
loadings,
catalyze
reaction
slightly
negative
dependence
pressure.
shift
speciation
loading,
confirmed
infrared
spectroscopy
adsorbed
CO,
X-ray
absorption
spectroscopy,
high-angle
angular
dark
field
scanning
transmission
electron
microscopy,
suggests
observed
change
kinetics
dispersion
consequence
mechanism.
