PtSn/Al2O3
and
PtSnSr/Al2O3
were
prepared
by
the
incipient
wetness
impregnation
method.
The
added
Sn
Sr
are
uniformly
distributed
on
surface
without
damaging
original
crystal
structure
texture
properties.
addition
of
not
only
changes
dispersion
Pt,
reduces
reduction
temperature
but
also
provides
electrons
to
increases
electron
cloud
density
deep
propylene
adsorption.
number
total
acid
sites
strong
sites,
generation
adverse
effects
carbon
deposition,
slows
down
deactivation
catalyst,
improves
selectivity
propylene.
Pt1.5Sn1.5Sr/Al2O3
showed
best
catalytic
reaction
performance
remained
stable
after
five
cycles
regeneration.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(36), С. 47773 - 47783
Опубликована: Авг. 28, 2024
Alumina-supported
PtSn
is
an
industrialized
catalyst
for
propane
dehydrogenation.
During
the
impregnation,
acidic
impregnation
solution
with
chloroplatinic
acid
as
a
precursor
inevitably
leads
to
partial
dissolution
of
surface
amphoteric
alumina
support
and
finally
varies
catalytic
performance.
Herein,
structure
evolution
active
phase,
induced
by
impregnated
solution,
was
studied
special
care.
According
diffused
double
layer
theory,
we
proposed
model
microgels
during
impregnation.
The
formed
in
suitable
acidity
on
catalysts
evolved
into
Al2O3-coated
oxidized
Pt
reprecipitation
drying
calcination.
covered
species
could
be
exposed
Ar+
sputtering
or
migrate
reduction
serve
sites
Noticeably,
Sn0
generated
when
pH
around
0.56,
which
solid
proof
unique
phase
alloy
present
SnOx
existing
Sn–Al2O3
support.
synthesized
exhibited
high
propylene
selectivity
(99.4%)
superior
stability
(kd
=
0.002
h–1).
This
study
provides
new
insight
precise
preparation
Pt/Sn–Al2O3
catalysts.
New Journal of Chemistry,
Год журнала:
2024,
Номер
48(27), С. 12412 - 12422
Опубликована: Янв. 1, 2024
The
K-affected
metal–acid
site
balance
of
the
Pt–K/Al
2
O
3
catalyst
is
investigated.
Increased
K
content
leads
to
loss
acid
sites
and
better
selectivity.
However,
it
also
decreased
Pt
active
sites,
reducing
activity.
Catalysis Communications,
Год журнала:
2023,
Номер
184, С. 106791 - 106791
Опубликована: Окт. 30, 2023
The
calcination
temperature
(400–600
°C)
of
NiO
was
modulated
and
then
the
support
effect
on
a
Pt-supported
catalyst
studied
for
base-free
aerobic
oxidation
5-hydroxymethylfurfural
to
2,5-furandicarboxylic
acid.
Various
characterizations
revealed
that
calcined
at
400
°C
showed
mesoporous
structure,
largest
specific
area
(89
m2
g−1),
abundant
reactive
oxygen
species
(55.1
mmol
g−1).
Therefore,
corresponding
Pt/Ni400c
enabled
100%
selectivity
FDCA
conversion
HMF
in
water
under
10
bar
O2,
100
12
h.
role
different
transforming
intermediates
elucidated.
Energy & Fuels,
Год журнала:
2024,
Номер
38(9), С. 8072 - 8083
Опубликована: Апрель 18, 2024
Pt/HSSZ-13
with
0.5–3
wt
%
Pt
load
and
PtCu/HSSZ-13
1–7
Cu
were
prepared
by
the
initial
wetness
impregnation
method.
Without
compromising
original
crystal
structure
surface
texture
characteristics,
doped
are
dispersed
uniformly
throughout
surface.
The
Si/Al
molar
ratio
affected
not
only
of
but
also
number
acid
sites
on
catalyst
appropriate
addition
significantly
increased
dispersion
Pt.
provided
electrons
to
Pt,
electron
cloud
density
then
reduced
adsorption
propylene
improved
selectivity
propylene.
can
decrease
acidic
surface,
thus
slowing
deactivation
rate
amount
carbon
deposition
during
reaction.
1.0Pt3.0Cu/HSSZ-13(40)
had
a
small
strong
(3.89
μmol/g)
showed
best
propane
conversion
(73.95%),
excellent
(97.60%),
lowest
constant
(0.33
h–1),
good
regeneration
robustness.
