JST (Jurnal Sains dan Teknologi),
Год журнала:
2024,
Номер
13(2), С. 205 - 216
Опубликована: Июль 25, 2024
Gas
CO2
dapat
mengakibatkan
pemanasan
global
dan
pada
kadar
tertentu
mempengaruhi
kesehatan
manusia.
Dalam
rangka
untuk
menjaga
di
lingkungan
dalam
kondisi
normal,
maka
penelitian
ini
mencoba
mengkonversi
menjadi
precipitated
calcium
carbonate
(PCC),
yaitu
dengan
mengontakan
gas
Ca(OH)2.
Tujuan
dari
adalah
mempelajari
menganalisa
pengaruh
kecepatan
pengadukan,
tekanan
sistem
reaksi,
waktu
interaksi
pembuatan
Precipitated
Calcium
Carbonate
(PCC)
menggunakan
reaktor
semi
batch.
Penelitian
dilakukan
hidrostatis
980-9800
Pa,
400
500
rpm,
laju
alir
2
liter/menit,
15
-
60
menit.
Hasil
menunjukan
bahwa
interaksi,
pengadukan
mempunyai
terhadap
reaksi
antara
Ca(OH)2,
produk
PCC
yang
dihasilkan.
Kondisi
operasi
optimum
diperoleh
9800
menit
massa
dihasilkan
sebesar
7,99
gram.
ACS Catalysis,
Год журнала:
2024,
Номер
14(21), С. 16434 - 16458
Опубликована: Окт. 23, 2024
Thermo-catalytic
CO2
hydrogenation
to
high-value
oxygenates
has
been
regarded
as
one
of
the
most
powerful
strategies
that
can
potentially
alleviate
excessive
emissions.
However,
due
high
chemical
stability
and
variability
pathways,
it
is
still
challenging
achieve
highly
active
selective
hydrogenation.
Single
atom
catalysts
(SACs)
with
ultrahigh
metal
utilization
efficiency
extraordinary
electronic
features
have
displayed
growing
importance
for
thermo-catalytic
multiple
developed
improve
performances.
Here,
we
review
breakthroughs
in
developing
SACs
efficient
toward
common
(CO,
HCOOH,
CH3OH,
CH3CH2OH)
following
order:
first,
an
analysis
reaction
mechanisms
thermodynamics
challenges
reactions;
second,
a
summary
SAs
designed
by
dividing
them
into
two
categories
single-
dual-sites;
third,
discussion
support
effects
focus
on
approaches
regulating
strong
metal–support
interaction
(MSI).
Summarily,
current
future
perspectives
develop
higher-performance
are
presented.
We
expect
this
bring
more
design
inspiration
trigger
innovation
catalytic
evolution
materials
eventually
benefit
achievement
carbon-neutrality
goal.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 29, 2024
Abstract
The
location
control
of
single
atoms
relative
to
supports
is
challenging
for
single‐atom
catalysts,
leading
a
large
proportion
inaccessible
buried
under
supports.
Herein,
“sequential
thermal
transition”
strategy
developed
afford
Pt
preferentially
dispersed
on
the
outer
surface
TiO
2
.
Specifically,
Ti‐MOF
confining
nanoparticles
converted
NPs
and
composite
coated
by
carbon
(Pt
&TiO
@C‐800)
at
800
°C
in
N
Subsequent
thermal‐driven
atomization
600
air
produce
decorated
1
/TiO
‐600).
resulting
‐600
exhibits
superior
p
‐chloroaniline
(
‐CAN)
selectivity
(99
%)
‐400
(45
much
better
activity
than
@TiO
with
randomly
both
outside
inside
hydrogenation
‐chloronitrobenzene
‐CNB).
Mechanism
investigations
reveal
that
achieves
100
%
accessibility
preferably
adsorbs
–NO
group
‐CNB
while
weakly
–Cl
‐CAN,
promoting
catalytic
selectivity.
