Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 15, 2025
Abstract
Ethylene
and
propylene
are
important
raw
chemicals
that
in
high
demand.
Methanol‐to‐olefins
(MTO)
is
a
promising
alternative
approach
for
producing
ethylene
from
non‐petroleum
feedstocks,
which
the
separation
of
propylene/ethylene
particularly
crucial.
In
this
study,
metal
azolate
framework
(MAF)
[Zn
7
(
μ
‐H
2
O)(tppa)
4
(HCOO)
]
(MAF‐68,
where
H
3
tppa
=
tris(4‐(1‐(tetrahydro‐2
‐pyran‐2‐yl)‐1
‐pyrazol‐4‐yl)phenyl)amine)
has
been
synthesized
with
rare
zinc
pyrazolate
chains
comprising
O
bridges,
namely
Zn
O)(Rpz)
12
(Rpz
−
denotes
groups),
mixtures.
Sorption
experiments
indicated
MAF‐68
shows
remarkable
uptake
4.19
mmol
g
−1
(at
10
kPa),
significantly
higher
than
those
many
other
reported
porous
materials
C
6
/C
separation.
also
selectivity
9.5
2/5
.
Breakthrough
further
confirm
potential
material
high‐purity
(99.9999%)
(99.9999%).
The
separation
of
methanol-to-olefin
(MTO)
products
to
obtain
high-purity
ethylene
(C2H4)
and
propylene
(C3H6)
is
a
challenging
yet
critical
task,
as
these
compounds
are
essential
industrial
raw
materials
for
polymer
synthesis.
However,
developing
adsorbents
with
high
selectivity
productivity
C2H4/C3H6
remains
significant
challenge
an
urgent
necessity.
In
this
study,
porphyrinyl
metal-organic
framework
(MOF),
Al-TCPP,
was
developed
the
simultaneous
recovery
C3H6
C2H4
through
one-step
adsorption-desorption
process.
Benefiting
from
its
well-developed
microporous
structure
abundant
N-
O-accessible
sites,
Al-TCPP
demonstrated
exceptional
adsorption
capacities
ethane
(C2H6)
over
under
ambient
conditions.
(in
cm3·g-1)
reached
162.4
118.5
C2H6
at
298
K
100
kPa.
ideal
adsorbed
solution
theory
(IAST)
values
C3H6/C2H4
C2H6/C2H4
were
10.1
1.8,
respectively.
Thermodynamic
studies
theoretical
calculations
revealed
stronger
interactions
between
molecules
than
C2H4.
Systematic
breakthrough
experiments
outstanding
performance
binary
mixtures,
well
ternary
C3H6/C2H6/C2H4
achieving
record
productivities
150.2
86.5
L·kg-1
polymer-grade
(≥99.9%)
(≥99.5%),
Notably,
remained
stable
variable
flow
rates,
temperatures,
humidities,
multiple
cycles.
Overall,
study
highlighted
highly
competitive
adsorbent
addressing
challenges
in
MTO
product
separation.
Moreover,
it
offered
valuable
insights
into
design
MOFs
heteroatom-rich
accessible
sites
efficient
low-carbon
hydrocarbons.
Journal of the American Chemical Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 8, 2025
Exploring
humidity-resistant,
ethane-selective
adsorbents
for
the
one-step
purification
of
polymer-grade
(>99.95%)
ethylene
from
ethane-ethylene
mixtures
is
great
importance,
yet
remains
a
significant
challenge.
To
address
this
challenge,
we
present
novel
strategy
constructing
"superhydrophobic
molecular
selector"
(SMS)
based
on
porous
organic
cage
(POC),
which
features
superhydrophobic
outer
surface
and
an
inner
cavity
with
multiple
functional
sites.
The
resulting
SMS-POC-1
demonstrates
excellent
C2H6
adsorption
capacity
(97
cm3
g-1
at
298
K)
C2H6/C2H4
selectivity
(Sads
=
2.40
K),
offering
superior
trade-off
between
ethane
among
all
C2H6-selective
adsorbents.
Especially,
breakthrough
experiments
demonstrate
that
efficiently
produces
C2H4
60%
relative
humidity
(RH),
making
it
highest-selectivity
adsorbent
reported
to
date
can
stably
operate
in
humid
environment.
combination
experimental
results
theoretical
calculations
reveals
coexistence
synergistic
C-H···π
interactions
hydrogen-bonding
sites
accounts
high
separation
performance
under
conditions
SMS-POC-1.
Our
work
thus
not
only
general
guiding
design
humidity-resistant
adsorption-separation
materials
but
also
presents
promising
candidate
potential
applications
hydrocarbon
separation.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 15, 2025
Abstract
Ethylene
and
propylene
are
important
raw
chemicals
that
in
high
demand.
Methanol‐to‐olefins
(MTO)
is
a
promising
alternative
approach
for
producing
ethylene
from
non‐petroleum
feedstocks,
which
the
separation
of
propylene/ethylene
particularly
crucial.
In
this
study,
metal
azolate
framework
(MAF)
[Zn
7
(
μ
‐H
2
O)(tppa)
4
(HCOO)
]
(MAF‐68,
where
H
3
tppa
=
tris(4‐(1‐(tetrahydro‐2
‐pyran‐2‐yl)‐1
‐pyrazol‐4‐yl)phenyl)amine)
has
been
synthesized
with
rare
zinc
pyrazolate
chains
comprising
O
bridges,
namely
Zn
O)(Rpz)
12
(Rpz
−
denotes
groups),
mixtures.
Sorption
experiments
indicated
MAF‐68
shows
remarkable
uptake
4.19
mmol
g
−1
(at
10
kPa),
significantly
higher
than
those
many
other
reported
porous
materials
C
6
/C
separation.
also
selectivity
9.5
2/5
.
Breakthrough
further
confirm
potential
material
high‐purity
(99.9999%)
(99.9999%).
