Abstract
Direct
air
capture
(DAC)
is
a
negative
emission
technology
for
removing
CO
2
from
the
atmosphere
to
maintain
level
within
reasonable
range
so
as
address
greenhouse
effects.
In
this
study,
operational
optimization
of
lab‐scale
DAC
has
been
investigated
using
crossflow
air‐liquid
contactor
loaded
with
three
dimensionally
printed
Gyroid
packing
structure
and
potassium
sarcosinate
solvent.
The
effects
various
parameters,
including
feed
flow
rate,
liquid
solvent
geometry,
ambient
temperature,
are
examined.
results
demonstrate
that
design
achieves
comparable
performance
conventional
packed
beds
but
significantly
lower
pressure
drop
up
77.8%,
suggesting
its
potential
an
efficient
cost‐effective
solution
gas–liquid
contactors
in
DAC.
Additionally,
study
explores
climate
impact
on
finds
temperature
increases
35
95°F
at
fixed
relative
humidity
80%,
rate
increased
23.2%
46.8%
better
stability.
research
highlights
importance
optimizing
conditions
improve
feasibility
systems
addressing
The
rising
CO2
concentration
in
the
atmosphere
contributes
significantly
to
global
warming,
necessitating
effective
carbon
capture
techniques.
Amine-based
solvents
are
widely
employed
for
chemisorption
of
CO2,
although
they
have
drawbacks,
such
as
degradation,
corrosion,
and
high
regeneration
energy
requirements.
Physical
adsorption
utilizing
microporous
adsorbents
is
a
viable
alternative
that
offers
excellent
efficiency
selectivity
capture.
This
work
presents
facile
one-pot
synthesis
3D-triptycene-containing
hyper-cross-linked
polymer
(TBPP-OH)
possessing
hydroxyl
groups.
presence
triptycene
units
TBPP-OH
polymeric
structure
gives
several
desirable
features,
inherent
microporosity,
larger
surface
area,
improved
thermal
stability.
showed
considerable
microporosity
(%Vmic
=
70%),
BET-specific
area
(SABET)
838
m2
g–1,
good
stability
(Td
372
°C
char
yield
>
60%)
which
makes
it
promising
adsorbent
A
strong
affinity
was
shown
by
with
Qst
32.9
kJ/mol
demonstrating
superior
capacity
2.77
mmol/g
at
273
K
1
bar
pressure
where
volume
micropore
plays
significant
role.
values
over
N2
CH4
were
also
estimated
be
reasonably
indicating
potential
separation
different
applications.
mechanism
investigated
using
Langmuir
dual-site
models.
Catalysis Science & Technology,
Год журнала:
2023,
Номер
13(17), С. 4895 - 4918
Опубликована: Янв. 1, 2023
Green
fuels
are
derived
from
renewable
resources
that
can
replace
or
reduce
the
use
of
fossil
fuels,
and
they
help
carbon
emissions
dependence
on
finite
including
oil
natural
gas.
Energy Conversion and Management,
Год журнала:
2023,
Номер
291, С. 117280 - 117280
Опубликована: Июнь 29, 2023
Direct
air
capture
(DAC)
technology
is
still
facing
some
challenges
that
need
to
be
addressed
before
the
can
widely
deployed.
One
major
challenge
high
overall
system
energy
requirement,
and
it
main
bottleneck
in
DAC
commercialization.
This
study
aims
unlock
potential
of
integrating
with
Heat
Ventilation
Air
Conditioning
(HVAC)
systems.
A
thermodynamic
model
used
test
effect
varying
adsorption
desorption
conditions
on
unit
performance,
assess
characteristics
positioned
six
different
locations
within
handling
(AHU).
The
results
show
by
only
locating
Position
6
(i.e.,
positioning
after
exhaust
fan
AHU)
comparison
a
stand-alone
unit,
efficiency
improved
at
times
through
summer
season
Qatar.
Specifically
increases
from
5.3%
27.19%
for
8th
June
2022
11:00
am
Additionally,
using
other
filters
AHU
allows
full
recirculation
10
h.
Based
this
scenario
weather
data
20th
July
12:00
pm,
hottest
day
Qatar
2022,
reduction
44%
cooling
load
achieved.
Locating
point
supplied
best,
however,
case
air,
will
achieve
better
performance.
ACS Applied Polymer Materials,
Год журнала:
2024,
Номер
6(7), С. 3996 - 4004
Опубликована: Март 20, 2024
The
increasing
amount
of
CO2
in
the
atmosphere
is
recognized
as
a
major
cause
global
warming
and
its
harmful
consequences.
Industrially,
captured
by
chemisorption
using
amine-based
solvents.
However,
there
are
drawbacks
to
wet-scrubbing
process,
including
corrosion
high
regeneration
energy.
physical
adsorption
porous
solid
adsorbents
viable
efficient
alternative.
Therefore,
designing
effective
polymers
with
microporosity
polar
functional
groups
simple
approach
important
for
carbon
dioxide
capture.
This
work
describes
design,
characterization,
capture
studies
3D-triptycene
phenanthroline-based
microporous
polymer
(TPPM).
polymeric
framework
TPPM
incorporated
3D
triptycene
phenanthroline
robust
motifs
yield
inflexible,
twisted
frameworks
an
abundance
micropores
ultramicropores.
confers
desirable
features
such
higher
surface
area,
microporosity,
physiochemical
thermal
stability.
demonstrated
excellent
stability
(Td
>
380
°C)
larger
BET-specific
area
1120
m2
g–1
considerable
which
makes
it
promising
adsorbent
applications.
Morphological
characterization
sample
shows
formation
microspheres
diameters
around
0.5–1
μm.
has
strong
affinity
Qst
23
kJ
mol–1
demonstrating
capacity
2.76
mmol
at
273
K
1.85
298
where
micropore
volume
(Vmic
=
0.445
cm3
g–1)
plays
potential
role.
outperforms
several
other
literature-reported
polymers.
also
selectivity
over
CH4
N2,
suggesting
good
promise
separation.
Journal of environmental chemical engineering,
Год журнала:
2024,
Номер
12(2), С. 112193 - 112193
Опубликована: Фев. 16, 2024
Carbon
removal
technologies,
such
as
direct
air
capture
(DAC),
hold
great
potential
in
mitigating
anthropogenic
CO2
emissions.
Amine-tethered
metal-organic
frameworks
(MOFs)
that
selectively
via
chemisorption
have
been
highlighted
frontrunners
for
technologies.
To
this
end,
ethylenediamine
(ED)
was
employed
to
decorate
the
metal
sites
of
Mg-MOF-74,
and
both
bare
amine-modified
were
thoroughly
characterized
studied
DAC
using
an
automated
fixed-bed
sorption
device.
The
material
exhibited
a
promising
capacity
up
1.8
mmol/g
from
400
ppmv
humid
conditions,
although
amount
adsorbed
H2O
several
times
higher.
highest
adsorption
capacities
measured
at
25–35
°C,
while
decreased
observed
12
°C
due
slower
rate.
In
dry
cyclic
adsorption-desorption
tests,
reduced
slightly
18
cycles.
However,
2
vol%
humidity,
dropped
rapidly
over
successive
cycles,
revealing
poor
hydrolytic
stability.
Preliminary
coating
experiments
conducted
on
stainless
steel
plates
cordierite
monoliths,
suggesting
reasonably
even
layers
could
be
achieved
these
substrates
with
relatively
simple
techniques.
High
water
adsorption,
slow
rate
low
temperatures,
rapid
decrease
conditions
may
limit
application
adsorbent
DAC.
vital
aspects
real
MOFs
DAC,
kinetics
stability
are
rarely
explored
detail
literature,
results
indicate
warrant
extensive
study
development
practically
applicable
adsorbents.
