Chemistry Reference
In-Depth Information
4.3.1 Temperature and Pressure Effect
Tables
4.2
and
4.3
list the methane uptake of some representative POFs under low
and high pressure, respectively. At low pressure, CH
4
uptakes of POFs are relatively
low with values below 1.7 mmol g
−
1
. The CH
4
uptakes of POFs are independent of
their surface area. In addition, from the data collected at 273 K and 298 K, along
with the increasing temperature, the CH
4
uptake of POFs greatly decreases, indicat-
ing that temperature is an important factor influencing CH
4
adsorption ability.
When measurement is performed under high pressure, the CH
4
uptakes of
POFs reach a promising level. Yaghi et al. reported a series of COFs for the CH
4
storage [
11
]. Among these POFs, PPN-4 with 6,461 m
2
g
−
1
BET surface area had
the highest CH
4
uptake with a value of 17.1 mmol g
−
1
, at 55 bar and 295 K.
Table 4.2
Methane storage in POFs under low pressure
Material
S
BET
(m
2
/g)
P
(bar)
T
(K)
CH
4
uptake (mmol/g)
References
5,600
1
273
1.12
[
29
]
PAF-1
Li@PAF-1
479
1.22
273
1.3
[
31
]
2,932
1
273
1.68
[
29
]
PAF-3
2,246
1
273
1.12
[
29
]
PAF-4
PPF-1
1,740
1
273
1.52
[
44
]
1,470
1
273
1.44
[
44
]
PPF-2
419
1
273
0.63
[
44
]
PPF-3
PPF-4
726
1
273
0.83
[
44
]
1,119
1
273
1.04
[
45
]
PAF-41
298
0.68
[
45
]
PAF-42
640
1
273
0.68
[
45
]
1
298
0.34
[
45
]
515
1
273
0.60
[
45
]
PAF-43
1
298
0.28
[
45
]
532
1
273
0.66
[
45
]
PAF-44
1
298
0.41
[
45
]
BILP-2
708
1
273
0.88
[
35
]
1
298
0.56
[
35
]
1,135
1
273
1.63
[
35
]
BILP-4
1
298
1.13
[
35
]
599
1
273
0.94
[
35
]
BILP-5
1
298
0.63
[
35
]
BILP-7
1,122
1
273
1.63
[
35
]
1
298
1.13
[
35
]
1,306
1
273
1.50
[
46
]
BILP-3
1
298
1.06
[
46
]
1,261
1
273
1.69
[
46
]
BILP-6
1
298
1.19
[
46
]
