Table 1 Isosteric heat of adsorption, gas sorption, and selectivity data.

MaterialCO2 Qst
(kJ mol−1)*
CO2 uptake (298 K)
(mmol g−1)
N2
(298 K,
1 bar)
mmol
(g−1)
H2O
(298 K,
95% RH)
(mmol
g−1)
IAST selectivity
500
ppm
1000
ppm
3000 ppm5000
ppm
10,000
ppm
SCN§SCW||
Mg-MOF-74420.050.20.50.91.60.85~33.33238N/A
Zeolite 13X390.40.91.41.72.00.4218.76562N/A
SIFSIX-18-Ni-β520.40.81.41.82.20.041.64/0.96#N/A**16.2‡‡
SIFSIX-3-Ni450.40.71.21.51.80.168.801438N/A††
NbOFFIVE-1-Ni541.31.82.02.12.30.1510.0965280.03‡‡
TIFSIX-3-Ni491.21.71.91.92.00.187.468090N/A††
ZIF-827~0.0006<0.005<0.0050.0060.010.11.44#3.10.08

*Virial fitting of CO2 sorption data collected between 0 and 10 mbar.

†Data collected on surface measurement systems vacuum DVS unless otherwise stated.

‡Selectivity for sorbents was determined by interpolation of raw isotherm data points (see the Supplementary Materials for further details).

§Selectivity based upon 500 ppm CO2 concentration.

||Selectivity based upon 500 ppm CO2 concentration/74% RH.

¶Water uptake for Mg-MOF-74 was acquired from (30).

#Water uptake based upon surface measurement systems intrinsic DVS data.

**IAST selectivity suggests partial sieving (see the Supplementary Materials).

††IAST cannot be calculated due to negative adsorption observed as a result of phase change in the presence of water.

‡‡Calculated at 74% RH and 500 ppm.