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. 2022 Oct 19;122(24):17647–17695. doi: 10.1021/acs.chemrev.2c00140

Table 3. Zeolitic Adsorbents for CO2 Separation from CH4a.

Material Structure Si/Al ratio Estimated framework negative chargeb T (°C) Q1bar (mmol/g) WC5–1 (mmol/g)
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(kJ/mol)		 ref·
Si-ITQ-29 LTA inf 0 30 1.04 3.11 3.5c 3.2c 21.0 (501)
LTA-5 LTA 5 0.17 30 3.07 2.51 7.2c 3.5c 32.8 (501)
LTA-5d LTA 5 0.17 30 2.90 0.70 - 20 32.8 (483)
LTA-5 LTA 5 0.17 30 3.36 2.17 7.9 3.0 32.8 (483)
5A LTA 1 0.5 25 4.67 - 5.8 - - (521)
4A LTA 1 0.5 30 4.23 0.81 3.2c 1.2c 49.0 (501)
AlPO-42 LTA - 0 25 1.26 3.21 3.9c 3.7c 11.9 (152)
AlPO-42d LTA - 0 30 1.00 0.25 - 6.0 24.4 (483)
AlPO-42 LTA - 0 30 1.97 2.12 4.9 3.2 24.4 (483)
Na,Cs-RHO RHO 4.5 0.18 30 3.49 2.07 75c 8.8 33.0 (273)
M-DNL-6 RHO - <0.18 25 4.65 - 12.2c - 39.0 (505)
Na-SAPO-RHO RHO - <0.18 25 3.45 - 179 - 42.5 (263)
Na-SAPO-RHOe RHO - <0.18 25 1.52 - 618c - 42.5 (263)
PST-29 PWN 4.5 0.18 25 4.26 - 6.9 - - (502)
NaTEA-ECR-18 PAU 3.5 0.22 25 2.99 0.17 11c 15.6 53.0 (275)
NaTEA-ZSM-25 MWF 3.4 0.23 25 3.50 0.29 22c 42 65.0 (275)
Li(0.13)-ZSM-25 MWF 3.15 0.24 30 2.4 1.4 - - 33 (515)
Li(0.13)-ZSM-25f MWF 3.15 0.24 30 1.94 - 67 - 33 (515)
NaTEA-PST-20 - 3.1 0.24 25 3.17 0.73 15c 24 44.0 (275)
K-MER-2.3 MER 2.3 0.30 25 2.99 - 12 - 30 (264)
K6.2-MER-4.2 MER 4.2 0.19 25 3.74 0.66 - - 35 (517)
K6.2-MER-4.2 MER 4.2 0.19 25 - - 154g - 35 (517)
13X FAU 1.2 0.45 25 4.69 1.36 7.6 3.0 37.2 (522)
13Xh FAU 1.2 0.45 30 4.13 1.13 89 66 - (520)
NaXd FAU 1.2 0.45 30 4.30 0.30 - 61 37.5 (483)
NaX FAU 1.2 0.45 30 5.60 0.97 7.7 2.8 37.5 (483)
EMC-1d FAU 3.8 0.21 30 4.80 0.40 - 41 33.0 (483)
EMC-1 FAU 3.8 0.21 30 5.23 1.68 17.4 4.6 33.0 (483)
Na-USYd FAU 8.6 0.10 30 1.20 0.70 - 12.0 29.3 (483)
Na-USY FAU 8.6 0.10 30 1.73 2.15 6.2 4.0 29.3 (483)
SAPO-37d FAU - - 30 2.80 1.00 - 14.0 31.3 (483)
SAPO-37 FAU - - 30 2.56 2.27 10.9 4.2 31.3 (483)
Si-SSZ-13 CHA inf 0 25 2.24 2.38 4.0c 2.7c 25.3 (152)
Si-SSZ-13 CHA inf 0 30 1.90 - 4.2 - 23.1 (504)
r1KCHA CHA 1 0.5 30 1.33 0.21 15 10 48.9 (516)
r1.2KCHA CHA 1.2 0.45 0 2.11 0.36 93c 33 - (258)
r1.9KCHA CHA 1.9 0.34 0 0.81 - 354 - - (262)
r1.9KCHAi CHA 1.9 0.34 30 - - 583 - - (262)
r1.9KCHA CHA 1.9 0.34 30 1.49 - 105 - - (262)
CHA-6 CHA 5 0.17 30 4.65 1.01 3.7c 2.4c 36.6 (152)
AlPO-34 CHA - 0 25 1.60 1.90 4.0c 2.7c 22.3 (152)
SAPO-34 CHA - 0.15 25 2.80 1.84 5.0c 2.8c 31.5 (152)
SAPO-34 CHA - - 25 2.82 - 8.8 - - (523)
Si-SSZ-39 AEI 150 0.01 30 1.82 - 4.0 - 26.2 (504)
Si-SSZ-23 STT inf 0 30 1.99 - 4.9 - 23.5 (504)
Si-RUB-41 RRO inf 0 30 1.90 - 10.0 - 28.6 (504)
Rb-ZK-5h KFI 3.8 0.21 30 2.30 0.70 17 8 37.0 (520)
Rb-ZK-5 KFI 3.8 0.21 30 2.67 0.80 5.5 3.4 37.0 (520)
Cs-ZK-5h KFI 3.8 0.21 30 1.70 0.67 17 9 33.0 (520)
Cs-ZK-5 KFI 3.8 0.21 30 2.25 0.83 4.4 2.8 33.0 (520)
SAPO-56 AFX - <0.15 20 3.86 - 5.4 - 36.0 (506)
a

Adsorption isotherm values have been extracted from the references where they were not explicitly displayed. Selectivities have been calculated therefrom, unless otherwise specified.

b

The estimated framework negative charge gives analogous information as the Si/Al ratio and is defined in ref (152). Materials with values above 0.33 are considered to be highly polar.

c

These selectivities have been directly taken from their respective references.

d

Breakthrough data of a CO2/CH4 50:50 mixture483 at 5 bar total pressure.

e

Breakthrough data of equimolar CO2/CH4 mixture, 1 bar total pressure.263

f

Breakthrough data of equimolar CO2/CH4 mixture, 2 bar total pressure.515

g

Breakthrough data of 10/30/50 (CO2/CH4/He), 1 bar total prressure.517

h

Breakthrough data of a CO2/CH4 40:60 mixture520 at 5 bar total pressure.

i

Breakthrough data of equimolar CO2/CH4 mixtures262 at 1 bar total pressure.