Comparisons of equilibrium CO₂ uptake and selectivity on various zeolites and SAPOs.

Material	CO2 uptake [mmol g−1]		CH4 uptake [mmol g−1]		N2 uptake [mmol g−1]	α(CO2/CH4) (0.02/0.98 bar)	α(CO2/N2) (0.15/0.85 bar)	Ref.
	0.02 bar	0.15 bar	1.0 bar	0.98 bar	0.85 bar
H-SAPO-RHOa	0.44	1.84	4.41	0.83	0.210	26	50	This work
Na-SAPO- RHO a	1.21	2.42	3.53	0.027	0.070	2196	196	This work
K-SAPO-RHOa	0.01	0.046	0.87	0.024	0.010	20	29	This work
Cs-SAPO-RHOa	0.01	0.054	0.45	0.017	0.014	30	22	This work
Na-1-SAPO-RHOa	0.81	2.04	3.43	0.090	0.116	441	105	This work
Na-2-SAPO-RHOa	0.71	2.28	3.38	0.042	0.089	828	145	This work
Na-4-SAPO-RHOa	0.60	1.82	3.08	0	0	∞	∞	This work
H-SAPO-RHOa	0.49	1.95	4.60	0.38	0.23	63	48	24
SAPO-34b	0.24	1.20	3.26	0.65	—	20	—	25
Na-SAPO-34b	0.89	2.10	3.40	0.62	0.26	75	44	25
SAPO-17c	0.29	1.29	3.27	—	0.31	—	23	26
SAPO-35c	0.29	1.87	3.68	—	0.32	—	33	26
SAPO-56c	0.76	2.87	5.44	—	0.39	—	42	26
Na-RHOa	2.06	3.30	4.23	0.11	—	960	—	15a
Na-CHAa	2.64	3.95	4.70	1.60	0.60	81	37	27
Na-KFId	—	3.40	—	—	0.27	—	71	28
Na-Xa	2.00	3.17	5.00	0.67	0.23	147	78	29
Na-MERa	1.50	2.50	3.80	0.32	—	229	—	30
K-MERa	1.93	2.93	3.57	0.052	—	1818	—	30
NaKA (K = 17%)a	1.00	2.30	3.43	—	0.02	—	660	22
Na-Aa	3.20	3.90	4.80	1.34	0.65	117	34	31
Mg-MOF-74a	2.30	5.65	8.00	1.11	—	102	—	32
SIFSIX-3-Zna	1.95	2.30	2.55	0.79	0.46	121	28	32a
UTSA-280a	0.48	1.58	2.78	0.10	0.15	235	60	33

^aThe adsorption data were measured at 298 K.

^bThe adsorption data were measured at 293 K.

^cThe adsorption data were measured at 273 K.

^dThe adsorption data were measured at 303 K.