DAC studies associated with first category of chemisorption materials.

Supports	PEI type	CO2 con. ppm	Adsorption T (°C)	Desorption T (°C)	CO2 purity	CO2 capacity mg g−1	Stability mg g−1	Ref.
Nanosilica	Ba	—	90	130/150	—	142–156	—	136
Nanosilica	Ba	—	70	85	Pure	147	Minimal leaching	119
Nanosilica	La	—	70	85	Pure	173	Leaching of amine	119
Nanosilica	PEI	∼400	∼25, dry	∼110	—	103.8	72.6b	129
Nanosilica	A-PEI	∼400	∼25, dry	∼110	—	99.46	90.2b	129
Nanosilica	T-PEI	∼400	∼25, dry	∼110	—	96.38	95b	129
—	MSiNTc	—	75	—	—	121	—	140
—	MMSVd	—	90	—	—	166.8	—	141
Fumed silica	FS-PEI-33		23 °C, RH 67%			77.89	4% – 4th cyclee	121
Fumed silica	FS-PEI-50		23 °C, RH 67%			62.05	4% – 4th cyclee	121
Fumed silica	PEI-H + PEG		50 °C, dry	—	—	29.9	Stable-20 cycle	124
SBA-15	PEI	400	75 °C, dry	50–110		22.44	Stable-20 cycle	124
SBA-15	PEI + PEG200	400	30 °C, dry			34.77	—	125
Zr-SBA-15	PEI	400	25 °C, dry			37.44	4% – 4th cyclee	138
SBA-15	PPI	400	35 °C, dry	110		33.44	Stable-50 cycle	137
Alumina	SynA-PEI-50	400	25 °C, dry			76.5	Constant – 3rd cycle	133
γ-alumina	PEI		30 °C, RH 50%			86.25	—	139
HP20 resin	PEI	400	25 °C			99.3	2% – 5th cyclee	142
Mesoporous carbon	PEI	400	25 °C, humid			99	3% – 10th cyclee	143
Carbon nanotube	PEI	400	30 °C, dry			47	3% – 10th cyclee	144

^aB-branched PEI; L-linear PEI and different capacities based on different adsorption temperatures, loading, molecules weights.

^bCO₂ capacity after the 4th cycle.

^cMesoporous silica nanotube.

^dMesoporous multilamellar silica vesicle.

^eCapacity reduction in the indicated cycle.