Aminopropyl-Functionalized Silica CO₂ Adsorbents via Sonochemical Methods

Table 2

Product CO₂ adsorption capacities, heats of adsorption of CO₂, and amine efficiencies.

	20°C			75°C
	CO2 capacity (wt%)	(CO2) (kJ·mol^−1)	CO2 per N (mol·mol^−1)	CO2 capacity (wt%)	(CO2) (kJ·mol^−1)	CO2 per N (mol·mol^−1)
±error	0.2	4	—	<0.1	6	—
HX	3.7	36	n/a	1.1	53	n/a
A24	4.4	47	0.60	1.6	61	0.22
S4	5.3	51	0.62	2.0	70	0.23
S2-25	4.9	60	0.54	1.9	90	0.21

Error estimated from the average of standard deviation obtained for duplicate measurements taken for A24.