Investigation of CO₂-Sorption Characteristics of Readily Available Solid Materials for Indoor Direct Air Capturing

Table 3

Experimental results for CO₂-adsorption on PEI on silica. Experiments shown here comprise desorption at 80°C.

Starting conditions			End conditions			Capacity^1	Cycle^2,3	Capacity corrected^1,4	Standard dev.^1
CO2	RH	T	CO2	RH	T
(ppm)	(%)	(°C)	(ppm)	(%)	(°C)	(mg g^-1)	#	(mg g^-1)	(mg g^-1)
1010	55.2	24.1	763	55.8	24.6	66.3	1	58.9	4.2
1010	48.4	23.1	750	50.5	24.0	69.8	3	62.4
1031	49.2	25.2	788	48.3	25.7	65.2	6	57.5
1050	49.4	25.6	821	47.2	26.9	61.5	7	53.5
1019	57.5	23.9	763	56.4	24.8	68.7	8	61.2	Arithm. mean^1
1002	54.4	25.3	788	54.5	26.1	57.4	9	50.2
1067	56.7	25.6	837	54.4	26.9	61.7	10	53.5	(mg g^-1)
1031	57.1	25.7	775	55.4	25.8	68.7	11	61.0	56.9
1019	64.1	24.9	802	58.3	25.3	58.2	12	50.7
1061	41.2	25.8	821	43.9	26.2	64.4	17	56.3
1018	45.0	24.6	763	51.7	25.1	68.4	22	60.9

¹CO₂-adsorption capacity given in milligram CO₂ per gram adsorber material. ²Number of adsorption/desorption cycles for this material batch. ³Missing cycle numbers are not listed here because the corresponding experiments were conducted with different CO₂-concentrations and/or humidity. ⁴CO₂-adsorption capacity corrected for leakage according to Equation (1).