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286 SORBENTS FOR APPLICATIONS
3.0
2.5
N 2 loading m mol/gm 1.5
2.0
1.0
0.5
0.0
0 1000 2000 3000 4000
Pressure torr
◦
Figure 10.6. Nitrogen isotherms at 23 Con: ( ) Li-LXS (99% Li, 1% Na, Si/Al = 1), ( )LiX
(94% Li, 6% Na, Si/Al = 1.25), and ( )NaX (Si/Al = 1.25), from Chao, 1989.
1.4
1.3
1.2
1.1
N 2 amount adsorbed, m mol/g 0.9
1.0
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
+
+
+
+
Extent of Li exchange in NaX, Li /(Li + Na )
◦
+
Figure 10.7. Dependence of nitrogen adsorption at 23 C at 1 atm on fractional Na exchange
+
by Li in LSX. The threshold value is at 80% Li for X zeolite with Si/Al = 1.5 (Chao, 1989). The
data on LSX are from Coe et al., 1992.
