resolver

CO 2
adsorbed, mmol/g
96 Chapter 4
Moving further to the 5-NH2-ip DL, respective Ru-DEMOFs (3a-3c) display the same
tendencies in their absorption behavior of CO2 and H2 as in their SBET (N2). From the results
of the XANES studies, we have already revealed that defects B are likely to be generated
at lower doping levels 3a-c (5-NH2-ip) as compared to the samples 1a-d (5-OH-ip). This
difference in defect A/B abundance leads to variation of the CO2 and H2 adsorption in case
of the 3a-c series. Even though 3a-c display higher uptake of CO2 and H2 than the parent
Ru-MOF, the uptake of CO2 and H2 does not further increase after the feeding level of 5-
NH2-ip is raised above 10% (3a) (Figures 4.31 and 4.32). Similar to 1d, we assign the
decrease of the uptake of CO2 and H2 at 1 bar observed for 3c as compared with 3a-b to
more abundant type B defects.
3
parent Ru-MOF
3a
3b
3c
2
1
0
0 200 400 600 800 1000
P, mbar
Figure 4.31. CO 2 isotherms collected at 298 K for the parent Ru-MOF and its derivatives 3a, 3b
and 3c with 5-NH 2 -ip DL. Black circles – parent Ru-MOF; blue triangles – 3a; dark cyan diamonds
– 3b; magenta squares – 3c.