https://doi.org/10.1016/j.apsusc.2014.06.164
“In order to collect experimental evidence as to whether chemisorption of CO2 on amine-loaded samples would take place, as suggested in a previous publication [4] and in the XPS analysis, the behavior of adsorption isotherms for sample ZX10 at different temperatures was observed. As can be seen in Fig. 9, for zeolites loaded with high concentrations of amine, the usual physisorption behavior with temperature does not occur. That is to say, CO2 uptakes apparently increase for increasing temperatures in some amine loaded samples. Nevertheless, from the discussion in the previous sections, it is also reasonable to attribute such behavior also to diffusion resistances caused by the clogging of the porous structure of the adsorbent with MEA.”
“Fig. 9. Adsorption isotherms of CO2 at 298 and 348 K for ZX10.”