Investigation of multicomponent isothermal adsorption process in amine-grafted porous materials using in situ powder X-ray diffraction and R

Amine-grafted metal-organic frameworks such as diamine-Mg2(dobpdc) (dobpdc4- 4,4'-dioxidobiphenyl-3,3'-dicarboxylate) exhibit high CO2 adsorption performance. This is attributed to the cooperative and reversible insertion of CO2 into the metal-amine bonds, forming chains of ammonium carbamate. This chemisorption process improves CO2 uptake at low partial pressures, suitable for post-combustion CO2 capture. However, multicomponent adsorption experiments, conducted in our research group, revealed marked differences in the CO2 adsorption behaviour of diamine-Mg2(dobpdc) under dry and humid conditions, as indicated by in situ IR analysis. This proposal aims to investigate the structural and chemical features that dictate the CO2 capture performance of diamine-Mg2(dobpdc) MOFs at different relative humidity. This requires access to BM01 beamline to conduct in situ XRD experiments coupled with Raman analysis of the adsorbent upon exposed to multicomponent mixture (N2/CO2/H2O).