Detailed neutron powder diffraction (NPD) expts. were carried out on the parent and CO2 adsorbed Mg-MOF-74 (MOF: metal-org. framework). Data collected at low temp. revealed two CO2 adsorption sites on the pore surface and multiple changes in the framework as a function of CO2 loading. Upon heating the samples to room temp., the data revealed minimal changes in expansivity upon adsorption of up to 0.94 CO2/Mg (≈ 25% mass fraction). Further, temp.-dependent data collected on the bare framework reveals net zero thermal expansion between 10 and 475 K.
Rainer Beck, Ana Gutiérrez González
Berend Smit, Susana Garcia Lopez, Kevin Maik Jablonka, Christopher Patrick Ireland