Thermodynamic analysis of gate-opening carbon dioxide adsorption behavior of metal-organic frameworks.

Thermodynamic analysis of gate-opening carbon dioxide (CO 2 ) adsorption behavior of metal-organic frameworks (MOFs) was investigated using differential scanning calorimetry (DSC). Unlike measurements under nitrogen atmosphere, obvious exothermic and endothermic peaks were observed in DSC curves under CO 2 flow. In situ heating X-ray diffraction and thermogravimetric analyses under CO 2 revealed that reversible crystal structure and weight changes occurred upon CO 2 adsorption/desorption. The thermodynamic parameters of the CO 2 adsorption process by MOFs were determined by DSC analysis at various CO 2 partial pressures.