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

Thermodynamic analysis of gate-opening carbon dioxide (CO₂) 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 CO₂ flow. In situ heating X-ray diffraction and thermogravimetric analyses under CO₂ revealed that reversible crystal structure and weight changes occurred upon CO₂ adsorption/desorption. The thermodynamic parameters of the CO₂ adsorption process by MOFs were determined by DSC analysis at various CO₂ partial pressures.