SO 2 Capture at Low Pressure in a Prototypical MIL-53 Aluminum MOF Family: The Influence of Pore Expansion

Not only is excellent performance in SO capture by porous materials (uptake above 17 mmol g ) relevant, but also finding a correlation between the architecture changes into a family and their SO adsorption is very useful. In this contribution, we studied the SO adsorption behavior (at very low pressure) of an Al(III)-MOF family that shares the pore architecture of MIL-53. The results indicate an inversely proportional trend for the SO capture and pore expansion, since by increasing the length of the channel pore, the SO uptake gradually decreases. In addition, this trend is clearly observed in the heat of adsorption, which describes the interaction between the SO molecule and the μ-OH functional group. These finding are supported by experimental analysis and computational studies.