Amino-Functionalized Microporous MOFs for Capturing Greenhouse Gases CF and NF with Record Selectivity.

The capture and separation of fluorinated gases (F-gases) from N has the potential to not only reduce greenhouse gas emissions but also provide economic benefits for the semiconductor industry. In this work, two Ni-based metal-organic frameworks (MOFs), (Ni(ina), ina = isonicotinic acid) and amine-functionalized (Ni(3-ain), 3-ain = 3-aminoisonicotinic acid), were constructed for capturing F-gases (CF and NF). At ambient conditions, both materials exhibit very high CF sorption capacities (2.92 mmol g for and 2.69 mmol g for -. In addition, exhibited a record selectivity of 46.3 for the CF/N mixture at 298 K and 100 kPa, surpassing all benchmark adsorbents, including (34.7). The kinetic adsorption tests demonstrated that and performed well for CF/N and NF/N mixtures. According to grand canonical Monte Carlo (GCMC) simulations, CF or NF interacts with by multiple van der Waals interactions, resulting in stronger interaction than N. More importantly, dynamic breakthrough experiments verified the practical separation potential of the two materials for CF/N and NF/N mixtures.