Sustainable functionalized metal-organic framework NH-MIL-101(Al) for CO separation under cryogenic conditions.

In this study, a sustainable NH-MIL-101(Al) is synthesized and subjected to characterization for cryogenic CO adsorption, isotherms, and thermodynamic study. The morphology revealed a highly porous surface. The XRD showed that NH-MIL-101(Al) was crystalline. The NH-MIL-101(Al) decomposes at a temperature (>500 °C) indicating excellent thermal stability. The BET investigation revealed the specific surface area of 2530 m/g and the pore volume of 1.32 cm/g. The CO adsorption capacity was found to be 9.55 wt% to 2.31 wt% within the investigated temperature range. The isotherms revealed the availability of adsorption sites with favorable adsorption at lower temperatures indicating the thermodynamically controlled process. The thermodynamics showed that the process is non-spontaneous, endothermic, with fewer disorders, chemisorption. Finally, the breakthrough time of NH-MIL-101(Al) is 31.25% more than spherical glass beads. The CO captured by the particles was 2.29 kg m. The CO capture using glass packing was 121% less than NH-MIL-101(Al) under similar conditions of temperature and pressure.