Shaping metal-organic framework (MOF) with activated carbon and silica powder materials for CO2 capture

Metal-organic framework (MOF) UTSA-16 (Co) was shaped into pellets with diameters of 0.2 mm using activated carbon (AC), silica, and 8% polyvinyl butyral (PVB)/ethanol solution as a binder. A series of AC and silica pellets was prepared with different percentages of the UTSA-16 (Co) MOF. As the percentage of UTSA-16 (Co) increased, the CO2 adsorption capacity and CO2/N2 selectivity of the AC and silica pellets increased. AC/UTSA-16 (Co) -30% pellets showed 83% enhancement in CO2 adsorption capacity and 800% improvement in CO2/N2 selectivity at 298 K compared to the AC pellet. The stability of AC-UTSA-16 (Co) pellets was analyzed by exposing them to SO2 and NO2 for 2 days. The performance of AC was further investigated by preparing an AC composite pellet using UTSA-16 (Zn). AC/UTSA-16 (Zn)-30% pellets showed 75% enhancement in CO2 adsorption capacity and 1000% improvement in CO2/N2 selectivity than parent AC pellet. CO2 adsorption-desorption cycles were per-formed to examine the long-term stability of the pellet composites. The pellets were characterized by scanning electron microscopy (SEM) for particle morphology, thermogravimetric analysis (TGA) for thermal stability, and Brunauer-Emmett-Teller (BET) method for structural properties.

Automated summary

Metal-organic framework (MOF) UTSA-16 (Co) was shaped into pellets with binders of activated carbon (AC), silica, and 8% polyvinyl butyral (PVB)/ethanol solution. Increasing the percentage of UTSA-16 (Co) in the AC and silica pellets led to an increase in CO2 adsorption capacity and CO2/N2 selectivity. The stability of the pellets was tested by exposing them to SO2 and NO2, and the performance was further evaluated using AC composite pellets with UTSA-16 (Zn). The long-term stability of the pellet composites was examined through CO2 adsorption-desorption cycles, and the pellets were characterized using SEM, TGA, and the BET method.