Destructive Adsorption of Nitrogen Trifluoride (NF₃) Using M-MOF-74 with Open Metal Sites

Using solid adsorbents for the destructive sorption of nitrogen trifluoride (NF₃) presents a potential solution to its dual challenges as a potent greenhouse gas and hazardous compound in microelectronics. In this study, a series of MOFs (M-MOF-74, M = Mg, Co, Ni, Zn) with open metal sites (OMSs) are utilized for NF₃ adsorption. By employing single-component adsorption isotherms and the ideal adsorbed solution theory (IAST) selectivity calculations, the adsorption performance of various adsorbents is evaluated. The results indicate that Mg, Co, and Ni-MOF-74 exhibit high adsorption capacities for NF₃, while Zn-MOF-74 shows a lower adsorption capacity, likely due to the weaker Lewis acidity of Zn²⁺. Experimental findings from PXRD and gas adsorption studies indicate structural pore alteration in the MOF-74 series following NF₃ gas adsorption. Theoretical computational analyses reveal that the MOF-74 series has a higher adsorption affinity for NF₃ compared to N₂. This research provides insights into the use of efficient MOF sorbents for the destructive adsorption of NF₃.