Effect of amine groups on the NO adsorptive separation selectivity of FeAl‐BDC‐NH₂ MOFs

In this work, the effect of amine groups of MOFs materials on the NO separation selectivity under the simulated mixed atmosphere had been first investigated by comparison of NO adsorptive separation selectivity of Fe‐BDC, Al‐BDC, FeAl‐BDC and Fe‐BDC‐NH 2 , Al‐BDC‐NH 2 , FeAl‐BDC‐NH 2 synthesized by solvothermal method. The experimental results showed that the adsorption capacity of NO by Fe‐BDC‐NH 2 , Al‐BDC‐NH 2 , and FeAl‐BDC‐NH 2 was significantly larger than Fe‐BDC, Al‐BDC, and FeAl‐BDC at 100 kPa, which indicated ‐NH 2 promotes the adsorption of NO and was much higher than the adsorption capacity of CO 2 , O 2 , and N 2 under the same conditions. The NO adsorption capacity and selectivity of bimetallic FeAl‐BDC‐NH 2 were significantly better than that of monometallic Fe‐BDC‐NH 2 and Al‐BDC‐NH 2 . The NO adsorption capacity of FeAl‐BDC‐NH 2 can reach 216.42 cc g −1 , which exceeded lots of MOFs materials reported, and the adsorption selectivities of NO/CO 2 and NO/O 2 by IAST under the simulated mixed atmosphere reached 1,350 and 15,962. It also proved that the material adsorbed NO because NO forms NONOate with ‐NH 2 by the in situ IR and enthalpy calculation of adsorption, and the adsorption mechanism of NO was preliminarily investigated. The results provided a new direction for the application of adsorption and separation of NO in flue gas.