Inverse Adsorption Separation of N2O/CO2 in AgZK‐5 Zeolite

Abstract Nitrous oxide (N 2 O), as the third largest greenhouse gas in the world, also has great applications in daily life and industrial production, like anesthetic, foaming agent, combustion supporting agent, N or O atomic donor. The capture of N 2 O in adipic acid tail gas is of great significance but remains challenging due to the similarity with CO 2 in molecular size and physical properties. Herein, the influence of cation types on CO 2 −N 2 O separation in zeolite was studied comprehensively. In particular, the inverse adsorption of CO 2 −N 2 O was achieved by AgZK‐5, which preferentially adsorbs N 2 O over CO 2 , making it capable of trapping N 2 O from an N 2 O/CO 2 mixture. AgZK‐5 shows a recorded N 2 O/CO 2 selectivity of 2.2, and the breakthrough experiment indicates excellent performance for N 2 O/CO 2 separation. The density functional theory (DFT) calculation shows that Ag + has stronger adsorption energy with N 2 O, and the kinetics of N 2 O is slightly faster than that of CO 2 on AgZK‐5.