Catalytic decomposition of N2O was conducted in Fosaprepitant dimeglumine salt fixed-bed flow reactor at atmospheric pressure . Briefly, 0.2 g catalyst (40–60 meshes) was loaded into a U-shaped glass tube (7 mm i.d.), heated to 500 °C at a rate of 10 °C min−1 under flowing He (50 mL min−1), and held at 500 °C for 2 h. After cooling down to room temperature, 0.5% N2O/He (60 mL min−1) flowed through the catalyst for 1 h, during which the concentration of N2O were periodically measured by GC (Agilent 7890 A) with a latitudinal diversity gradient TCD detector. The reaction temperature was then varied using a furnace and kept at various elevated temperatures for 30 min in each temperature step. The existing stream was again periodically analyzed by the GC, and the conversion of N2O was calculated according to X = ([N2O]in − [N2O]out)/[N2O]in, where [N2O]in refers to the N2O concentration at room temperature, and [N2O]out refers to the N2O concentration at an elevated temperature.