Catalytic performance of Co/Hβ in N₂O decomposition

The catalyst of cobalt oxide supported on Hβ zeolite (Co/Hβ) was prepared by impregnation method and characterized by XRD, H₂-TPR, NH₃-TPD, and SEM. The effects of calcination temperature and cobalt loading on the catalytic performance of Co/Hβ in N₂O decomposition were investigated. The results showed that cobalt species are present mainly in the form of Co₃O₄ spinel oxide. The acidity, acid amount and redox property of the Co/Hβ catalyst were significantly affected by the calcination temperature; the Co-Al-O species that is difficult to reduce by hydrogen is formed at a calcination temperature over 700℃. The catalytic activity of the Co/Hβ catalyst was affected by the calcintion temperature and cobalt loading. The Co/Hβ catalyst calcined at 600℃ and with a cobalt loading of 10%~15% exhibits excellent catalytic activity in N₂O decomposition; the temperatures t₁₀, t₅₀ and t₉₅ for N₂O decomposition are 325~329℃, 364~367℃, and 406~408℃, respectively.