Catalytic performance of Co /Hβ in N_2O 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 Co3O4spinel 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 at600 ℃ and with a cobalt loading of 10% ~ 15% exhibits excellent catalytic activity in N2O decomposition; the temperatures t10,t50and t95for N2O decomposition are 325 ~ 329 ℃,364 ~ 367 ℃,and 406 ~ 408 ℃,respectively.