Selective catalytic reduction of NO by methane over the Co/MOR catalysts in the presence of oxygen

A series of Co/MOR catalysts were prepared by impregnation method and used in the selective catalytic reduction of nitric oxide with methane (CH₄-SCR). These catalysts were characterized by XRD, BET, TG-MS, H₂-TPR, NH₃-TPD and NO-TPD; their performance in the CH₄-SCR of NO was investigated. The results showed that cobalt species exist as Co₃O₄ spinal in the Co/MOR catalysts; the acidity and redox and NO absorption/desorption ability of the Co/MOR catalysts are changed after the incorporation of cobalt in MOR zeolite, in comparison with pure MOR zeolite. The catalytic performance of Co/MOR is closely related to its redox and NO adsorption/desorption ability, which are dependent on the cobalt loading. The Co(10)/MOR catalyst with a cobalt loading of 10% exhibits high activity in the CH₄-SCR of NO; over it the conversion of nitric oxide reaches 54.2% at 330 ℃.