Catalytic performance of CoO_x-CeO_x/ZrO₂ in NO oxidation and its resistance against SO₂

A series of CoO_x-CeO_x/ZrO₂ catalysts for NO oxidation were prepared by impregnation method and characterized by XRD, BET and H₂-TPR. The influence of the support as well as the content of cerium and cobalt on the catalytic performance of CoO_x-CeO_x/ZrO₂ in NO oxidation was investigated. The results indicated that the addition of Ce may improve the adsorption ability of the Co-based catalyst for oxygen and the dispersion of active cobalt species. Compared with CoO_x/ZrO₂ and CeO_x/ZrO₂, the CoO_x-CeO_x/ZrO₂ catalysts exhibit higher activity and better resistance against SO₂ for NO oxidation at low temperature.