Effect of Co addition on the performance and structure of V/ZrCe catalyst for simultaneous removal of NO and Hg0 in simulated flue gas.

The effect of CoO x addition on the performance and structure of V 2 O 5 /ZrO 2 –CeO 2 catalyst for simultaneous removal of NO and Hg 0 in simulated flue gas was investigated by various methods including SEM, BET, XRD, XPS, H 2 –TPR and FT–IR. It was found that the introduction of CoO x not only greatly enhanced the redox properties of catalysts, but also increased the catalytic performance for simultaneous removal of NO and Hg 0 . The CoO x –modified V 2 O 5 /ZrO 2 –CeO 2 catalyst displayed excellent catalytic activity for NO conversion (89.6%) and Hg 0 oxidation (88.9%) at 250 °C under SCR atmosphere. The synergistic effect among vanadium, cobalt, and the ZrCe support could induce oxygen vacancies formation and promote oxygen mobility via charge transfer. Besides, CoO x could assist vanadium species in rapidly changing the valence by the redox cycle of V 5+ + Co 2+ ↔ V 4+ + Co 3+ . All the above features contribute to the excellent catalytic performance through CoO x addition. [ABSTRACT FROM AUTHOR]