Abstract
The Co–Mn/Ti–Ce catalyst prepared by sol–gel and impregnation method was evaluated for catalytic oxidation of Hg0 in the simulated flue gas compared with Co/TiO2 and Co–Mn/TiO2. The results showed that Co–Mn/Ti–Ce catalyst exhibited higher catalytic activity (around 93% Hg0 removal efficiency in the temperature of 150 °C with 6% O2, 400 ppm NO, 200 ppm SO2 and 3% H2O) than Co/TiO2 and Co–Mn/TiO2. Based on the characterization results of N2 adsorption–desorption, XRD, UV–Vis, XPS, H2-TPR and Hg-TPD, it could be concluded that the lower band gap, better reducibility and mercury adsorption capability and the presence of Co3+/Co2+, Mn4+/Mn3+ and Ce4+/Ce3+ redox couples as well as surface oxygen species contributed to the excellent Hg0 oxidation removal performance. In addition, well dispersion of active components and a synergetic effect among Co, Mn and Ce species might improve the activity further. A Mars–Maessen mechanism is thought to be involved in the Hg0 oxidation. The lattice oxygen derived from MnO x or CoO x would react with adsorbed Hg0 to form HgO and the consumption of lattice oxygen could be replenished by O2. For Co–Mn/Ti–Ce, MnO x−1 could be alternatively reoxidized by the lattice oxygen derived from adjacent CoO x and CeO x which is beneficial to the Hg0 oxidation.
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The authors would like to thank for the support from Test Center of Wuhan University.
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Li, H., Wang, S., Wang, X. et al. Comparative study of Co/TiO2, Co–Mn/TiO2 and Co–Mn/Ti–Ce catalysts for oxidation of elemental mercury in flue gas. Chem. Pap. 71, 1569–1578 (2017). https://doi.org/10.1007/s11696-017-0152-5
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DOI: https://doi.org/10.1007/s11696-017-0152-5