Abstract
Pb poisoning of MnOx-CeO2/Ti-bearing blast furnace slag SCR catalyst (MC) at low temperature is a tough challenge for NOx emission control in sintering plants. In this work, the poisoning behaviors of PbO and PbCl2 on MC catalyst were explored, and their deactivation mechanisms were also clarified. Results indicated that PbCl2 presented more severe poisonousness than PbO. The addition of PbO obstructed favorable electron conversions between Mn and Ce atoms, consuming more oxygen vacancies and active oxygen species, consequently hindering the redox cycle. Apart from Pb poisoning effect, newly generated HCl over PbCl2-doped catalyst could preferentially adsorb on CeO2 to form inactive Cl− bonds and NH4Cl deposition, further limiting the conversion of Ce4+ to Ce3+ and reducing surface acid sites. Therefore, MC catalyst was deactivated more severely by the double poisoning cycles (Pb + HCl). This work paves a way for the development of high-performance Pb-tolerant low-temperature SCR catalyst, as well as Pb-deactivated catalyst regeneration technology.
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