Deactivation Mechanism of SCR Catalyst Based on Nano-ZrO₂

Abstract:

A catalyst, 8%Fe-10%MnOx-CeO2/ZrO2, was prepared and applied for selective catalytic reduction of NO with NH3 at low temperature. The effects of SO2 and H2O on the catalyst were studied. The results showed that in the absence of SO2 and H2O, the catalyst 8%Fe-10%MnOx-CeO2/ZrO2 has good activity and stability. The presence of SO2 and H2O make the catalyst deactivate, and the activity can be recovered mostly by heating at 400°C. Properties of the catalyst on different reaction stages were characterized by FT-IR to study the inactivation mechanism of the catalyst. The results showed that the catalyst deactivation is due to the deposition of ammonium sulfate on the catalyst and the sulphation of the metal oxides of the catalyst.

• Periodical: Advanced Materials Research (Volume 465)
• Pages: 8-13
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.465.8
• Online since: February 2012
• Authors: Rong Liu, Zhi Qin Yang, Hao Guan
• Keywords: Inactivation, Selective Catalytic Reduction (SCR), SO₂, Zirconia Nanoparticles

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