Metal–organic framework-derived CeO₂–ZnO catalysts for C₃H₆-SCR of NO: an in situ DRIFTS study
2019
Zhao, Ling | Zhang, Yu | Bi, Sining | Liu, Qifeng
Metal–organic framework (MOF)-based derivatives have attracted an increasing interest in various research fields. Here, we synthesized CeO₂–ZnO catalysts through the complete thermal decomposition of the Ce/MOF-5 precursor. The catalysts were characterized using XRD, FTIR, TG-DSC, SEM and H₂-TPR. It is found that the as-prepared CeO₂–ZnO is favorable for strengthening the interaction between Ce⁴⁺ and Zn²⁺. A significant improvement in the catalytic performance for C₃H₆-SCR of NO was found over the Ce-doped catalysts with the highest N₂ yield of 69.1% achieved over 5% CeO₂–ZnO. In situ DRIFTS and NO-TPD experiments demonstrated the formation of monodentate nitrates, bidentate nitrates, chelating nitrite, nitro compounds, nitrosyl and CₓHyOz species (enolic species and acetate) on the surface, followed by the formation of hydrocarbonate or carbonate as intermediates to directly generate N₂, CO₂ and H₂O.
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