Abstract
In order to remove NOx from multiple sources with complex operating conditions, catalysts with excellent low-temperature activity and strong water and sulfur resistance are in high demand. Herein, we designed an efficient inter-connected porous CuOx-NbOx/kit-CeO2 catalyst for the selective catalytic reduction of NOx with NH3 (NH3-SCR). The catalyst exhibited relatively outstanding NH3-SCR activity in the low temperature range (100–300 °C) and showed remarkable stability and excellent resistance to SO2 and H2O. The inter-connected porous structure allowed the adsorption and diffusion of gaseous reactants, meanwhile, the interaction between Cu, Nb and Ce enhanced the surface acidity, redox properties and surface oxygen activity of the CuOx-NbOx/kit-CeO2 catalyst. On the basis of in situ DRIFTs studies, Eley-Rideal process was expected to be the dominant pathway with the coexistence of Langmuir–Hinshelwood mechanism at 250 °C.
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