Structure and properties of amorphous CeO2@TiO2 catalyst and its performance in the selective catalytic reduction of NO with NH3

Abstract

Amorphous CeO2@TiO2 catalyst was prepared by spontaneous deposition method and characterized by XRD, Raman spectra, TEM, N2 physisorption, H2-TPR, NH3-TPD and FT-IR; its performance in the selective catalytic reduction (SCR) of NO with NH3 was investigated. The results show that there is a strong interaction between Ce and Ti which are combined at atomic level. In comparison with the crystal CeO2/TiO2 catalyst prepared by impregnation, the amorphous CeO2@TiO2 catalyst exhibits larger surface area and pore volume, excellent redox ability and acidity, and outstanding catalytic performance in SCR. Over the CeO2@TiO2 catalyst, the conversion of NO reaches 80% at 175°C and retains 96.0%–99.4% at 200–400°C. Moreover, the amorphous CeO2@TiO2 catalyst also shows strong resistance to H2O and SO2 poisoning.