Abstract
Monometallic (V/TiO2 and Mo/TiO2) and bimetallic (V-Mo/TiO2) catalysts were prepared for selective catalytic reduction (SCR) of NOx with NH3 at low temperatures (100–300 °C). The effect of MoOx on the dispersion of vanadia with different V2O5 loadings was investigated on the basis of X-ray diffraction (XRD), inductively coupled plasma optical emission spectrometry (ICP-OES), N2 adsorption–desorption, Raman spectroscopy, ultraviolet–visible (UV–Vis) spectroscopy, X-ray photoelectron spectroscopy (XPS), H2 temperature-programmed reduction (H2-TPR) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). As the molybdenum precursor, NH4Mo7O24 increased the solution acidity and promoted polymerization of VOx in liquid phase. At a low vanadia loading, polymerization of VOx, the adsorption rate of NH3 and transformation of active intermediate species NH2 were enhanced by adding MoOx, while at a high vanadia loading, the steric hindrance became dominant leading to the formation of crystalline V2O5 and MoO3 and caused decline in SCR activity.
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