화학공학소재연구정보센터
Chemical Engineering Journal, Vol.369, 26-34, 2019
Effect of preferential exposure of anatase TiO2 {001} facets on the performance of Mn-Ce/TiO2 catalysts for low-temperature selective catalytic reduction of NOx with NH3
Titanium dioxide with preferentially exposed {0 0 1} facets (TiO2-NS) was synthesized by hydrothermal method using HF as a crystal plane regulator. The obtained TiO2-NS was used as the carrier of the low temperature SCR catalysts Mn-Ce/TiO2-NS which was prepared by impregnation method. Meanwhile, Mn-Ce/TiO2-NP catalyst was prepared as a comparison by the same method using titanium dioxide with priority to {1 0 1} facets (TiO2-NP) as the carrier. The effect of preferential exposure of anatase TiO2 {0 0 1} facets on the low-temperature selective catalytic reduction performance of Mn-Ce/TiO2 was studied. The support TiO2 (TiO2-NS and TiO2-NP) and the SCR catalysts were characterized by means of Scanning electron microscopy (SEM), Transmission electron microscope (TEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface measurement, X-ray photoelectron spectroscopy (XPS), Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) and NH3-temperature programmed desorption (NH3-TPD). The results showed that the preferentially exposed {0 0 1} facets of TiO2 could increase the specific surface area and the concentration of surface adsorbed oxygen of the catalyst, and enhance the surface acidity. The denitration test indicated that Mn-Ce/TiO2-NS catalyst showed excellent NO conversion. In particular, the catalytic efficiency of Mn-Ce/TiO2-NS was about 30% higher than that of Mn-Ce/TiO2-NP in the low temperature window within 100-160 degrees C.