A comparative study on the Mn/TiO2 -M(M = Sn, Zr or Al) Ox catalysts for NH3 -SCR reaction at low temperature

Environmental Technology
Yaping ZhangChangcheng Zhou

Abstract

A series of TiO2-M(M = Sn, Zr or Al) Ox were prepared and manganese oxide (MnOx) was supported on the carrier by the traditional impregnation method for low-temperature selective catalytic reduction (SCR) of NOx with ammonia as a reductant. The obtained catalysts were characterized by XRD, BET, high-resolution transmission electron microscope (HRTEM), H2-TPR, NH3-TPD, X-ray photoelectron spectroscopy (XPS) and in situ Fourier-transform infrared (FT-IR) and their catalytic activities for NOx reduction with NH3 in the presence of SO2 were investigated comparatively. The results showed that the highest NOx conversion of over 90% could be obtained with the Mn/Ti-Sn catalyst at a wide range of temperature window of 150-270°C. The combination of characterization techniques, such as BET, XRD and HRTEM, revealed that manganese oxides were well dispersed on Ti-Sn. H2-TPR suggested that Ti-Sn and Ti-Zr supports could enhance the reduction ability of catalysts. Accordingly, Mn/Ti-Al exhibited worse activity at low temperature. XPS results were in good agreement with H2-TPR results, and Mn/Ti-Sn had more surface-reducible species of Mn4+ ions and more surface-adsorbed oxygen species, which was conducive to SCR reaction. The in situ FT-IR s...Continue Reading

References

Nov 23, 2010·Environmental Science & Technology·Liang ChenMaofa Ge
Apr 5, 2012·Gastroenterology Nursing : the Official Journal of the Society of Gastroenterology Nurses and Associates·Meihong DingMeihfeng Wang
May 23, 2014·ACS Applied Materials & Interfaces·Lei ChenDuan Weng
Jul 22, 2014·ACS Applied Materials & Interfaces·Zhiming LiuSeong Ihl Woo

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Methods Mentioned

BETA
transmission electron microscopy
electron diffraction
X-ray

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