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Low-temperature selective catalytic reduction of NO with NH3 over Mn–Ce–Ox/TiO2: a comparison between catalyst preparation methods

  • Original Paper: Sol–gel and hybrid materials for catalytic, photoelectrochemical and sensor applications
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Abstract

Three Mn–Ce–Ox/TiO2 mixed oxides (MCT) were prepared by sol–gel (SG), citric acid complexing (CA), and co-precipitation (CP) methods and used as catalysts for selective catalytic reduction of NO with NH3 (NH3-SCR) at low temperatures (75–200 °C). The physicochemical properties of the prepared catalysts were investigated by N2 adsorption, X-ray diffraction (XRD), temperature-programmed reduction by H2 (H2-TPR), adsorption of NH3 and NO followed by temperature-programmed desorption (NH3/NO-TPD), X-ray photoelectron spectroscopy (XPS), and in situ diffuse-reflectance infrared Fourier transform (DRIFT) spectroscopy. The results show that both the low-temperature de-NOx activity and the resistance to SO2 poisoning of the Mn–Ce–Ox/TiO2 catalyst decrease in the order of MCT-CP > MCT-SG > MCT-CA. These disparities can be mainly attributed to the difference in specific surface area, fractions of Mn4+ (Mn4+/(Mn2++Mn3++Mn4+)) and surface adsorbed oxygen (surface adsorbed oxygen/(surface adsorbed oxygen + lattice oxygen)) species, and the adsorption capacity for NH3 and NO of the different catalysts.

The effect of preparation methods (sol–gel, citric acid complexing, and co-precipitation) on the performance of Mn–Ce–Ox/TiO2 catalyst was investigated. The catalyst prepared by co-precipitation exhibits higher low-temperature activity and better SO2 resistance than the counterparts prepared by the other two methods.

Highlights

  • Mn–Ce–Ox/TiO2 catalysts were prepared by sol–gel, citric acid complexing, and co-precipitation.

  • The catalyst prepared by co-precipitation exhibits the highest activity for NH3-SCR of NO.

  • The catalyst prepared by co-precipitation exhibits the best tolerance to SO2 poisoning.

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Acknowledgements

This work was financially supported by the Alliance Project of Shanghai City in China (No. LM201641).

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Authors and Affiliations

  1. School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai, 201418, PR China

    Mengxi Chao, Dongsen Mao, Gehua Li, Gang Li, Jun Yu & Xiaoming Guo

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  1. Mengxi Chao
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  2. Dongsen Mao
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  3. Gehua Li
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  4. Gang Li
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Correspondence to Dongsen Mao or Jun Yu.

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Chao, M., Mao, D., Li, G. et al. Low-temperature selective catalytic reduction of NO with NH3 over Mn–Ce–Ox/TiO2: a comparison between catalyst preparation methods. J Sol-Gel Sci Technol 95, 332–343 (2020). https://doi.org/10.1007/s10971-020-05268-1

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