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Novel hollow microspheres MnxCo3−xO4 (x = 1, 2) with remarkable performance for low-temperature selective catalytic reduction of NO with NH3

  • Original Paper: Sol-gel and hybrid materials for energy, environment and building applications
  • Published:
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Abstract

Hollow microspheres MnCo2O4 and CoMn2O4 have been synthesized by a facile solvothermal route followed by pyrolysis of the carbonate counterparts and carbon microspheres, using carbon microspheres as the template. The NH3-selective catalytic reduction reaction was used to test the catalytic activity. The obtained hollow microspheres are composed of numerous primary particles with sizes of tens of nanometers, giving a porous shell. The obtained CoMn2O4 microsphere shows better low-temperature catalytic activity and N2 selectivity than MnCo2O4 microsphere in the NH3-selective catalytic reduction reaction. The X-ray photoelectron spectroscopy results demonstrate that CoMn2O4 microsphere has a relatively higher number content of Mn3+ and chemisorbed oxygen species. The temperature-programmed desorption by ammonia and in situ diffuse reflectance infrared Fourier transform spectroscopy results indicate that the CoMn2O4 microsphere possesses stronger Lewis acid strength than the MnCo2O4 microsphere. Additionally, the CoMn2O4 microsphere also presented outstanding stability, H2O resistance and SO2 tolerance.

Graphical Abstract

The NH3-SCR reaction mechanism is proposed that NH3(g) is adsorbed on the surface of Lewis acid sites and Brønsted acid sites in the shape of NH4 + ions and gaseous NH3. Besides, the adsorption of NO could exist in the form of gaseous or oxide ions NO2 − on the surface of catalysts.The adsorbed NH3 species could react with NO2 − species easily to produce NH4NO2, which subsequently to produce the innocuous N2 and H2O.

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Acknowledgments

This work was supported by the National Natural Science Foundtion of China (Grant No. 21377061, 81270041), Independent Innovation fund of Tianjin University (2015XRG-0020 and 2016XJ-0006), and by Natural Science Foundation of Tianjin (Grant No. 15JCYBJC48400, 16YFZCSF00300 and 15JCZDJC41200).

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Authors and Affiliations

  1. Department of Chemistry, Tianjin University, Tianjin, 300072, People’s Republic of China

    Yi Li & Yanping Li

  2. College of Environmental Science and Engineering, Nankai University, Tianjin, 300071, People’s Republic of China

    Qiang Shi, Mingying Qiu & Sihui Zhan

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  1. Yi Li
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  2. Yanping Li
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  3. Qiang Shi
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  4. Mingying Qiu
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  5. Sihui Zhan
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Correspondence to Sihui Zhan.

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Li, Y., Li, Y., Shi, Q. et al. Novel hollow microspheres MnxCo3−xO4 (x = 1, 2) with remarkable performance for low-temperature selective catalytic reduction of NO with NH3 . J Sol-Gel Sci Technol 81, 576–585 (2017). https://doi.org/10.1007/s10971-016-4208-8

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  • DOI: https://doi.org/10.1007/s10971-016-4208-8

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