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The Manganese-Based Zirconium (Zr) and Chromium (Cr) Polymeric Pillared Interlayered Montmorillonite for the Low-Temperature Selective Catalytic Reduction of NOx by Ammonia (NH3) in Metallurgical Sintering Flue Gas

  • Zhicheng Han
  • Qingbo YuEmail author
  • Kaijie Liu
  • Huaqing Xie
  • Qin Qin
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

The manganese-based Zr and Cr polymeric pillared interlayered montmorillonite (Mn/Zr-Cr-PILM) with various Zr/Cr ratio as carrier supported MnOx were used in the selective catalytic reduction of NOx by NH3 (NH3-SCR) in metallurgical sintering flue gas. The X-ray diffraction (XRD), N2 adsorption–desorption isotherm, and ammonia temperature-programmed desorption (NH3-TPD) were used to analyze the catalyst physicochemical property. The Mn/Zr-Cr-PILM (1:3) had the highest NOx conversion between 140 and 180 °C compared with other catalysts. This was due to the large specific surface area and a large amount of Lewis acid sites provided more reaction platform and more adsorption sites for the catalytic reaction. However, as the proportion of Cr increased in Mn/Zr-Cr-PILM, the N2 selectivity of the catalyst decreased rapidly with the increasing temperature, except for Mn/Zr-Cr-PILM (3:1). It may be that the entry of chromium oxide into the zirconium oxide crystal phase in Mn/Zr-Cr-PILM (3:1) inhibited the production of N2O for increasing the N2 selectivity.

Keywords

Low-temperature NH3-SCR Pillared montmorillonite Excess oxygen 

Notes

Acknowledgements

This research was supported by National Key Research and Development of China (2017YFB0603603) and National Natural Science Foundation of China (51576035).

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Zhicheng Han
    • 1
  • Qingbo Yu
    • 1
    Email author
  • Kaijie Liu
    • 1
  • Huaqing Xie
    • 1
  • Qin Qin
    • 1
  1. 1.School of MetallurgyNortheastern UniversityHeping District, ShenyangPeople’s Republic of China

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