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Korean Journal of Chemical Engineering

, Volume 36, Issue 12, pp 1991–1999 | Cite as

Precursor and dispersion effects of active species on the activity of Mn-Ce-Ti catalysts for NO abatement

  • Xiaobo WangEmail author
  • Jie Zhou
  • Caojian Jiang
  • Jia WangEmail author
  • Keting Gui
  • Hywel Rhys Thomas
Catalysis, Reaction Engineering
  • 2 Downloads

Abstract

Mn-Ce-Ti catalysts were prepared by different precursors (including manganese nitrate, manganese acetate, and manganese chloride) and used for selective catalytic reduction (SCR) of NO with ammonia. The relationships among the structure, physicochemical properties, and catalytic activity were explored by N2 adsorption/desorption, X-ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR), NH3-temperature programmed desorption (NH3-TPD), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HR-TEM), scanning electron microprobe (SEM) and energy dispersive spectroscopy (EDS) techniques. The results show that the different Mn precursors play important roles in the catalytic activity. The Mn-Ce-Ti(N) catalyst synthesized by manganese nitrate precursor exhibits the best catalytic activity, while the Mn-Ce-Ti(C) and Mn-Ce-Ti(Cl) catalyst prepared by manganese acetate and manganese chloride, respectively, exhibit relatively low catalytic activity. The manganese nitrate precursor could promote the specific surface area and redox ability, enhance the amounts of Brønsted and Lewis acid sites, and enrich the surface active species such as Mn4+, Ce3+ and surface chemisorbed oxygen of the catalyst, all of which will contribute to the SCR performance. Moreover, the Mn-Ce-Ti(N) catalyst possesses highly dispersed and uniform surface active species, which will result in the optimal physicochemical properties and superior catalytic performance.

Keywords

Precursor Effect Active Species Dispersion NH3-SCR NO Abatement 

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Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (51276039), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (17KJB610005), the Jiangsu Government Scholarship for Overseas Studies (JS-2018), and a project funded by Nanjing Xiaozhuang University (2016NXY41).

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Precursor and dispersion effects of active species on the activity of Mn-Ce-Ti catalysts for NO abatement

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Copyright information

© The Korean Institute of Chemical Engineers 2019

Authors and Affiliations

  1. 1.School of Environmental ScienceNanjing Xiaozhuang UniversityJiangsuChina
  2. 2.Geoenvironmental Research Centre, School of EngineeringCardiff UniversityCardiffUK
  3. 3.College of Chemical EngineeringNanjing Forestry UniversityJiangsuChina
  4. 4.School of Energy and EnvironmentSoutheast UniversityJiangsuChina

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