Catalytic Carbon Monoxide Oxidation over Potassium-Doped Manganese Dioxide Nanoparticles Synthesized by Spray Drying

  • Kevin Ollegott
  • Niklas Peters
  • Hendrik Antoni
  • Martin MuhlerEmail author
Special Issue: In Recognition of Professor Wolfgang Grünert's Contributions to the Science and Fundamentals of Selective Catalytic Reduction of NOx


Manganese oxides are promising catalysts for the oxidation of CO as well as the removal of volatile organic compounds from exhaust gases because of their structural versatility and their ability to reversibly change between various oxidation states. MnO2 nanoparticles doped with Na+ or K+ were synthesized by a semi-continuous precipitation method based on spray drying. Specific surface area, crystallite size, and morphology of these particles were predominantly determined by the spray-drying parameters controlling the quenching of the crystallite growth, whereas thermal stability, reducibility, and phase composition were strongly influenced by the alkali ion doping. Pure α-MnO2 was obtained by K+ doping under alkaline reaction conditions followed by calcination at 450 °C, which revealed a superior catalytic activity in comparison to X-ray amorphous or Mn2O3-containing samples. Thus, the phase composition is identified as a key factor for the catalytic activity of manganese oxides, and it was possible to achieve a similar activation of a K+-doped X-ray amorphous catalyst under reaction conditions resulting in the formation of crystalline α-MnO2. The beneficial effect of K+ doping on the catalytic activity of MnO2 is mainly associated with the stabilizing effect of K+ on the α-MnO2 tunnel structure.


Manganese dioxide Spray drying CO oxidation Alkali ion doping 


Funding information

This research was supported by the German Research Foundation within the Collaborative Research Center SFB 1316/1 “Transient atmospheric pressure plasmas—from plasmas to liquids to solids.” Kevin Ollegott was supported by the Fonds der Chemischen Industrie.

Supplementary material

40825_2019_125_MOESM1_ESM.docx (789 kb)
ESM 1 (DOCX 789 kb)


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Laboratory of Industrial ChemistryRuhr-University BochumBochumGermany

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