Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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K and Cs Doped Ag/Al2O3 Catalyst for Selective Catalytic Reduction of NOx by Methane

  • Rao, Komateedi N. (Interfacial Engineering Research Centre, Korea Institute of Science and Technology) ;
  • Yu, Chang-Yong (Interfacial Engineering Research Centre, Korea Institute of Science and Technology) ;
  • Lack, Choi-Hee (Division of Materials Science and Engineering, Pukyong National University) ;
  • Ha, Heon-Phil (Interfacial Engineering Research Centre, Korea Institute of Science and Technology)
  • Received : 2011.09.08
  • Accepted : 2011.10.20
  • Published : 2011.12.28
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Abstract

In the present study, potassium and caesium doped Ag/$Al_2O_3$ catalysts were synthesized by simple wet impregnation method and evaluated for selective catalytic reduction (SCR) of NOx using methane. TEM analysis and diffraction patterns demonstrated the finely dispersed Ag particles. BET surface measurements reveal that the prepared materials have moderate to high surface area and the metal amount found from ICP analysis was well matching with the theoretical loadings. The synthesized K-Ag/$Al_2O_3$ and Cs-Ag/$Al_2O_3$ catalysts exhibited a promotional effect on deNOx activity in the presence of $SO_2$ and $H_2O$. The long-term isothermal studies at $550^{\circ}C$ under oxygen rich condition showed the superior catalytic properties of the both alkali promoted samples. The crucial catalytic properties of materials are attributed to NO adsorption properties detected by the NO TPD.

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