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The Effect of Promoter on the SO2-resistance of Fe/zeolite Catalysts for Selective Catalytic Reduction of NO with Ammonia
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  • Journal title : Clean Technology
  • Volume 21, Issue 3,  2015, pp.153-163
  • Publisher : The Korean Society of Clean Technology
  • DOI : 10.7464/ksct.2015.21.3.153
 Title & Authors
The Effect of Promoter on the SO2-resistance of Fe/zeolite Catalysts for Selective Catalytic Reduction of NO with Ammonia
Ha, Ho-Jung; Choi, Joon-Hwan; Han, Jong-Dae;
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 Abstract
The effects of H2O and residue SO2 in flue gases on the activity of the Fe/zeolite catalysts for low-temperature NH3-SCR of NO were investigated. And the addition effect of Mn, Zr and Ce to Fe/zeolite for low-temperature NH3-SCR of NO in the presence of H2O and SO2 was investigated. Fe/zeolite catalysts were prepared by liquid ion exchange and promoted Fe/zeolite catatysts were prepared by liquid ion exchange and doping of Mn, Zr and Ce by incipient wetness impregnation. Zeolite NH4-BEA and NH4-ZSM-5 were used to adapt the SCR technology for mobile diesel engines. The catalysts were characterized by BET, X-ray diffraction (XRD), SEM/EDS, TEM/EDS. The NO conversion at 200 ℃ over Fe/BEA decreased from 77% to 47% owing to the presence of 5% H2O and 100 ppm SO2 in the flue gas. The Mn promoted MnFe/BEA catalyst exhibited NO conversion higher than 53% at 200 ℃ and superior to that of Fe/BEA in the presence of H2O and SO2. The addition of Mn increased the Fe dispersion and prevented Fe aggregation. The promoting effect of Mn was higher than Zr and Ce. Fe/BEA catalyst exhibited good activity in comparison with Fe/ZSM-5 catalyst at low temperature below 250 ℃.
 Keywords
Selective catalytic reduction;NO;NH3;Fe;Zeolite;
 Language
Korean
 Cited by
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