Low-temperature SCR of NO with NH3 over noble metal promoted Fe-ZSM-5 catalysts
نویسندگان
چکیده
We have reported previously the excellent performance of Fe-exchanged ZSM-5 for selective catalytic reduction (SCR) of NO with ammonia at high temperatures (300–400 C). In this work, we found that the reaction temperature could be decreased to 200– 300 C when a small amount of noble metal (Pt, Rh, or Pd) was added to the Fe-ZSM-5. The SCR activity follows the order Pt/FeZSM-5 > Rh/Fe-ZSM-5 > Pd/Fe-ZSM-5 at 250 C. On the Pt promoted Fe-ZSM-5, 90% NO conversion was obtained at 250 C at GHSV = 1.1 · 10 h. Moreover, the noble metal improved the resistance to H2O and SO2. The presence of H2O and SO2 decreased the SCR performance only very slightly.
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