Topic
Selective catalytic reduction
About: Selective catalytic reduction is a research topic. Over the lifetime, 10502 publications have been published within this topic receiving 226291 citations.
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TL;DR: In this article, the poisoning effect of Na and K on Mn/TiO2 was investigated based on experimental and theoretical study, and it was found that K had a stronger poisoning effect than that of Na.
82 citations
TL;DR: This study shows the feasibility of a single-step process integrating low-temperature SCR and Hg(0) oxidation from the coal combustion flue gas.
82 citations
TL;DR: In this article, the role of tungsten species in electrons transfer over the ternary VWTi catalysts was investigated and it was shown that WO3 species improved the electrons transfer of the catalysts to facilitate the formation of reduced V2O5/TiO2 catalyst.
Abstract: Promotional effect of WO3 on the formation of O2− over V2O5/TiO2 catalyst for selective catalytic reduction of NO with NH3 was studied. The aim of this novel design was to investigate the role of tungsten species in electrons transfer over the ternary VWTi catalysts. Analysis by XRD, XPS, PL and EPR showed that WO3 species improved the electrons transfer of the catalysts to facilitate the formation of reduced V2O5 that was important to improve the formation of superoxide ions. This property was remarkably different from that of the VTi catalyst and it could contribute to a new understanding of the catalytic behavior of VWTi catalyst in low-temperature SCR processes.
82 citations
TL;DR: In this article, a small amount of noble metal (Pt, Rh or Pd) was added to the Fe-ZSM-5 catalyst to reduce the reaction temperature to 250-350 °C.
Abstract: We have reported previously the excellent performance of Fe-exchanged ZSM-5 for selective catalytic oxidation (SCO) of ammonia to nitrogen at high temperatures (e.g., 400-500 °C). The present work indicates that the reaction temperature can be decreased to 250-350 °C when a small amount of noble metal (Pt, Rh or Pd) is added (by both doping and ion exchange) to the Fe-ZSM-5. The SCO activity follows the order: Pt/Fe-ZSM-5 > Rh/Fe-ZSM-5 > Pd/Fe-ZSM-5. The noble metal promoted Fe-ZSM-5 catalysts also show higher activity for NH3 oxidation than Ce-exchanged Fe-ZSM-5 at low temperatures. On the Pt promoted Fe-ZSM-5, near 100% of NH3 conversion is obtained at 250 °C at a high space velocity (GHSV = 2.3 × 105 h-1) and nitrogen is the main product. The presence of H2O and SO2 decreases the SCO performance only slightly. This catalyst is a good candidate for solving the ammonia slip problem that plagues the selective catalytic reduction (SCR) of NO with ammonia in power plants.
82 citations
TL;DR: In this article, the authors investigated the adsorption and co-adsorption of NH 3, NO and O 2 on catalysts by in situ FTIR spectroscopy and found that the presence of cobalt and cerium oxides increased the number of acid and redox sites.
82 citations