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A laboratory study of Hg oxidation catalyzed by SCR catalysts

A laboratory study of Hg oxidation catalyzed by SCR catalysts. Karin Madsen on 05.10.2010 at CHEC Annual Day Anker Degn Jensen Joakim Reimer Thøgersen Flemming Frandsen. Outline. Background Laboratory Study Conclusions. Background. 1930 tons of mercury was emitted in 2005 (Pacyna, 2010)

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A laboratory study of Hg oxidation catalyzed by SCR catalysts

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  1. A laboratory study of Hg oxidation catalyzed by SCR catalysts Karin Madsen on 05.10.2010 at CHEC Annual Day Anker Degn Jensen Joakim Reimer Thøgersen Flemming Frandsen

  2. Outline Background Laboratory Study Conclusions

  3. Background 1930 tons of mercury was emitted in 2005 (Pacyna, 2010) 45% comes from combustion of fossil fuels Existing air pollution control devices offers an economically feasible option for mercury control Mercury species in flue gases from power plants Hg0 : Volatile, difficult to capture Hg2+: Water soluble, can be captured in a wet scrubber Hgp : Can be captured in particulate control devices Mercury speciation is highly dependent on coal type/rank and operating conditions

  4. Mercury oxidation and the SCR Mercury is oxidized by halogens in the flue gas (Potential) net reaction Hg0 + 2 HCl + 1/2 O2 = HgCl2 + H2O SCR catalysts for NOx-control also have catalytic activity on the mercury oxidation The combination SCR + wet FGD can offer >90% mercury capture

  5. Laboratory Setup at Topsoe A/S

  6. Mercury oxidation and Chlorine

  7. Mercury Oxidation and Ammonia

  8. Mercury Oxidation: Laboratory versus Pilot-scale data

  9. Conclusion: Close Gap between Laboratory and Pilot-Scale Data Difference in gas matrix Laboratory Simulated flue gas containing Hg0, O2, H2O, NH3, HCl and N2 Pilot Real flue gas from subbituminous coal combustion including NO, SO2, and fly ash Factor 10-20 difference in catalyst activity must be due to difference in gas matrix Future work involves testing of more complex gas matrices including NO and SO2

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