Impacts of acid gases on mercury oxidation across SCR catalyst

摘要: Abstract A series of bench-scale experiments were completed to evaluate acid gases HCl, SO2, and SO3 on mercury oxidation across a commercial selective catalytic reduction (SCR) catalyst. The SCR catalyst was placed in simulated flue gas stream containing O2, CO2, H2O, NO, NO2, NH3, N2. added the either separately or combination investigate their interactions with over compositions represent medium-sulfur low- medium-chlorine coal that could bituminous subbituminous. experimental data indicated 5–50 ppm HCl enhanced within catalyst, possibly because reactive chlorine species formed through reactions. An addition 5 ppm resulted 45% compared only 4% when 1 ppm is gas. As concentration increased 50 ppm, 63% Hg reached. SO2 showed mitigating effect chlorination some degree, depending concentrations SO3, by competing against for adsorption sites. High levels (50 ppm), (2000 ppm), (50 ppm) deteriorate