SCR (Selective Catalytic Reduction)
SCR (Selective Catalytic Reduction) :
A general term for processes which destroy nitrogen oxides in gaseous effluents by reacting them with ammonia in the presence of a catalyst: 4NO + 4NH3 + O2 + 4N2 + 6H2O and 6NO2 + 8NH3 + 7N2 + 12H2O. For clean gaseous effluents, such as those from nitric acid plants, the preferred catalyst is mordenite. For flue-gases containing fly ash, the preferred catalyst is titania-vanadia. (Check source for accuracy of chemical formula)
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