The Selective Non-Catalytic Reduction Reaction of NO x Using Urea Solution in a Flow Reactor

The effect of reaction temperature, NSR(Normalized Stoichiometric Ratio), gas residence time, surfactant spe- cies on the reduction reaction of NO x with urea solution have been determined in a flow reactor. The maximum conversion of NO x reduction by urea solution appears about 950-1,000 o C and increases with increasing the gas residence time. Conversion of NOx reduction increases with increasing NSR up to 1.5 and then remains constant at 950 o C. The addition of linear alkyl- benzen sulfonate(LAS) into urea solution enhances the conversion of NO x reduction at lower temperature below 800 o C and the temperature window showing the NOx removal efficeiny above 70% is widen to 800-1,000 o C. Addition of α-olefin sulfonate and coconut oil also shows the reduction of the optimum temperature and the widening of temperature window for NO x reduction.