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DeNOx catalysts composed of Mn, Cu and TiO2 were prepared and tested for NH3-SCR. The performance of each catalyst was studied for the NOx removal efficiency while changing the calcination temperature, reaction time, and oxygen concentration. The hydrogen conversion efficiency of a calcined catalyst was measured at the H2-TPR system. The change in the specific surface area of catalyst according to the calcination temperature was analyzed. As a result, the proper calcination temperature was approximately 300°C. If the calcination temperature is increased to 500°C, the NOx removal efficiency of Mn and Cu constituents is largely decreased at the low temperature range. Oxygen in flue gas is an important parameter in the SCR reaction and optimal oxygen concentration is approximately 8 vol.%.

NO<sub>x</sub> removal of Mn-Cu-TiO<sub>2</sub> catalyst for the calcination and oxygen concentration conditions