In this study, we investigated the cause of the decrease in activities of VOx/TiO2 SCR catalyst used for the burner reactor at a scale of 150000 Nm3/hr using X-ray diffraction (XRD), brunauer-emmett-teller (BET), atomic emission spectroscopy inductively coupled plasma (AES ICP), H2 temperature programmed reduction (H2-TPR), and NH3 temperature programmed desorption (NH3-TPD) analysis. Since the crystallization of the VOx and phase transition of TiO2 did not occur, it was concluded that the catalyst was not deactivated by the thermal effect. In addition, from the elemental analysis showing that a large quantity of calcium was detected but not sulfur, the deactivation process of the VOx/TiO2 SCR catalyst was mainly caused by Ca but not by SO2. The calcium was also found to decrease the catalytic activity by means of reducing NH3 adsorption.

본 연구에서는, 실제 150000 Nm3/hr 규모의 연소로에서 운전된 VOx/TiO2 SCR 촉매의 활성저하 원인을 규명하고자XRD, BET, AES ICP, H2-TPR, NH3-TPD 분석을 수행하였다. TiO2의 상전이 및 VOx의 결정화가 발생하지 않았기 때문에 열에 의한 촉매의 활성저하는 없는 것으로 나타났다. 반면, 성분 분석결과 S의 함량이 검출되지 않고 Ca이 다량검출됨에 따라 SO2에 의한 피독이 아닌 Ca에 의한 피독이 발생하였음을 확인하였으며 이러한 Ca의 피독은 NH3의흡착량을 감소시켜 반응활성을 감소시키는 것으로 나타났다.