석탄화력발전소 저온영역에서 조촉매 성분 및 함량에 따른 Metal type SCR 코팅 촉매 성능 연구 = De-NOx performance of Metal type SCR catalyst as a function of promotor composition and content in the low temperature zone of coal-fired power plants

다국어 초록 (Multilingual Abstract)

As NOx emission regulations are tightening, conventional SCR catalysts installed in coal-fired power plants cannot satisfy the regulations. In this study, NOx was reduced using a metal substrate catalyst with a high bulk surface area and high thermal responsiveness at low temperatures. The catalytic slurries were prepared with 14wt% V and different contents of Co, Ce, and W. The de-NOx performances of the prepared catalysts were investigated using a laboratory-scale atmospheric pressure reactor. The catalysts were characterized by air jet erosion, pressure drop test, Brunauer-Emmett-Teller surface area measurements, x-ray fluorescence spectroscopy, and scanning electron microscopy. At 180°C, the catalysts with Co and Ce exhibited lower de-NOx performance than those prepared with V alone. The catalyst with 8 wt. % W showed 4.6% higher de-NOx performance than the catalyst with V alone. A comparison of the pressure drop with the commercial honeycomb catalyst revealed the CPSI of the metal substrate to be twice as high, but the pressure drop was lower than the commercial honeycomb catalyst, and the de-NOx performance was better. Overall, the SCR catalyst coated on a metal substrate is a new type of catalyst that can be applied to various fields where the SCR process is applied.

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