코로나/촉매 일체형 시스템의 탈질특성에 관한 연구

Abstract

This study was carried out to investigate the reaction characteristics of corona/catalyst hybrid <TEX>$DeNO_x$</TEX> process. The experiments were performed by using the multi-staged pin-to-hole type corona reactor which is enable to control the pin-to-hole gap and to insert the catalyst. Also, used for this study, were catalysts which commercially used Pt, Pd and <TEX>$TiO_2$</TEX>, and oxygen and hydrocarbon (<TEX>$C_2H_4$</TEX>) as reagents. In the syn-gas test, at high temperatures in the range of <TEX>$100{\sim}200^{\circ}C$</TEX>, the corona-only <TEX>$DeNO_x$</TEX> process did not reduce the <TEX>$NO_x$</TEX> concentration effectively. However in the presence of ethylene and oxygen as reagents, the <TEX>$NO_x$</TEX> removal efficiency was better at these high temperatures than corona-only <TEX>$DeNO_x$</TEX> process. In addition, coronal catalyst hybrid process with <TEX>$TiO_2$</TEX> showed more efficiency of <TEX>$NO_x$</TEX> removal than Pt and Pd catalyst, because the <TEX>$TiO_2$</TEX> catalyst was more active than Pt and Pd catalyst to converse the <TEX>$NO_2$</TEX> to <TEX>$HNO_3$</TEX>. Furthermore, at the condition of real diesel exhaust gas, the <TEX>$DeNO_x$</TEX> efficiency of corona/catalyst hybrid process was not good at higher reaction temperature and plasma density.