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Korean Chemical Engineering Research,
Vol.42, No.2, 196-201, 2004
Vol.42, No.2, 196-201, 2004
구리첨착 ACF에 의한 NO의 분해
Decomposition of NO by Cu-impregnated ACFs
레이욘계 활성탄소섬유(KF-1500)에 구리를 첨착하고 반응관에 충전한 후 300-400 ℃에서 NO가스를 통과시키면서 촉매분해시켰다. NO가스의 주입농도는 1,300 ppm이다. 구리를 첨착하지 않았을 때는 NO가스를 거의 흡착하지 않았으나 구리를 5혹은 10 wt% 첨착시킨 활성탄소섬유는 400 ℃에서는 6시간 이상 200 ppm미만의 NO 농도를 유지하면서 효과적으로 분해시켰다. 구리는 활성탄소섬유의 미세공 입구 탄소에 첨착되며, 활성탄소섬유에 첨착된 구리 [ACF-C(Cu)]는 반응의 초기에는 [ACF-C(Cu2O)]가 되면서 NO를 N2로 환원시켰다. [ACF-C(Cu2O)]도 NO를 환원시켜 N2를 발생시키면서 [ACF-C(CuO)]가 되었다. 이러한 반응이 진행되는 동안 활성탄소섬유의 질량은 거의 변함이 없었으므로 첨착된 구리가 촉매로 작용하였다고 판단되며, 촉매 환원의 반응온도가 높을수록 가속되었다.
NO gas was decomposed by Cu-impregnated rayon based ACF in a column reactor at 300-400 ℃ in helium surrounding. Initial NO concentration was 1,300 ppm. The as received ACF adsorbed NO very little. However, NO was effectively decomposed by 5-10 wt% Cu-impregnated ACF a t 400 ℃. The concentration of NO was maintained less than 200 ppm for 6 hours in this system. Copper was impregnated at the entrance of micropores. Impregnation of Cu particles on ACF should be homogeneously distributed to increase the capacity of catalytic reduction of NO. The Cu-impregnated ACF-C(Cu) deoxydized NO to N2 and was reduced to ACF-C(Cu2O) in the initial stage. The ACF-C(Cu2O) also deoxidized NO to N2 and was reduced to ACF-C(CuO). There was little consumption of ACF in mass during the catalytic reduction of NO to N2 by copper. The catalytic reduction was accerelated by increasing the reaction temperature.
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