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박종수,홍성창,도동섭 ( Jong Soo Park,Sung Chang Hong,Dong Sup Doh ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.6
The activity of natural manganese dioxide(NMD), electrolytic manganese dioxide(EMD), and metal oxide (MeO/NMD composite catalysts for CO oxidation has been studied as a function of temperature and metal oxide wt% in a differential plug flow reactor system in a temperature range 300-673 K and under atmospheric pressure condition. The MeO/NMD composite catalysts consisted of NMD and metals such as Pt, Pd, Ru, Au, Ag, Cu, Zn, CuCr prepared by wet impregnation method and calcination in air. It was found from the experiment that NMD could effectively be utilized as a catalyst as well as a support for CO oxidation. By the impregnation of metal oxides on NMD, the oxidation activity of CO was increased, and palladium oxide showed the highest increase among other metal oxides. The activation energy of MeO/NMD composite catalysts decreased with the increase of Me0 content and the activation energy of NMD was lower than that of EMD.
유동층반응기에서 MeO/NMD를 이용한 저농도 연소가능 오염물의 제거
박태성,정순관,윤재성,홍성창,도동섭 ( Tae Sung Park,Soon Kwan Jeong,Jae Sung Yun,Sung Chang Hong,Dong Sup Doh ) 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.5
For the removal of combustible pollutant gas at low concentration, the experiment about oxidation of CH₄, C_6H_6, C₂H_5OH, CO, was carried out using platinum, paladium-impregnated NMD(Natural Manganese Dioxide) in the fluidized bed reactor for several variables. At the same flow velocity the effect of particle size on conversion appeared most efficient in the size of 0.359 ㎜. The oxidation was excellent at low flow velocity and large aspect ratio because of the effect of residence time of reactant. Also the, noble metal-impregnated catalyst oxidated VOCs at more low temperature than catalyst without impregnation. For methane oxidation ability of PdO/NMD decreased in the reason that experimental temperature was so high that the structural transformation was caused.