Catalytic Total Oxidation of SOFC Exhaust Gas on Cu-Mn Catalysts
CULLEN et. al. reported high conversion rate of SOFC exhaust gas using a La-Cu-Mn impregnated alumina catalyst and a Pt-Pd catalyst in series. In this work, Cu-Mn catalysts that are used in the oxidation of methane or carbon monoxide were tested for SOFC exhaust gas oxidation.
For determining the best ratio of Cu-Mn in catalysts, different ratios of La2O3-MnO-CuO/γ-Al2O3catalysts were prepared. The result shows approximtely 0.5 to 2 Cu/Mn ratio is the best composition for SOFC exhaust gas oxidation[Fig. 1].
Fig. 1. Conversion of CO(160℃), H2(240℃), CH4(460℃) with various Cu-Mn ratio.
Cu-Mn perovskite and spinel supported catalysts were also tested. The perovskite supported catalysts showed much higher activity than the spinel supported. This was especially so for the case of methane conversion; the perovskite supported catalysts showed similar performance to alumina supported. The methane conversion of reference, CP and MP were 53.1%, 55.1% and 56.3% at 500℃, respectively.
 Greg CULLEN, Jon P. Wagner, Georg Anfang, Chandra Ratnasamy, METHOD FOR REMOVING CO, H2 AND CH4 FROM AN ANODE WASTE GAS OF A FUEL CELL AND CATALYST SYSTEM USEFUL FOR REMOVING THESE GASES, US 2012/0128563 Al, 2012