Korean Journal of Chemical Engineering, Vol.27, No.1, 49-54, 2010
NO oxidation over supported cobalt oxide catalysts
NO oxidation was conducted over cobalt oxides supported on various supports such as SiO2, ZrO2, TiO2, and CeO2. The N2 physisorption, an inductively coupled plasma-atomic emission spectroscopy (ICP-AES), X-ray diffraction (XRD), NO chemisorptions, the temperature-programmed desorption (TPD) with a mass spectroscopy after NO or CO chemisorptions were conducted to characterize catalysts. Among tested catalysts, Co3O4 supported on ceria with a high surface area showed the highest catalytic activity. This catalyst showed superior catalytic activity to unsupported Co3O4 with a high surface area and 1 wt% Pt/γ-Al2O3. For ceria-supported Co3O4, the catalytic activity, the NO uptake at 298 K and the dispersion of Co3O4 increased with increasing the surface area of CeO2. The active participation of the lattice oxygen in NO oxidation could not be observed. On the other hand, the lattice oxygen participated in the CO oxidation over the same catalyst. The deactivation was observed over Co3O4/CeO2 and 1 wt% Pt/γ-Al2O3 in the presence of SO2 in a feed. 1 wt% Pt/γ-Al2O3 was deactivated by SO2 more rapidly compared with Co3O4/CeO2.
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