Abstract
Abstract The reduction of NO with CO over the uranium oxide catalyst and its mixed catalysts with alkali metal oxide or alkaline earth metal oxide has been investigated using conventional flow and pulse reactors at temperatures of 250 to 450 °C under atmospheric pressure. The activity of the uranium oxide catalyst without any additive was higher than that of the Fe2O3 catalyst, although it was inferior to that of the CuO–Cr2O3 catalyst. The addition of alkali metal oxide or alkaline earth metal oxide to uranium oxide, particularly in the case of Cs2O or K2O, was effective in enhancing the catalyst activity. The W/F-conversion curves revealed that the reduction of NO to N2 proceeds consecutively, passing through N2O as a gas-phase intermediate. The reaction rates were formulated as r=kPCO1.0PNO0.4. The kinetic study suggested a redox reaction sequence. The oxidation states of the catalysts were discussed on the basis of X-ray diffractograms.
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