Effects of O2 and CO on the Reduction of NO with NH3 over Cu-alumina Catalyst

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The catalytic reduction of NO with NH3 has been studied over Cu-alumina catalyst. Furthermore, effects of O2 and CO on the reaction have been investigated NO is reduced easily by NH3. The surface reaction of NO with NH3 seems to proceed mainly according to eq.(1) and the decomposition of NH3 is no more than a few percent. 4NH3+6NO=5N2+6H2O (1) When 10 vol‰ of O2 is present in the NO (500 ppm) NH3 (650 ppm) N2 balance system, NO conversion decreases and the oxidation of NO becomes remarkable with the rise of temperature. When 2.0 vol ‰ of CO is added to the NO (500 ppm)-NH3 (500 ppm)-O2 (10 vol ‰)-N2 balance system, CO is easily oxidized above 200°C and the CO2 formed shows no significant influence on the NO-NH3-O2-N2 balance system. NO conversion is more depressed and the oxidation of NO becomes more remarkable when CO is present. The amount of NH3 adsorbed on the Cu-alumina catalyst is about 4.0 x 10-4 mol/g cat. The value decreases to quarter when 0.3-0.6 vol ‰ of CO is present. The amount of NO adsorbed is about 1/60 as compared with that of NH3.
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