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In this study, general characteristics of DeNO<SUB>x</SUB> over Ag/Al₂O₃ were investigated in terms of the effects of reductants, oxygen, NO₂, water, and hydrogen. For the tested reducing agents, the best DeNO<SUB>x</SUB> performance over Ag/Al₂O₃ was achieved with alcohols which followed by olefinic or mid-range liquid hydrocarbons. Oxygen and NO₂ concentration also affected NO<SUB>x</SUB> conversion efficiencies to some extent. By increasing O₂ concentration from 5% to 15%, NO<SUB>x</SUB> conversions in the temperature range between 350℃ and 450℃ were increased more than 10% for C₃H?-SCR reaction. In the presence of hydrogen. oxidation of hydrocarbons and NO to NO₂ conversion were highly promoted at low temperature region between 200℃ and 400℃ over C₃H?-SCR. And this resulted in improved NO<SUB>x</SUB> reductions for the same temperature range. To evaluate the DeNO<SUB>x</SUB> enhancement effects by hydrogen, catalytic partial oxidation reforming reaction was also tested and some of its reforming products were introduced into the SCR reactants, where n-dodecane was used as a feedstock of the reforming. As the case of H₂ addition, catalytic partial oxidation products dramatically promoted C₃H?-SCR over Ag/Al₂O₃ especially in the low temperature range below 400℃. Compared to the results of hydrogen model gas tests, such promotion effect by CPOx products addition can be attributed to hydrogen enrichment in the SCR reactants. By the addition of CPOx products, inhibition effect by water was also reduced. C₃H?-SCR is seriously deactivated in the presence or water vapor because of water adsorption on the active sites instead of propylene. However, through the addition of CPOx products to the C₃H?-SCR reactants, NO<SUB>x</SUB> reduction was increased from around 0% to 20~25% at 300℃~400℃.

목차

Abstract
1. INTRODUCTION
2. EXPERIMENT
3. RESULTS
4. CONCLUSION
References

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UCI(KEPA) : I410-ECN-0101-2009-556-015704318