期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 127, 期 -, 页码 323-329出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2012.08.035
关键词
SCR of NO with ethanol; Ag/Al2O3; Potassium poisoning
资金
- Energinet.dk through the PSO [10521]
Ag/Al2O3 catalysts with and without potassium doping were prepared by incipient wetness impregnation and characterized by N-2 physisorption, XRPD. NH3-TPD and SEM. The influence of the Ag content from 1 to 5 wt.% was investigated for the selective catalytic reduction (SCR) of NO with ethanol. The 3 wt.% Ag/Al2O3 catalyst was found to be the most active and CO2 selective over a wide temperature window (300-500 degrees C). Addition of 500 ppm of H-2 has a mild promotional effect on the activity while SO2 has a strong negative influence on the SCR activity. Furthermore. the Ag/Al2O3 ethanol-SCR catalyst deactivated significantly by the addition of potassium although it was more resistant than the conventional V2O5 based NH3-SCR catalyst, which deactivated more at lower potassium loading. The higher potassium resistivity of the Ag/Al2O3 catalysts seems to be due to differences in reaction mechanism of Ag/Al2O3 ethanol-SCR catalyst compared to the conventional NH3-SCR catalyst. The still low potassium resistance, in combination with the high sensitivity to SO2, seems not to make these catalysts a real option for biomass fired boilers. (C) 2012 Elsevier B.V. All rights reserved.
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