Journal article
Ethanol-selective catalytic reduction of NO by Ag/Al2O3 catalysts: Activity and deactivation by alkali salts
Department of Chemistry, Technical University of Denmark1
Centre for Catalysis and Sustainable Chemistry, Department of Chemistry, Technical University of Denmark2
Technical University of Denmark3
Department of Chemical and Biochemical Engineering, Technical University of Denmark4
CHEC Research Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark5
Ag/Al2O3 catalysts with and without potassium doping were prepared by incipient wetness impregnation and characterized by N2 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 ◦C).
Addition of 500 ppm of H2 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.
Language: | English |
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Year: | 2012 |
Pages: | 323-329 |
ISSN: | 18733883 and 09263373 |
Types: | Journal article |
DOI: | 10.1016/j.apcatb.2012.08.035 |
ORCIDs: | Schill, Leonhard , Putluru, Siva Sankar Reddy , Fehrmann, Rasmus and Jensen, Anker Degn |