A combination of Ag/alumina and Ag modified ZSM-5 to remove NOx and CO during lean conditions

Single and bi-metallic silver modified ZSM-5 catalysts were synthesized using different methods of preparation, characterized by several techniques and tested in simulated diesel conditions. Additionally the catalytic behaviour of the most active catalyst, containing 5wt.% Ag and prepared by impregn...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2007-01, Vol.70 (1-4), p.138-145
Main Authors: Konova, P., Arve, K., Klingstedt, F., Nikolov, P., Naydenov, A., Kumar, N., Murzin, D. Yu
Format: Article
Language:English
Subjects:
Ag/alumina
Ag/ZSM-5
Dual bed
HC-SCR
NOx emissions
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Summary:Single and bi-metallic silver modified ZSM-5 catalysts were synthesized using different methods of preparation, characterized by several techniques and tested in simulated diesel conditions. Additionally the catalytic behaviour of the most active catalyst, containing 5wt.% Ag and prepared by impregnation (5Ag(Imp)-H-ZSM-5), was studied over a broad temperature range with two reducing agents (octane and propene). To correlate the catalytic activity of the prepared catalysts with preparation parameters the materials were characterized by XRD, SEM, N2-physisorption, octane/propene-TPD, EPR and ICP techniques. A dual bed system consisting of Ag/alumina and the most active zeolitic material (5Ag(Imp)-H-ZSM-5) was shown not only to substantially enhance the activity of Ag/alumina in the low temperature region, but also to completely oxidize the CO and unburned hydrocarbons.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2005.10.042