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

P. Konova*, K. Arve, F. Klingstedt, P. Nikolov, A. Naydenov, N. Kumar, D. Yu Murzin

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

24 Citations (Scopus)

Abstract

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 5 wt.% 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.

Original languageEnglish
Pages (from-to)138-145
Number of pages8
JournalApplied Catalysis B: Environmental
Volume70
Issue number1-4
DOIs
Publication statusPublished - 31 Jan 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • Ag/alumina
  • Ag/ZSM-5
  • Dual bed
  • HC-SCR
  • NO emissions

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