Methanol Assisted Lean NOx Reduction Over Ag–Al2O3—Influence of Hydrogen and Silver Loading
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The influence of hydrogen and silver loading on lean NOx reduction with methanol over Ag–Al2O3 are investigated by flow-reactor experiments, H2-TPR, TEM and XPS. Reduction of silver at low temperatures over Ag–Al2O3 with high silver loading, suggests involvement of silver species/particles that are large (which is supported by the TEM analysis) and/or loosely bound to the support. The silver species reduced by hydrogen cannot be directly associated with the activity for NOx reduction under methanol-SCR conditions. Furthermore, the activity for NOx reduction increases slightly at low temperatures when hydrogen is added to the feed. However, also without co-fed hydrogen, a high low-temperature activity is achieved for methanol assisted lean NOx reduction over Ag–Al2O3.
KeywordsMethanol Hydrogen Lean NOx reduction Ag/Al2O3 Silver
This work has been funded by the Swedish Energy Agency and performed within the Competence Centre for Catalysis, which is hosted by Chalmers University of Technology and financially supported by the Swedish Energy Agency and the member companies: AB Volvo, ECAPS AB, Haldor Topsøe A/S, Scania CV AB, Volvo Car Corporation AB and Wärtsilä Finland Oy. Financial support from Knut and Alice Wallenberg Foundation, Dnr KAW 2005.0055, is acknowledged.
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