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Analysis of the state and size of silver on alumina in effective removal of NOx from oxygen rich exhaust gas

In English

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Summary, in English

Ag/alumina catalysts with different silver contents for octane-SCR were prepared by impregnation and incipient wetness methods. Activity tests revealed that the decisive factor for high activity is not only a high dispersion of silver, but also the ability of the system to redisperse clustered silver. Determination of dispersion by TEM/HAADF and O-2-chemisorption experiments resulted in values close to each other even if the results were not directly comparable. This is suggested to be due to not complete silver reduction below 700 degrees C and the samples being very heterogeneous in terms of particle size, e.g., having a bimodal size distribution. Small charged Ag-n(delta+) clusters containing 2-8 silver atoms highly prevailed in the samples containing < 2 wt% Ag and exhibiting high octane-SCR activity In highly loaded Ag/alumina samples or those reduced and reoxidized at high temperature (> 400 degrees C), large metallic particles are stabilized, resulting in poor conversion of NOx to N-2.

Publiceringsår

2006

Språk

Engelska

Sidor

1076-1083

Publikation/Tidskrift/Serie

Journal of Nanoscience and Nanotechnology

Volym

6

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

American Scientific Publishers

Ämne

  • Nano Technology

Nyckelord

  • exhaust gas
  • removal of NOx
  • silver

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1533-4880