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

Arve, K; Klingstedt, F; Eranen, K; Murzin, DY; Capek, L; Dedecek, J; Sobalik, Z; Wichterlova, B; Svennerberg, K and Wallenberg, Reine LU , et al. (2006) In Journal of Nanoscience and Nanotechnology 6(4). p.1076-1083
Abstract
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... (More)
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. (Less)
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Contribution to journal
publication status
published
subject
keywords
exhaust gas, removal of NOx, silver
in
Journal of Nanoscience and Nanotechnology
volume
6
issue
4
pages
1076 - 1083
publisher
American Scientific Publishers
external identifiers
  • wos:000237069200025
  • pmid:16736769
  • scopus:33745626498
ISSN
1533-4880
DOI
10.1166/jnn.2006.153
language
English
LU publication?
yes
id
b02caeab-d464-44c8-a932-db05d0717ebe (old id 410703)
date added to LUP
2007-09-25 11:50:31
date last changed
2019-01-06 06:25:51
@article{b02caeab-d464-44c8-a932-db05d0717ebe,
  abstract     = {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 &lt; 2 wt% Ag and exhibiting high octane-SCR activity In highly loaded Ag/alumina samples or those reduced and reoxidized at high temperature (&gt; 400 degrees C), large metallic particles are stabilized, resulting in poor conversion of NOx to N-2.},
  author       = {Arve, K and Klingstedt, F and Eranen, K and Murzin, DY and Capek, L and Dedecek, J and Sobalik, Z and Wichterlova, B and Svennerberg, K and Wallenberg, Reine and Bovin, Jan-Olov},
  issn         = {1533-4880},
  keyword      = {exhaust gas,removal of NOx,silver},
  language     = {eng},
  number       = {4},
  pages        = {1076--1083},
  publisher    = {American Scientific Publishers},
  series       = {Journal of Nanoscience and Nanotechnology},
  title        = {Analysis of the state and size of silver on alumina in effective removal of NOx from oxygen rich exhaust gas},
  url          = {http://dx.doi.org/10.1166/jnn.2006.153},
  volume       = {6},
  year         = {2006},
}