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Analysis of the sta...
Analysis of the state and size of silver on alumina in effective removal of NOx from oxygen rich exhaust gas
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Arve, K (author)
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Klingstedt, F (author)
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Eranen, K (author)
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Murzin, DY (author)
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Capek, L (author)
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Dedecek, J (author)
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Sobalik, Z (author)
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Wichterlova, B (author)
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Svennerberg, K (author)
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- Wallenberg, Reine (author)
- Lund University,Lunds universitet,Centrum för analys och syntes,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Centre for Analysis and Synthesis,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Bovin, Jan-Olov (author)
- Lund University,Lunds universitet,Centrum för analys och syntes,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Centre for Analysis and Synthesis,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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(creator_code:org_t)
- American Scientific Publishers, 2006
- 2006
- English.
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In: Journal of Nanoscience and Nanotechnology. - : American Scientific Publishers. - 1533-4880 .- 0000-0000. ; 6:4, s. 1076-1083
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http://dx.doi.org/10...
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Abstract
Subject headings
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology -- Nano-technology (hsv//eng)
Keyword
- exhaust gas
- removal of NOx
- silver
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Arve, K
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Klingstedt, F
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Eranen, K
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Murzin, DY
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Capek, L
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Dedecek, J
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show more...
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Sobalik, Z
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Wichterlova, B
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Svennerberg, K
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Wallenberg, Rein ...
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Bovin, Jan-Olov
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show less...
- About the subject
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Nano technology
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and Nano technology
- Articles in the publication
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Journal of Nanos ...
- By the university
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Lund University