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The importance of site isolation and phase cooperation in propane ammoxidation on rutile-type vanadia catalysts

Andersson, Arne LU ; Hansen, Staffan LU and Wickman, A (2001) In Topics in Catalysis 15(2-4). p.103-110
Abstract
Propane ammoxidation to acrylonitrile over rutile-type vanadia catalysts is discussed regarding phase cooperation and site isolation effects. Compared with the pure phases, biphasic catalysts with both similar to SbVO4 and alpha -Sb2O4 are considerably more selective to the formation of acrylonitrile. It is demonstrated that cooperation between the phases during the calcination of the catalyst and the use in propane ammoxidation results in spreading of antimony species from free antimony oxide to the surface of similar to SbVO4, forming Sb5+-V3+/V4+ supra-surface sites being involved in the formation of acrylonitrile. Dilution and isolation of the vanadium centers in similar to SbVO4 through the partial replacement with, e.g., Al, Ti and W... (More)
Propane ammoxidation to acrylonitrile over rutile-type vanadia catalysts is discussed regarding phase cooperation and site isolation effects. Compared with the pure phases, biphasic catalysts with both similar to SbVO4 and alpha -Sb2O4 are considerably more selective to the formation of acrylonitrile. It is demonstrated that cooperation between the phases during the calcination of the catalyst and the use in propane ammoxidation results in spreading of antimony species from free antimony oxide to the surface of similar to SbVO4, forming Sb5+-V3+/V4+ supra-surface sites being involved in the formation of acrylonitrile. Dilution and isolation of the vanadium centers in similar to SbVO4 through the partial replacement with, e.g., Al, Ti and W improves the catalytic properties. Structure-reactivity correlations using data for a nominal Sb0.9V0.9,TixOy series indicate that the activation of propane occurs on a V3+ site and the activation of ammonia requires an Sb5+ site. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
propane ammoxidation, Sb-V oxide catalysts, microstructure, phase, cooperation, site isolation
in
Topics in Catalysis
volume
15
issue
2-4
pages
103 - 110
publisher
Kluwer
external identifiers
  • wos:000170078900004
  • scopus:0035598448
ISSN
1572-9028
DOI
10.1023/A:1016653800022
language
English
LU publication?
yes
id
9987704d-a16b-4de5-a7e4-6066ad462205 (old id 3917030)
date added to LUP
2013-07-03 10:07:40
date last changed
2018-01-07 09:38:12
@article{9987704d-a16b-4de5-a7e4-6066ad462205,
  abstract     = {Propane ammoxidation to acrylonitrile over rutile-type vanadia catalysts is discussed regarding phase cooperation and site isolation effects. Compared with the pure phases, biphasic catalysts with both similar to SbVO4 and alpha -Sb2O4 are considerably more selective to the formation of acrylonitrile. It is demonstrated that cooperation between the phases during the calcination of the catalyst and the use in propane ammoxidation results in spreading of antimony species from free antimony oxide to the surface of similar to SbVO4, forming Sb5+-V3+/V4+ supra-surface sites being involved in the formation of acrylonitrile. Dilution and isolation of the vanadium centers in similar to SbVO4 through the partial replacement with, e.g., Al, Ti and W improves the catalytic properties. Structure-reactivity correlations using data for a nominal Sb0.9V0.9,TixOy series indicate that the activation of propane occurs on a V3+ site and the activation of ammonia requires an Sb5+ site.},
  author       = {Andersson, Arne and Hansen, Staffan and Wickman, A},
  issn         = {1572-9028},
  keyword      = {propane ammoxidation,Sb-V oxide catalysts,microstructure,phase,cooperation,site isolation},
  language     = {eng},
  number       = {2-4},
  pages        = {103--110},
  publisher    = {Kluwer},
  series       = {Topics in Catalysis},
  title        = {The importance of site isolation and phase cooperation in propane ammoxidation on rutile-type vanadia catalysts},
  url          = {http://dx.doi.org/10.1023/A:1016653800022},
  volume       = {15},
  year         = {2001},
}