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Catalysis and structure of the SbVO4/Sb2O4 system for propane ammoxidation

Nilsson, J; Landa Canovas, A; Hansen, Staffan LU and Andersson, Arne LU (1997) In Catalysis Today 33(1-3). p.97-108
Abstract
Pure Sb0.9V0.9O4 and various preparations with excess of either vanadia or antimony oxide, including mechanical mixtures, have been investigated for propane ammoxidation to acrylonitrile. The catalysts were characterized before and after use in catalysis by various methods, including electron microscopy, infrared spectroscopy and XPS. The catalytic data show that preparations with approximate to SbVO4 and alpha-Sb2O4, compared with the single phases, are more selective to acrylonitrile formation on the condition that the excess antimony oxide is present while synthesising the approximate to SbVO, phase. Considering the catalytic data together with the results from the characterisations, various possibilities are discussed to explain the... (More)
Pure Sb0.9V0.9O4 and various preparations with excess of either vanadia or antimony oxide, including mechanical mixtures, have been investigated for propane ammoxidation to acrylonitrile. The catalysts were characterized before and after use in catalysis by various methods, including electron microscopy, infrared spectroscopy and XPS. The catalytic data show that preparations with approximate to SbVO4 and alpha-Sb2O4, compared with the single phases, are more selective to acrylonitrile formation on the condition that the excess antimony oxide is present while synthesising the approximate to SbVO, phase. Considering the catalytic data together with the results from the characterisations, various possibilities are discussed to explain the role of excess alpha-Sb2O4 in propane ammoxidation. Possibilities that can be excluded on rational grounds are catalysis on two phases, or, at grain boundaries, an influence on the morphology of approximate to SbVO4 from alpha-Sb2O4, the formation of alpha-Sb2O4 containing vanadium, defect formation, creation of active sites by the spillover of oxygen, and formation of VSb2O5. Instead, the observed synergy effect is due to the formation of approximate to SbVO4 enriched with antimony at the surface, creating isolation to a suitable level of the V-centres. The explanation is consistent with several observations including catalytic data for a series of vanadium compounds with different vanadium content, showing that structural isolation of the vanadium is necessary for obtaining high selectivity to acrylonitrile. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
structure, SbVO4/Sb2O4 system, propane ammoxidation
in
Catalysis Today
volume
33
issue
1-3
pages
97 - 108
publisher
Elsevier
external identifiers
  • wos:A1997WF26200010
  • scopus:0038967041
ISSN
0920-5861
DOI
10.1016/S0920-5861(96)00110-1
language
English
LU publication?
yes
id
cf22e409-6a34-4b4b-ba61-8b1498d91334 (old id 3915236)
date added to LUP
2013-07-01 15:21:11
date last changed
2017-08-27 05:09:45
@article{cf22e409-6a34-4b4b-ba61-8b1498d91334,
  abstract     = {Pure Sb0.9V0.9O4 and various preparations with excess of either vanadia or antimony oxide, including mechanical mixtures, have been investigated for propane ammoxidation to acrylonitrile. The catalysts were characterized before and after use in catalysis by various methods, including electron microscopy, infrared spectroscopy and XPS. The catalytic data show that preparations with approximate to SbVO4 and alpha-Sb2O4, compared with the single phases, are more selective to acrylonitrile formation on the condition that the excess antimony oxide is present while synthesising the approximate to SbVO, phase. Considering the catalytic data together with the results from the characterisations, various possibilities are discussed to explain the role of excess alpha-Sb2O4 in propane ammoxidation. Possibilities that can be excluded on rational grounds are catalysis on two phases, or, at grain boundaries, an influence on the morphology of approximate to SbVO4 from alpha-Sb2O4, the formation of alpha-Sb2O4 containing vanadium, defect formation, creation of active sites by the spillover of oxygen, and formation of VSb2O5. Instead, the observed synergy effect is due to the formation of approximate to SbVO4 enriched with antimony at the surface, creating isolation to a suitable level of the V-centres. The explanation is consistent with several observations including catalytic data for a series of vanadium compounds with different vanadium content, showing that structural isolation of the vanadium is necessary for obtaining high selectivity to acrylonitrile.},
  author       = {Nilsson, J and Landa Canovas, A and Hansen, Staffan and Andersson, Arne},
  issn         = {0920-5861},
  keyword      = {structure,SbVO4/Sb2O4 system,propane ammoxidation},
  language     = {eng},
  number       = {1-3},
  pages        = {97--108},
  publisher    = {Elsevier},
  series       = {Catalysis Today},
  title        = {Catalysis and structure of the SbVO4/Sb2O4 system for propane ammoxidation},
  url          = {http://dx.doi.org/10.1016/S0920-5861(96)00110-1},
  volume       = {33},
  year         = {1997},
}