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The Al-Sb-V-oxide system for propane ammoxidation: A study of regions of phase formation and catalytic role of Al, Sb, and V

Nilsson, Jerker; Landa Canovas, AR; Hansen, Staffan LU and Andersson, Arne LU (1996) In Journal of Catalysis 160(2). p.244-260
Abstract
Syntheses in the Al-Sb-V-O system, which is a candidate catalyst system for propane ammoxidation to acrylonitrile, were characterised by X-ray powder diffraction, electron diffraction, energy dispersive X-ray microanalysis, high-resolution electron microscopy, infrared spectroscopy, and catalytic measurements. The objective was to study phase formation as well as to identify the phase, or phases, which are active and selective for propane ammoxidation and to conclude about the catalytic role of the various types of metal ion centres. Calcination in air at 680 degrees C of mixtures of Al(OH)(3), Sb2O3, and V2O5 showed the formation of alpha-Sb2O4, V2O5, AlVO4, and two rutile-related phases Sb0.9V0.9O4 and Al1-xSbVxO4, 0 < x < 0.5. The... (More)
Syntheses in the Al-Sb-V-O system, which is a candidate catalyst system for propane ammoxidation to acrylonitrile, were characterised by X-ray powder diffraction, electron diffraction, energy dispersive X-ray microanalysis, high-resolution electron microscopy, infrared spectroscopy, and catalytic measurements. The objective was to study phase formation as well as to identify the phase, or phases, which are active and selective for propane ammoxidation and to conclude about the catalytic role of the various types of metal ion centres. Calcination in air at 680 degrees C of mixtures of Al(OH)(3), Sb2O3, and V2O5 showed the formation of alpha-Sb2O4, V2O5, AlVO4, and two rutile-related phases Sb0.9V0.9O4 and Al1-xSbVxO4, 0 < x < 0.5. The latter presents a trirutile-type superlattice as shown by electron diffraction and high-resolution transmission electron microscopy. Formation of Al1-xSbVxO4 was not observed starting from the phase composition, but required an excess of alumina (> 60 at.% Al). Without alumina in excess, Sb0.9V0.9O4 is formed. Activity measurements over phases belonging to the Al-Sb-V-O system revealed that Al1-xSbVxO4 is the most selective toward acrylonitrile formation, and it was identified as the active phase in a sample of patent type with Al : Sb : V = 21 : 5 : 1. Rationalisation of activity and selectivity data for V2O5, Sb2O4, Al2O3, Sb0.9V0.9O4, AlVO4, AlSbO4, Sb0.9V0.9O4/alpha-Sb2O4, beta-Sb1.9V0.1O4, and Al1-xSbVxO4 showed that in oxides with vanadium, it is the V-centres which are active and determine the specific activity. To have a catalyst that is selective to acrylonitrile and to avoid combustion, it is necessary to have structurally isolated V-centres which are surrounded by Al and/or Sb. (C) 1996 Academic Press, Inc. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Catalysis
volume
160
issue
2
pages
244 - 260
publisher
Elsevier
external identifiers
  • wos:A1996UT26400012
  • scopus:0000815455
ISSN
1090-2694
DOI
10.1006/jcat.1996.0143
language
English
LU publication?
yes
id
0d3c8fac-eca9-4fae-9bce-1288c60e1e71 (old id 3917815)
date added to LUP
2013-07-04 13:01:22
date last changed
2017-01-01 04:25:11
@article{0d3c8fac-eca9-4fae-9bce-1288c60e1e71,
  abstract     = {Syntheses in the Al-Sb-V-O system, which is a candidate catalyst system for propane ammoxidation to acrylonitrile, were characterised by X-ray powder diffraction, electron diffraction, energy dispersive X-ray microanalysis, high-resolution electron microscopy, infrared spectroscopy, and catalytic measurements. The objective was to study phase formation as well as to identify the phase, or phases, which are active and selective for propane ammoxidation and to conclude about the catalytic role of the various types of metal ion centres. Calcination in air at 680 degrees C of mixtures of Al(OH)(3), Sb2O3, and V2O5 showed the formation of alpha-Sb2O4, V2O5, AlVO4, and two rutile-related phases Sb0.9V0.9O4 and Al1-xSbVxO4, 0 &lt; x &lt; 0.5. The latter presents a trirutile-type superlattice as shown by electron diffraction and high-resolution transmission electron microscopy. Formation of Al1-xSbVxO4 was not observed starting from the phase composition, but required an excess of alumina (&gt; 60 at.% Al). Without alumina in excess, Sb0.9V0.9O4 is formed. Activity measurements over phases belonging to the Al-Sb-V-O system revealed that Al1-xSbVxO4 is the most selective toward acrylonitrile formation, and it was identified as the active phase in a sample of patent type with Al : Sb : V = 21 : 5 : 1. Rationalisation of activity and selectivity data for V2O5, Sb2O4, Al2O3, Sb0.9V0.9O4, AlVO4, AlSbO4, Sb0.9V0.9O4/alpha-Sb2O4, beta-Sb1.9V0.1O4, and Al1-xSbVxO4 showed that in oxides with vanadium, it is the V-centres which are active and determine the specific activity. To have a catalyst that is selective to acrylonitrile and to avoid combustion, it is necessary to have structurally isolated V-centres which are surrounded by Al and/or Sb. (C) 1996 Academic Press, Inc.},
  author       = {Nilsson, Jerker and Landa Canovas, AR and Hansen, Staffan and Andersson, Arne},
  issn         = {1090-2694},
  language     = {eng},
  number       = {2},
  pages        = {244--260},
  publisher    = {Elsevier},
  series       = {Journal of Catalysis},
  title        = {The Al-Sb-V-oxide system for propane ammoxidation: A study of regions of phase formation and catalytic role of Al, Sb, and V},
  url          = {http://dx.doi.org/10.1006/jcat.1996.0143},
  volume       = {160},
  year         = {1996},
}