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Catalytic behaviour of M1, M2, and M1/M2 physical mixtures of the Mo-V-Nb-Te-oxide system in propane and propene ammoxidation

Holmberg, Johan LU ; Grasselli, Robert K and Andersson, Arne LU (2004) In Applied Catalysis A: General 270(1-2). p.121-134
Abstract
Essentially pure orthorhombic M1 and pseudo-hexagonal M2 phases were prepared using the precursor method. Consistent with literature the M1 phase was shown to be effective for propane ammoxidation to acrylonitrile while the M2 phase was essentially inert for propane activation. Both phases convert propene efficiently to acrylonitrile. Both phases show a significant selectivity dependence on the ammonia and oxygen concentrations in the feed, revealing thereby additional insights into the reaction mechanism. Physical mixtures of the two separately prepared phases exhibited symbiosis in the ammoxidation of propane when finally divided (similar to5 mum), thoroughly mixed and brought into intimate contact with each other. Acrylonitrile yields... (More)
Essentially pure orthorhombic M1 and pseudo-hexagonal M2 phases were prepared using the precursor method. Consistent with literature the M1 phase was shown to be effective for propane ammoxidation to acrylonitrile while the M2 phase was essentially inert for propane activation. Both phases convert propene efficiently to acrylonitrile. Both phases show a significant selectivity dependence on the ammonia and oxygen concentrations in the feed, revealing thereby additional insights into the reaction mechanism. Physical mixtures of the two separately prepared phases exhibited symbiosis in the ammoxidation of propane when finally divided (similar to5 mum), thoroughly mixed and brought into intimate contact with each other. Acrylonitrile yields significantly higher than those obtained with the M1 phase alone were demonstrated with a 50 wt.% M1/50 wt.% M2 physical mixture having a corresponding Surface area ratio of about 4:1. The phase cooperation effect is particularly large at high propane conversions and non-existent when the particle size of the phases is too large (e.g. >250 mum) and the inter-particle contact is poor. Published by Elsevier B.V. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Catalysis A: General
volume
270
issue
1-2
pages
121 - 134
publisher
Elsevier
external identifiers
  • wos:000222892800012
  • scopus:3042687718
ISSN
0926-860X
DOI
10.1016/j.apcata.2004.04.029
language
English
LU publication?
yes
id
756048ec-269a-43e1-aa90-0db73762888b (old id 138809)
date added to LUP
2007-06-25 11:14:36
date last changed
2017-08-20 04:34:01
@article{756048ec-269a-43e1-aa90-0db73762888b,
  abstract     = {Essentially pure orthorhombic M1 and pseudo-hexagonal M2 phases were prepared using the precursor method. Consistent with literature the M1 phase was shown to be effective for propane ammoxidation to acrylonitrile while the M2 phase was essentially inert for propane activation. Both phases convert propene efficiently to acrylonitrile. Both phases show a significant selectivity dependence on the ammonia and oxygen concentrations in the feed, revealing thereby additional insights into the reaction mechanism. Physical mixtures of the two separately prepared phases exhibited symbiosis in the ammoxidation of propane when finally divided (similar to5 mum), thoroughly mixed and brought into intimate contact with each other. Acrylonitrile yields significantly higher than those obtained with the M1 phase alone were demonstrated with a 50 wt.% M1/50 wt.% M2 physical mixture having a corresponding Surface area ratio of about 4:1. The phase cooperation effect is particularly large at high propane conversions and non-existent when the particle size of the phases is too large (e.g. >250 mum) and the inter-particle contact is poor. Published by Elsevier B.V.},
  author       = {Holmberg, Johan and Grasselli, Robert K and Andersson, Arne},
  issn         = {0926-860X},
  language     = {eng},
  number       = {1-2},
  pages        = {121--134},
  publisher    = {Elsevier},
  series       = {Applied Catalysis A: General},
  title        = {Catalytic behaviour of M1, M2, and M1/M2 physical mixtures of the Mo-V-Nb-Te-oxide system in propane and propene ammoxidation},
  url          = {http://dx.doi.org/10.1016/j.apcata.2004.04.029},
  volume       = {270},
  year         = {2004},
}