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Drift Study of the Oxidation and the Ammoxidation of Toluene over a TiO2(B)-Supported Vanadia Catalyst

Sanati, Mehri LU and Andersson, Arne LU (1993) In Journal of Molecular Catalysis 81(1). p.51-62
Abstract
A DRIFT study of the adsorption and the (amm) oxidation of toluene was carried out at 150–300°C on a TiO2(B)-supported vanadia catalyst with a loading corresponding to 1.9 Mg V2O5 per m2 of the support surface area. In the absence of NH3 and gaseous oxygen, the adsorption of toluene at 150°C produces benzyl and benzoate intermediates. After one hour at the same temperature, further conversion of benzyl species, probably benzyloxy, into benzoate species is observed. Upon introduction of NH3 into the reaction cell, some benzonitrile is formed together with intermediates which possibly are (C6H5)CH(NH2)O- and (C6H5)C(NH2)(O-)2 species. Subsequent heat treatment at 300°C causes an increase in the amounts of benzonitrile and CO2 formed and the... (More)
A DRIFT study of the adsorption and the (amm) oxidation of toluene was carried out at 150–300°C on a TiO2(B)-supported vanadia catalyst with a loading corresponding to 1.9 Mg V2O5 per m2 of the support surface area. In the absence of NH3 and gaseous oxygen, the adsorption of toluene at 150°C produces benzyl and benzoate intermediates. After one hour at the same temperature, further conversion of benzyl species, probably benzyloxy, into benzoate species is observed. Upon introduction of NH3 into the reaction cell, some benzonitrile is formed together with intermediates which possibly are (C6H5)CH(NH2)O- and (C6H5)C(NH2)(O-)2 species. Subsequent heat treatment at 300°C causes an increase in the amounts of benzonitrile and CO2 formed and the simultaneous disappearance of the precursor intermediates. On the basis of identified intermediates and observed transformations, a mechanism for the partial (amm)oxidation of toluene is proposed. The formation of CO2 is believed to pass over intermediates, which are identified as benzoquinone and butenolide species. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
vanadia catalyst, toluene, titania, supported catalyst, oxidation, DRIFT study, ammoxidation
in
Journal of Molecular Catalysis
volume
81
issue
1
pages
51 - 62
publisher
Elsevier
external identifiers
  • Scopus:0027576727
DOI
10.1016/0304-5102(93)80022-M
language
English
LU publication?
yes
id
93a98ac9-2f37-47d2-ba02-b32a5eabe9c0 (old id 2007270)
date added to LUP
2011-07-05 13:12:27
date last changed
2016-11-20 04:25:59
@misc{93a98ac9-2f37-47d2-ba02-b32a5eabe9c0,
  abstract     = {A DRIFT study of the adsorption and the (amm) oxidation of toluene was carried out at 150–300°C on a TiO2(B)-supported vanadia catalyst with a loading corresponding to 1.9 Mg V2O5 per m2 of the support surface area. In the absence of NH3 and gaseous oxygen, the adsorption of toluene at 150°C produces benzyl and benzoate intermediates. After one hour at the same temperature, further conversion of benzyl species, probably benzyloxy, into benzoate species is observed. Upon introduction of NH3 into the reaction cell, some benzonitrile is formed together with intermediates which possibly are (C6H5)CH(NH2)O- and (C6H5)C(NH2)(O-)2 species. Subsequent heat treatment at 300°C causes an increase in the amounts of benzonitrile and CO2 formed and the simultaneous disappearance of the precursor intermediates. On the basis of identified intermediates and observed transformations, a mechanism for the partial (amm)oxidation of toluene is proposed. The formation of CO2 is believed to pass over intermediates, which are identified as benzoquinone and butenolide species.},
  author       = {Sanati, Mehri and Andersson, Arne},
  keyword      = {vanadia catalyst,toluene,titania,supported catalyst,oxidation,DRIFT study,ammoxidation},
  language     = {eng},
  number       = {1},
  pages        = {51--62},
  publisher    = {ARRAY(0xb94b328)},
  series       = {Journal of Molecular Catalysis},
  title        = {Drift Study of the Oxidation and the Ammoxidation of Toluene over a TiO2(B)-Supported Vanadia Catalyst},
  url          = {http://dx.doi.org/10.1016/0304-5102(93)80022-M},
  volume       = {81},
  year         = {1993},
}