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Catalytic Anisotropy of MoO3 in the Oxidative Ammonolysis of Toluene

Andersson, Arne LU and Hansen, Staffan LU (1988) In Journal of Catalysis 114(2). p.332-346
Abstract
The oxidative ammonolysis of toluene, i.e., ammoxidation without the presence of molecular oxygen, was studied over a series of samples of MoO3 crystals. The specific surface areas of the various faces were determined from SEM micrographs. Correlations between activities and surface planes were found. For the formation of nitrile the specific activity decreased in the order {001} and {h01} > {100} > {010}. Also, for the formation of carbon oxides the terminations in the [001] direction were found to be especially active. These results are discussed in relation to surface structures and bond strength values of various oxygen species. It is concluded that the presence of both oxygen vacancies and nucleophilic oxygen species is a... (More)
The oxidative ammonolysis of toluene, i.e., ammoxidation without the presence of molecular oxygen, was studied over a series of samples of MoO3 crystals. The specific surface areas of the various faces were determined from SEM micrographs. Correlations between activities and surface planes were found. For the formation of nitrile the specific activity decreased in the order {001} and {h01} > {100} > {010}. Also, for the formation of carbon oxides the terminations in the [001] direction were found to be especially active. These results are discussed in relation to surface structures and bond strength values of various oxygen species. It is concluded that the presence of both oxygen vacancies and nucleophilic oxygen species is a prerequisite for selective reaction to occur and that electrophilic oxygen species are the source for formation of carbon oxides. The characteristics of the various faces, as they emerge from the results on oxidative ammonolysis of toluene, seem to be of general significance for reactions occurring at the same types of active sites. They are shown to be applicable to results published in the literature on the oxidation of both propene and isobutene. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Catalysis
volume
114
issue
2
pages
332 - 346
publisher
Elsevier
external identifiers
  • wos:A1988R433500013
  • scopus:0011044976
ISSN
1090-2694
DOI
10.1016/0021-9517(88)90037-1
language
English
LU publication?
yes
id
bc2e1f4d-4f9a-4133-ac97-976d99bfedf6 (old id 3914635)
date added to LUP
2013-07-01 14:06:38
date last changed
2017-07-30 03:50:49
@article{bc2e1f4d-4f9a-4133-ac97-976d99bfedf6,
  abstract     = {The oxidative ammonolysis of toluene, i.e., ammoxidation without the presence of molecular oxygen, was studied over a series of samples of MoO3 crystals. The specific surface areas of the various faces were determined from SEM micrographs. Correlations between activities and surface planes were found. For the formation of nitrile the specific activity decreased in the order {001} and {h01} > {100} > {010}. Also, for the formation of carbon oxides the terminations in the [001] direction were found to be especially active. These results are discussed in relation to surface structures and bond strength values of various oxygen species. It is concluded that the presence of both oxygen vacancies and nucleophilic oxygen species is a prerequisite for selective reaction to occur and that electrophilic oxygen species are the source for formation of carbon oxides. The characteristics of the various faces, as they emerge from the results on oxidative ammonolysis of toluene, seem to be of general significance for reactions occurring at the same types of active sites. They are shown to be applicable to results published in the literature on the oxidation of both propene and isobutene.},
  author       = {Andersson, Arne and Hansen, Staffan},
  issn         = {1090-2694},
  language     = {eng},
  number       = {2},
  pages        = {332--346},
  publisher    = {Elsevier},
  series       = {Journal of Catalysis},
  title        = {Catalytic Anisotropy of MoO3 in the Oxidative Ammonolysis of Toluene},
  url          = {http://dx.doi.org/10.1016/0021-9517(88)90037-1},
  volume       = {114},
  year         = {1988},
}