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Effect of Zn Substitutions in YBa2Cu3O6 + x Phases on Reactivity during the Ammoxidation of Toluene

Otamiri, JC; Andersson, Arne LU ; Andersson, SLT; Crow, JE and Ye, G (1991) In Journal of the Chemical Society, Faraday Transactions 87(8). p.1265-1271
Abstract
Zn substitution in Y-Ba-Cu-O phases influences the catalytic ammoxidation of toluene. The activity for formation of both benzonitrile and CO2 at low and high O2 pressures, respectively, decreases strongly with increasing Zn content up to 4%. Above this substitution level, the activity, however, increases slightly. Characterisations of the surface by XPS and of the bulk by XRD analysis, indicate the presence of overlayers on the catalysts. In these overlayers, irrespective of the Zn content of catalysts, Cu1 states predominate at low O2 pressure and Cu11 at high pressure. These states are associated with selective and non-selective properties, respectively. The activity of the catalysts shows a general tendency to increase with surface... (More)
Zn substitution in Y-Ba-Cu-O phases influences the catalytic ammoxidation of toluene. The activity for formation of both benzonitrile and CO2 at low and high O2 pressures, respectively, decreases strongly with increasing Zn content up to 4%. Above this substitution level, the activity, however, increases slightly. Characterisations of the surface by XPS and of the bulk by XRD analysis, indicate the presence of overlayers on the catalysts. In these overlayers, irrespective of the Zn content of catalysts, Cu1 states predominate at low O2 pressure and Cu11 at high pressure. These states are associated with selective and non-selective properties, respectively. The activity of the catalysts shows a general tendency to increase with surface copper concentrations as found from XPS studies. However, strong deviations from linearity indicate that the activity of the overlayer is greatly influenced by the bulk acting as a support. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of the Chemical Society, Faraday Transactions
volume
87
issue
8
pages
1265 - 1271
publisher
Royal Society of Chemistry
external identifiers
  • wos:A1991FJ44600035
  • scopus:30244546572
ISSN
0956-5000
DOI
10.1039/ft9918701265
language
English
LU publication?
yes
id
76c6706d-2afc-4ec5-9708-de318731d1b6 (old id 3915008)
date added to LUP
2013-07-01 14:46:08
date last changed
2017-07-30 04:35:36
@article{76c6706d-2afc-4ec5-9708-de318731d1b6,
  abstract     = {Zn substitution in Y-Ba-Cu-O phases influences the catalytic ammoxidation of toluene. The activity for formation of both benzonitrile and CO2 at low and high O2 pressures, respectively, decreases strongly with increasing Zn content up to 4%. Above this substitution level, the activity, however, increases slightly. Characterisations of the surface by XPS and of the bulk by XRD analysis, indicate the presence of overlayers on the catalysts. In these overlayers, irrespective of the Zn content of catalysts, Cu1 states predominate at low O2 pressure and Cu11 at high pressure. These states are associated with selective and non-selective properties, respectively. The activity of the catalysts shows a general tendency to increase with surface copper concentrations as found from XPS studies. However, strong deviations from linearity indicate that the activity of the overlayer is greatly influenced by the bulk acting as a support.},
  author       = {Otamiri, JC and Andersson, Arne and Andersson, SLT and Crow, JE and Ye, G},
  issn         = {0956-5000},
  language     = {eng},
  number       = {8},
  pages        = {1265--1271},
  publisher    = {Royal Society of Chemistry},
  series       = {Journal of the Chemical Society, Faraday Transactions},
  title        = {Effect of Zn Substitutions in YBa2Cu3O6 + x Phases on Reactivity during the Ammoxidation of Toluene},
  url          = {http://dx.doi.org/10.1039/ft9918701265},
  volume       = {87},
  year         = {1991},
}