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Kinetics and mechanisms in the ammoxidation of toluene over a V2O5 catalyst. Part 1: Selective reactions

Otamiri, J and Andersson, Arne LU (1988) In Catalysis Today 3(2-3). p.211-222
Abstract
A thorough kinetic investigation of the ammoxidation of toluene over a V2O5 catalyst was carried out. Pressures of reactants were varied and rates for formation of benzonitrile and benzaldehyde were determined. Kinetic expressions completely describing experimental data were derived. A mechanisms is proposed on basis of both rate equations and other types of information published in the literature. The (010) plane of V2O5 is considered to be the active plane. An ensemble of 4 V=O species, having neighbouring vanadium ions exposed, is the active site. The rate-determining step for formation of aldehyde is the abstraction of a hydrogen atom from the methyl group. Nitrile is formed from two routes. In one of the routes, the active site reacts... (More)
A thorough kinetic investigation of the ammoxidation of toluene over a V2O5 catalyst was carried out. Pressures of reactants were varied and rates for formation of benzonitrile and benzaldehyde were determined. Kinetic expressions completely describing experimental data were derived. A mechanisms is proposed on basis of both rate equations and other types of information published in the literature. The (010) plane of V2O5 is considered to be the active plane. An ensemble of 4 V=O species, having neighbouring vanadium ions exposed, is the active site. The rate-determining step for formation of aldehyde is the abstraction of a hydrogen atom from the methyl group. Nitrile is formed from two routes. In one of the routes, the active site reacts with one ammonia molecule, which constitutes a rate-limiting step. In the second route, the active site chemisorbs two ammonia species, and the rate-determining step is the hydrogen abstraction from the methyl group. The results indicate that the electronic properties of the surface are greatly affected by adsorption of ammonia. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Catalysis Today
volume
3
issue
2-3
pages
211 - 222
publisher
Elsevier
external identifiers
  • scopus:0006141842
ISSN
0920-5861
DOI
10.1016/0920-5861(88)87010-X
language
English
LU publication?
yes
id
9e3f9dc0-df89-4b61-a778-d9501e0b4eda (old id 3917849)
date added to LUP
2013-07-04 13:55:03
date last changed
2017-08-27 05:21:49
@article{9e3f9dc0-df89-4b61-a778-d9501e0b4eda,
  abstract     = {A thorough kinetic investigation of the ammoxidation of toluene over a V2O5 catalyst was carried out. Pressures of reactants were varied and rates for formation of benzonitrile and benzaldehyde were determined. Kinetic expressions completely describing experimental data were derived. A mechanisms is proposed on basis of both rate equations and other types of information published in the literature. The (010) plane of V2O5 is considered to be the active plane. An ensemble of 4 V=O species, having neighbouring vanadium ions exposed, is the active site. The rate-determining step for formation of aldehyde is the abstraction of a hydrogen atom from the methyl group. Nitrile is formed from two routes. In one of the routes, the active site reacts with one ammonia molecule, which constitutes a rate-limiting step. In the second route, the active site chemisorbs two ammonia species, and the rate-determining step is the hydrogen abstraction from the methyl group. The results indicate that the electronic properties of the surface are greatly affected by adsorption of ammonia.},
  author       = {Otamiri, J and Andersson, Arne},
  issn         = {0920-5861},
  language     = {eng},
  number       = {2-3},
  pages        = {211--222},
  publisher    = {Elsevier},
  series       = {Catalysis Today},
  title        = {Kinetics and mechanisms in the ammoxidation of toluene over a V2O5 catalyst. Part 1: Selective reactions},
  url          = {http://dx.doi.org/10.1016/0920-5861(88)87010-X},
  volume       = {3},
  year         = {1988},
}