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Reducing NOx in diesel exhausts by SCR technique: Experiments and simulations

Andersson, SL; Gabrielsson, P and Odenbrand, Ingemar LU (1994) In AICHE Journal 40(11). p.1911-1919
Abstract
Results of experiments are compared to simulations of the performance of V2O5/gamma-alumina SCR catalyst used to remove nitrogen oxides from diesel exhausts. The kinetic model is based on Eley-Rideal kinetics. Temperature programmed desorption (TPD) of the ammonia is used to evaluate adsorption/desorption parameters. Stationary experiments on a 3.6-dm(3) engine with a 4.8-dm(3) honeycomb catalyst is used to evaluate kinetic rate parameters for the reduction of NO with NH3. The desorption activation energy, E(a,des), is best fitted as a function of surface coverage yielding E(a,des) = 240 * (1-0.44 * theta(NH3)(0.36)) kJ/mol. A dynamic test (FTP) with a 12-dm(3) engine and 24.8-dm(3) honeycomb catalyst is done with a stoichiometric... (More)
Results of experiments are compared to simulations of the performance of V2O5/gamma-alumina SCR catalyst used to remove nitrogen oxides from diesel exhausts. The kinetic model is based on Eley-Rideal kinetics. Temperature programmed desorption (TPD) of the ammonia is used to evaluate adsorption/desorption parameters. Stationary experiments on a 3.6-dm(3) engine with a 4.8-dm(3) honeycomb catalyst is used to evaluate kinetic rate parameters for the reduction of NO with NH3. The desorption activation energy, E(a,des), is best fitted as a function of surface coverage yielding E(a,des) = 240 * (1-0.44 * theta(NH3)(0.36)) kJ/mol. A dynamic test (FTP) with a 12-dm(3) engine and 24.8-dm(3) honeycomb catalyst is done with a stoichiometric injection of ammonia. The NOx conversion is 52%, but during the freeway traffic the conversion reached 72%. The prediction of NOx conversion is good, but there are some deviations for temperature and ammonia slip. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
AICHE Journal
volume
40
issue
11
pages
1911 - 1919
publisher
Wiley-Blackwell
external identifiers
  • wos:A1994PP89700014
  • scopus:0028539308
ISSN
1547-5905
DOI
10.1002/aic.690401115
language
English
LU publication?
yes
id
3579b42f-a27a-4e9f-a6ad-c85baf79b753 (old id 3916377)
date added to LUP
2013-07-02 14:05:02
date last changed
2017-08-06 03:31:10
@article{3579b42f-a27a-4e9f-a6ad-c85baf79b753,
  abstract     = {Results of experiments are compared to simulations of the performance of V2O5/gamma-alumina SCR catalyst used to remove nitrogen oxides from diesel exhausts. The kinetic model is based on Eley-Rideal kinetics. Temperature programmed desorption (TPD) of the ammonia is used to evaluate adsorption/desorption parameters. Stationary experiments on a 3.6-dm(3) engine with a 4.8-dm(3) honeycomb catalyst is used to evaluate kinetic rate parameters for the reduction of NO with NH3. The desorption activation energy, E(a,des), is best fitted as a function of surface coverage yielding E(a,des) = 240 * (1-0.44 * theta(NH3)(0.36)) kJ/mol. A dynamic test (FTP) with a 12-dm(3) engine and 24.8-dm(3) honeycomb catalyst is done with a stoichiometric injection of ammonia. The NOx conversion is 52%, but during the freeway traffic the conversion reached 72%. The prediction of NOx conversion is good, but there are some deviations for temperature and ammonia slip.},
  author       = {Andersson, SL and Gabrielsson, P and Odenbrand, Ingemar},
  issn         = {1547-5905},
  language     = {eng},
  number       = {11},
  pages        = {1911--1919},
  publisher    = {Wiley-Blackwell},
  series       = {AICHE Journal},
  title        = {Reducing NOx in diesel exhausts by SCR technique: Experiments and simulations},
  url          = {http://dx.doi.org/10.1002/aic.690401115},
  volume       = {40},
  year         = {1994},
}