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Transient modelling of a HC-SCR catalyst for diesel exhaust aftertreatment

Westerberg, B; Kunkel, C and Odenbrand, Ingemar LU (2003) In Chemical Engineering Journal 92(1-3). p.27-39
Abstract
The kinetics of a catalyst for hydrocarbon-selective catalytic reduction (HC-SCR) exhaust aftertreatment has been examined by means of transient experiments on a heavy-duty diesel engine rig. The influences of temperature, NO2 concentration, and the transient injection of hydrocarbon on the conversion of NO,, CO, and hydrocarbon were studied in a systematic manner. Hydrocarbon conversion was high and NO, conversion was related to the amount of injected hydrocarbon at high temperatures. At lower temperatures hydrocarbon conversion was low and NOx conversion was not directly related to hydrocarbon injection rate. Increased exhaust NO2/NO ratio resulted in NOx conversion at lower temperatures and also in accumulation of NO., on the catalyst... (More)
The kinetics of a catalyst for hydrocarbon-selective catalytic reduction (HC-SCR) exhaust aftertreatment has been examined by means of transient experiments on a heavy-duty diesel engine rig. The influences of temperature, NO2 concentration, and the transient injection of hydrocarbon on the conversion of NO,, CO, and hydrocarbon were studied in a systematic manner. Hydrocarbon conversion was high and NO, conversion was related to the amount of injected hydrocarbon at high temperatures. At lower temperatures hydrocarbon conversion was low and NOx conversion was not directly related to hydrocarbon injection rate. Increased exhaust NO2/NO ratio resulted in NOx conversion at lower temperatures and also in accumulation of NO., on the catalyst surface. The findings are in agreement with results from recent studies of the selective catalytic reduction of NO by propene. A catalyst model was designed in accordance to these studies and fitted to results from tailored and standard European transient cycles (ETC). The model shows reasonable agreement with experimental CO, NO, and NO2) data. Experimental hydrocarbon data are not as well reproduced, presumably due to the model approximation of hydrocarbons to one species. The full catalyst model used in the study is presented, including reaction kinetics and equations for mass and heat transfer. Mechanistic aspects are discussed and related to other studies. (C) 2002 Elsevier Science B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
kinetics, NOx, aftertreatment, transient modelling, diesel exhaust, reduction
in
Chemical Engineering Journal
volume
92
issue
1-3
pages
27 - 39
publisher
Elsevier
external identifiers
  • wos:000181476600004
  • scopus:0037445567
ISSN
1385-8947
DOI
10.1016/S1385-8947(02)00118-3
language
English
LU publication?
yes
id
80493603-2fe3-4d0e-af4c-31c0b284eeea (old id 317032)
date added to LUP
2007-09-24 08:07:03
date last changed
2018-06-24 04:40:13
@article{80493603-2fe3-4d0e-af4c-31c0b284eeea,
  abstract     = {The kinetics of a catalyst for hydrocarbon-selective catalytic reduction (HC-SCR) exhaust aftertreatment has been examined by means of transient experiments on a heavy-duty diesel engine rig. The influences of temperature, NO2 concentration, and the transient injection of hydrocarbon on the conversion of NO,, CO, and hydrocarbon were studied in a systematic manner. Hydrocarbon conversion was high and NO, conversion was related to the amount of injected hydrocarbon at high temperatures. At lower temperatures hydrocarbon conversion was low and NOx conversion was not directly related to hydrocarbon injection rate. Increased exhaust NO2/NO ratio resulted in NOx conversion at lower temperatures and also in accumulation of NO., on the catalyst surface. The findings are in agreement with results from recent studies of the selective catalytic reduction of NO by propene. A catalyst model was designed in accordance to these studies and fitted to results from tailored and standard European transient cycles (ETC). The model shows reasonable agreement with experimental CO, NO, and NO2) data. Experimental hydrocarbon data are not as well reproduced, presumably due to the model approximation of hydrocarbons to one species. The full catalyst model used in the study is presented, including reaction kinetics and equations for mass and heat transfer. Mechanistic aspects are discussed and related to other studies. (C) 2002 Elsevier Science B.V. All rights reserved.},
  author       = {Westerberg, B and Kunkel, C and Odenbrand, Ingemar},
  issn         = {1385-8947},
  keyword      = {kinetics,NOx,aftertreatment,transient modelling,diesel exhaust,reduction},
  language     = {eng},
  number       = {1-3},
  pages        = {27--39},
  publisher    = {Elsevier},
  series       = {Chemical Engineering Journal},
  title        = {Transient modelling of a HC-SCR catalyst for diesel exhaust aftertreatment},
  url          = {http://dx.doi.org/10.1016/S1385-8947(02)00118-3},
  volume       = {92},
  year         = {2003},
}