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Kinetic study of the selective catalytic reduction of nitric oxides with hydrocarbon in diesel exhausts

Westerberg, B; Andersson, B; Kunkel, C and Odenbrand, Ingemar LU (1998) In Studies in Surface Science and Catalysis 116. p.317-326
Abstract
The kinetics of the selective catalytic reduction of nitric oxides (NOx) on a proprietary high temperature catalyst with diesel as the reductant have been studied. The objective was to derive a kinetic model that can be used for real time simulation of the catalyst. In the extension, the real time simulation will be used when controlling the injection of reductant. This is a requirement for achieving a high efficiency and a low fuel penalty. The response time and the NOx conversion level upon transient diesel injection was found to be dependent on the temperature. At temperatures below 570 K very low or no NOx conversion was observed. Above 570 K a small conversion was observed. No direct response upon diesel injection could be... (More)
The kinetics of the selective catalytic reduction of nitric oxides (NOx) on a proprietary high temperature catalyst with diesel as the reductant have been studied. The objective was to derive a kinetic model that can be used for real time simulation of the catalyst. In the extension, the real time simulation will be used when controlling the injection of reductant. This is a requirement for achieving a high efficiency and a low fuel penalty. The response time and the NOx conversion level upon transient diesel injection was found to be dependent on the temperature. At temperatures below 570 K very low or no NOx conversion was observed. Above 570 K a small conversion was observed. No direct response upon diesel injection could be distinguished and the NOx conversion was independent on the hydrocarbon concentration. As the temperature was increased the response became apparent and then faster and the conversion level gradually became more dependent on the hydrocarbon concentration. Above 700 K the response was immediate (response time less than 15 s) and the conversion level was directly dependent on the hydrocarbon concentration. It was concluded that the NOx reduction proceeds via the formation of a hydrocarbon intermediate and the successive reaction between the hydrocarbon intermediate and NOx. When this reaction mechanism was modeled many features of the catalyst behaviour were reproduced. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Studies in Surface Science and Catalysis
volume
116
pages
317 - 326
publisher
Elsevier
external identifiers
  • wos:000074776800030
  • scopus:37849187109
ISSN
0167-2991
DOI
10.1016/S0167-2991(98)80888-4
language
English
LU publication?
yes
id
e6244019-d8e7-46c7-be08-20bd8a228a3b (old id 3916353)
date added to LUP
2013-07-02 14:16:02
date last changed
2017-01-01 06:51:41
@article{e6244019-d8e7-46c7-be08-20bd8a228a3b,
  abstract     = {The kinetics of the selective catalytic reduction of nitric oxides (NOx) on a proprietary high temperature catalyst with diesel as the reductant have been studied. The objective was to derive a kinetic model that can be used for real time simulation of the catalyst. In the extension, the real time simulation will be used when controlling the injection of reductant. This is a requirement for achieving a high efficiency and a low fuel penalty. The response time and the NOx conversion level upon transient diesel injection was found to be dependent on the temperature. At temperatures below 570 K very low or no NOx conversion was observed. Above 570 K a small conversion was observed. No direct response upon diesel injection could be distinguished and the NOx conversion was independent on the hydrocarbon concentration. As the temperature was increased the response became apparent and then faster and the conversion level gradually became more dependent on the hydrocarbon concentration. Above 700 K the response was immediate (response time less than 15 s) and the conversion level was directly dependent on the hydrocarbon concentration. It was concluded that the NOx reduction proceeds via the formation of a hydrocarbon intermediate and the successive reaction between the hydrocarbon intermediate and NOx. When this reaction mechanism was modeled many features of the catalyst behaviour were reproduced.},
  author       = {Westerberg, B and Andersson, B and Kunkel, C and Odenbrand, Ingemar},
  issn         = {0167-2991},
  language     = {eng},
  pages        = {317--326},
  publisher    = {Elsevier},
  series       = {Studies in Surface Science and Catalysis},
  title        = {Kinetic study of the selective catalytic reduction of nitric oxides with hydrocarbon in diesel exhausts},
  url          = {http://dx.doi.org/10.1016/S0167-2991(98)80888-4},
  volume       = {116},
  year         = {1998},
}