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CaSO4 deactivated V2O5-WO3/TiO2 SCR catalyst for a diesel power plant. Characterization and simulation of the kinetics of the SCR reactions

Odenbrand, C. U.Ingemar LU (2018) In Applied Catalysis B: Environmental 234. p.365-377
Abstract

The deactivation of a diesel SCR (Selective Catalytic Reduction) catalyst by impregnation with CaSO4 was studied. The loss in activity after 2729 h of use on the engine was lower than when deactivated by impregnation. This was the case even if the amount of Ca in the catalyst was high after use on the engine. In the used catalyst a surface layer of CaSO4 was built up on the monolith during use. This causes lower deactivation than when CaSO4 was introduced in the pore system of the catalyst. The kinetics of the SCR reaction, the oxidation of NH3 to N2 and two side reactions leading to N2O was used in the simulation. A coverage dependent heat of adsorption of NH3... (More)

The deactivation of a diesel SCR (Selective Catalytic Reduction) catalyst by impregnation with CaSO4 was studied. The loss in activity after 2729 h of use on the engine was lower than when deactivated by impregnation. This was the case even if the amount of Ca in the catalyst was high after use on the engine. In the used catalyst a surface layer of CaSO4 was built up on the monolith during use. This causes lower deactivation than when CaSO4 was introduced in the pore system of the catalyst. The kinetics of the SCR reaction, the oxidation of NH3 to N2 and two side reactions leading to N2O was used in the simulation. A coverage dependent heat of adsorption of NH3 was used. The heat decreased with the coverage and with the introduction of CaSO4 into the pores. After fitting the amounts of NO and N2O at the exit of the reactor against the temperature at the exit of the bed excellent agreements were obtained for the products N2 and H2O as well for the reactant NH3. This is the first time that the effect of CaSO4 poisoning of SCR catalysts and its effect on the kinetics is published.

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organization
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Contribution to journal
publication status
published
subject
keywords
Ca deactivation, Formation of NO, Poisoning and kinetics, Vanadia SCR diesel catalyst
in
Applied Catalysis B: Environmental
volume
234
pages
13 pages
publisher
Elsevier
external identifiers
  • scopus:85046697943
ISSN
0926-3373
DOI
language
English
LU publication?
yes
id
bb49f998-fdea-4e90-9e35-b554fc671544
date added to LUP
2018-05-21 08:57:38
date last changed
2018-05-29 12:31:49
@article{bb49f998-fdea-4e90-9e35-b554fc671544,
  abstract     = {<p>The deactivation of a diesel SCR (Selective Catalytic Reduction) catalyst by impregnation with CaSO<sub>4</sub> was studied. The loss in activity after 2729 h of use on the engine was lower than when deactivated by impregnation. This was the case even if the amount of Ca in the catalyst was high after use on the engine. In the used catalyst a surface layer of CaSO<sub>4</sub> was built up on the monolith during use. This causes lower deactivation than when CaSO<sub>4</sub> was introduced in the pore system of the catalyst. The kinetics of the SCR reaction, the oxidation of NH<sub>3</sub> to N<sub>2</sub> and two side reactions leading to N<sub>2</sub>O was used in the simulation. A coverage dependent heat of adsorption of NH<sub>3</sub> was used. The heat decreased with the coverage and with the introduction of CaSO<sub>4</sub> into the pores. After fitting the amounts of NO and N<sub>2</sub>O at the exit of the reactor against the temperature at the exit of the bed excellent agreements were obtained for the products N<sub>2</sub> and H<sub>2</sub>O as well for the reactant NH<sub>3</sub>. This is the first time that the effect of CaSO<sub>4</sub> poisoning of SCR catalysts and its effect on the kinetics is published.</p>},
  author       = {Odenbrand, C. U.Ingemar},
  issn         = {0926-3373},
  keyword      = {Ca deactivation,Formation of NO,Poisoning and kinetics,Vanadia SCR diesel catalyst},
  language     = {eng},
  month        = {10},
  pages        = {365--377},
  publisher    = {Elsevier},
  series       = {Applied Catalysis B: Environmental},
  title        = {CaSO<sub>4</sub> deactivated V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> SCR catalyst for a diesel power plant. Characterization and simulation of the kinetics of the SCR reactions},
  url          = {http://dx.doi.org/},
  volume       = {234},
  year         = {2018},
}