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High-Throughput Study of the Effects of Inorganic Additives and Poisons on NH₃-SCR Catalysts - Part I: V₂O₅-WO₃/TiO₂ Catalysts

Klimczak, Margarete and Kern, Paul and Heinzelmann, Tanja and Lucas, Martin and Claus, Peter (2010):
High-Throughput Study of the Effects of Inorganic Additives and Poisons on NH₃-SCR Catalysts - Part I: V₂O₅-WO₃/TiO₂ Catalysts.
In: Applied Catalysis B: Environmental, pp. 39-47, 95, (1-2), [Online-Edition: http://dx.doi.org/10.1016/j.apcatb.2009.12.007],
[Article]

Abstract

The influence of phosphorus, alkaline- and alkaline earth metals, chromium and copper on the catalytic activity and selectivity of a V₂O₅-WO₃/TiO₂ catalyst for the selective catalytic reduction (SCR) of nitrogen oxides with ammonia has been studied. These components are put through a catalytic aftertreatment system of a diesel engine as impurities of biodiesel (K, Na, P), urea solution (K, Na, Ca, Mg) and abrasion of the engine (Cr, Cu). The catalysts were exposed to corresponding nitrates or ammonium compounds in diluted solution by wet impregnation or deposition of inorganic aerosol particles. The second approach allows a more realistic investigation using catalysts and reaction conditions close to mobile application. Hereby, the effects of single catalyst poisons have been investigated. Furthermore, the influence of combinations of poisons using Design of Experiments (DOE) has been determined in case of impregnated catalysts. Physical and chemical characterization methods focusing on NH₃-TPD, penetration profiles and chemical analysis have been carried out to gain insight into the extent and the mechanism of deactivation. Both impregnated and aerosol deactivated catalysts show a strong poisoning effect of alkaline metals due to a reduced ammonia adsorption capacity. This effect could be weakened by a simultaneous doping of phosphates or sulphates. Chromium and copper are moderate catalyst poisons but have the ability to increase the N₂O production.

Item Type: Article
Erschienen: 2010
Creators: Klimczak, Margarete and Kern, Paul and Heinzelmann, Tanja and Lucas, Martin and Claus, Peter
Title: High-Throughput Study of the Effects of Inorganic Additives and Poisons on NH₃-SCR Catalysts - Part I: V₂O₅-WO₃/TiO₂ Catalysts
Language: English
Abstract:

The influence of phosphorus, alkaline- and alkaline earth metals, chromium and copper on the catalytic activity and selectivity of a V₂O₅-WO₃/TiO₂ catalyst for the selective catalytic reduction (SCR) of nitrogen oxides with ammonia has been studied. These components are put through a catalytic aftertreatment system of a diesel engine as impurities of biodiesel (K, Na, P), urea solution (K, Na, Ca, Mg) and abrasion of the engine (Cr, Cu). The catalysts were exposed to corresponding nitrates or ammonium compounds in diluted solution by wet impregnation or deposition of inorganic aerosol particles. The second approach allows a more realistic investigation using catalysts and reaction conditions close to mobile application. Hereby, the effects of single catalyst poisons have been investigated. Furthermore, the influence of combinations of poisons using Design of Experiments (DOE) has been determined in case of impregnated catalysts. Physical and chemical characterization methods focusing on NH₃-TPD, penetration profiles and chemical analysis have been carried out to gain insight into the extent and the mechanism of deactivation. Both impregnated and aerosol deactivated catalysts show a strong poisoning effect of alkaline metals due to a reduced ammonia adsorption capacity. This effect could be weakened by a simultaneous doping of phosphates or sulphates. Chromium and copper are moderate catalyst poisons but have the ability to increase the N₂O production.

Journal or Publication Title: Applied Catalysis B: Environmental
Volume: 95
Number: 1-2
Uncontrolled Keywords: V?O?-WO?/TiO?; catalyst deactivation; Selective Catalytic Reduction (SCR); deNOx activity; high-throughput experiments; Design of Experiments (DOE)
Divisions: 07 Department of Chemistry
07 Department of Chemistry > Fachgebiet Technische Chemie > Technische Chemie II
07 Department of Chemistry > Fachgebiet Technische Chemie
Date Deposited: 10 Dec 2009 14:00
Official URL: http://dx.doi.org/10.1016/j.apcatb.2009.12.007
Additional Information:

Available online 29. Dezember 2009

Identification Number: doi:10.1016/j.apcatb.2009.12.007
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