Deposition and decomposition of urea and its by-products on TiO_2 and VWT-SCR catalysts

Kuntz C.; Weickenmeier H.; Boernhorst M.Deutschmann O.

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Deposition and decomposition of urea and its by-products on TiO_2 and VWT-SCR catalysts

机译：Deposition and decomposition of urea and its by-products on TiO_2 and VWT-SCR catalysts

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Exhaust gas aftertreatment devices such as selective catalytic reduction (SCR) catalysts are often positioned close to the combustion engine today. These close-coupled systems lead to rather short mixing sections of the reducing agent urea-water solution (UWS) and the exhaust gas in the case of SCR of nitrogen oxides (NOx) by ammonia. Due to higher temperatures, an increased UWS droplet evaporation is expected. However, startup procedures and unfavorable operating conditions can lead to a stronger impact onto exhaust pipes and the catalysts itself. The interaction of urea and its by-products with TiO2 and V2O5-WO3/TiO2 (VWT), as typical SCR catalyst materials, is investigated via thermogravimetric analysis. A surface reaction mechanism with associated kinetic expressions is developed. Complete decomposition of all deposited species occurs at temperatures as low as 450 degrees C. This behavior can be well represented by the model developed.

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《International journal of heat and fluid flow》 |2022年第6期|108969.1-108969.11|共11页
作者
Kuntz C.; Weickenmeier H.; Boernhorst M.Deutschmann O.;
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作者单位

Karlsruhe Inst Technol KIT, Inst Chem Technol & Polymer Chem, Kaiserstr 12, D-76128 Karlsruhe, Germany;

Karlsruhe Inst Technol KIT, Inst Chem Technol & Polymer Chem, Kaiserstr 12, D-76128 Karlsruhe, Germany|Karlsruhe Inst Technol KIT, Inst Catalysis Res & Technol, Kaiserstr 12, D-76128 Karlsruhe, Germany;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类
关键词
Selective catalytic reduction; Urea by-product decomposition; Catalyst influence; Model; Surface mechanism and kinetics;

Deposition and decomposition of urea and its by-products on TiO_2 and VWT-SCR catalysts

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