NDLI: Study of Ammonia Formation During the Purge of a Lean NO$

Content Provider	Springer Nature Link
Author	Kouakou, A. Dhainaut, F. Granger, P. Fresnet, F. Louis Rose, I.
Copyright Year	2009
Abstract	The aim of this work was to study the formation of ammonia during the regeneration step of a commercial lean NO$_{ x }$Trap catalyst in real conditions. Experiments were carried out on an engine test bench equipped with 2.2 L common rail diesel engine. The after-treatment system was composed of a commercial NSR monolith catalyst with a volume of 2.2 L. This material was composed of platinum, palladium and rhodium, as active components, with barium oxide and alumina as storage component and support, respectively. Catalytic measurements were carried out at 280 °C. Particular attention has been paid to formation of ammonia during the purge using hydrogen and CO as reducing agents. The time dependency of the extent of ammonia formation and the influence of hydrogen concentration were carefully examined. It was observed that the temperature rose in the first step of the regeneration process, after the switch in rich conditions, due to the occurrence of exothermic oxidation (H$_{2}$/O$_{2}$, CO/O$_{2}$) accompanied with the releasing of available vacant noble metal sites which may provide a route for H$_{2}$ and NO dissociation and/or subsequent surface reactions leading to the ultimate formation of ammonia. It was found that ammonia formation strongly depends on the purge duration and on the concentration of the reducing agent available during the purge.
Starting Page	1734
Ending Page	1739
Page Count	6
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	52
Issue Number	13-20
e-ISSN	15729028
Language	English
Publisher	Springer US
Publisher Date	2009-09-10
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	NO$_{ x }$-trap reduction catalyst Noble metal Ammonia Characterization and Evaluation of Materials Industrial Chemistry/Chemical Engineering Pharmacy Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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