This content is not included in your SAE MOBILUS subscription, or you are not logged in.
The Study of Urea Decomposition Process for NOx Reduction Activity on Urea-SCR Catalysts
Published October 03, 2012 by Society of Automotive Engineers of Japan in Japan
The effect of reducing agents for NO reduction activities were compared between NH₃ and urea on zeolite-type SCR catalysts such as Fe-, Cu- and Ce-zeolite type catalysts using the model-gas reactor. As a result, NO reduction performances had a similar tendency between both reducing agents. To investigate urea decomposition behavior, the FTIR analysis was operated on the surface of the Fe-zeolite catalyst during NO reduction. Then NH₃ was produced at a low enough temperature (130-160°) on the catalyst surface. Therefore, it is considered that the reducing agent species (NH₃ or urea) showed almost no difference for the NO reduction activity.