Development of Di-Air - A New Diesel deNOx System by Adsorbed Intermediate Reductants
Date Published: 2011-08-30
Paper Number:2011-01-2089
DOI: 10.4271/2011-01-2089
Citation:
Bisaiji, Y., Yoshida, K., Inoue, M., Umemoto, K. et al., "Development of Di-Air - A New Diesel deNOx System by Adsorbed Intermediate Reductants," SAE Int. J. Fuels Lubr. 5(1):380-388, 2012, doi:10.4271/2011-01-2089.
Author(s):
Yuki Bisaiji - Toyota Motor Corp.
Kohei Yoshida - Toyota Motor Corp.
Mikio Inoue - Toyota Motor Corp.
Kazuhiro Umemoto - Toyota Motor Corp.
Takao Fukuma - Toyota Motor Corp.
Abstract:
An unprecedented phenomenon that achieves high NOx conversion was found over an NSR catalyst. This phenomenon occurs when continuous short cycle injections of hydrocarbons (HCs) are supplied at a predetermined concentration in lean conditions. Furthermore, this phenomenon has a wider range of applicability for different catalyst temperatures (up to 800 degrees Celsius) and SVs, and for extending thermal and sulfur durability than a conventional NOx storage and reduction system. This paper analyzes the reaction mechanism and concludes it to be highly active HC-deNOx by intermediates generated from adsorbed NOx over the base catalysts and HCs partially oxidized by oscillated HC injection. Subsequently, a high performance deNOx system named Di-Air (diesel NOx aftertreatment by adsorbed intermediate reductants) was demonstrated that applies this concept to high speed driving cycles.
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