Abstract—Necessary aldehyde amount for enough NOx reduction performance with HC-SCR catalyst is studied by simulated gas tests, and feasible conditions of fuel thermal decomposition for enough aldehyde amount are obtained by chemical kinetics computations. Regarding the thermal decomposition computations, reaction processes of hexadecane (C
16H
34 ) in hot air are parametrically computed. The effective production of aldehydes is observed in the two-stage ignition processes occurring in 600 - 700K. Between the first and second ignitions in 0.5% C
16H
34 - air mixtures, a relatively stable conditions of high aldehydes concentration of 0.4 - 0.6% stay about 0.5 - 0.6 sec duration, which can be utilized for NOx reduction. Results show that a system, which produce aldehyde from diesel fuel by thermal decomposition, has good potential to achieve enough NOx reduction with HC-SCR catalyst in 3% fuel penalty considering the studied necessary aldehyde amount.
Index Terms—Chemical kinetics computation, aldehyde, hydrocarbon selective catalytic reduction, NOx.
S. Yahata and H. Okuda are with DENSO CORP., Kariya, Japan (e-mail: shigeto_yahata@denso.co.jp, hayato_o_okuda@denso.co.jp).
N. Yoshikawa is with Nagoya University, Nagoya, Japan (e-mail: yoshikawa@yoshilab.nuae.nagoya-u.ac.jp).
N. Kanno was with Nagoya University, Nagoya, Japan. He is now with Meijo University, Nagoya, Japan (e-mail: kanno@meijo-u.ac.jp).
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Cite: Shigeto Yahata, Hayato Okuda, Norihiko Yoshikawa, and Nozomu Kanno, "Chemical Kinetics Computations of Fuel Decomposition to Aldehydes for NOx Reduction in Engine Exhaust Gas," International Journal of Chemical Engineering and Applications vol. 7, no. 4, pp. 244-248, 2016.
