A New Transient NOx Direct Catalytic Decomposition on a Rh-based Catalyst

Nakatsuji, Tadao; Ruotoistenmäki, Juhana; Matsubara, Manabu; Uekusa, Taiji; Tanaka, Yousuke

doi:10.4271/2003-01-3243

Cited by 1 publication

(1 citation statement)

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“…Catalytic technology of after-treatment systems consists mainly of NO x direct decomposition (NDD) (Tadao et al, 2003), lean NO x traps (LNTs) (Tabata et al, 1995;Gregory et al, 1999), and selective catalytic reduction (SCR) (Gieshoff et al, 2001). Compared with NDD and SCR, LNTs attract more interest because of their higher NO x conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Effect of rich air/fuel ratio and temperature on NO x desorption of lean NO x trap

Liu

Zhang

et al. 2013

J. Zhejiang Univ. Sci. A

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An experimental and model-based study of the effect of rich air/fuel ratios (AFRs) and temperature on the NO x slip of a lean NO x trap (LNT) was conducted in a lean-burn gasoline engine with an LNT after-treatment system. The emissions of the engine test bench and the inlet temperature of the LNT were used as the major inlet boundary conditions of the LNT. The engine periodically operated between a constant lean AFR of 23 with alterable rich AFRs of 10, 11, 12, 13, and 14. A decrease in the rich AFR of the engine strengthened the desorption atmosphere in the LNT, an effect closely related to the number of reductants, and further heightened the NO x desorption of the LNT, but with a penalty in fuel consumption. To eliminate that penalty, the inlet boundary conditions of the LNT were varied by adjusting the inlet temperature within a range between 200 °C and 400 °C. An increase in inlet temperature heightened the NO x desorption of the LNT, and a NO x breakthrough occurred after the inlet temperature exceeded 390 °C. To control NO x breakthrough, the inlet temperature can be adjusted to offset the strong desorption atmosphere in the LNT commonly created by a rich AFR.

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