Abstract
This paper aims to find the optimal volumes of the LNT (Lean NOx Trap) and SCR (Selective Catalytic Reduction) catalysts for higher de-NOx performance and suppression of N 2O and NH 3 in a combined system of LNT + SCR. The basic characteristics of the LNT catalyst were identified first at various space velocities (SV), and then the effects of the variation in volume of the combined system were investigated. The NOx conversion, NH 3 production, and N 2O emissions were evaluated of four differently sized LNT–SCR systems. Considering all together the NOx conversion, cost of the precious metal, NH 3 slippage, and N 2O generation, the optimal volume ratio of LNT and SCR catalysts was found to be 1:1 for the LNT–SCR system.
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