Abstract
Abstract
A Nakatsuji-type rhodium-based catalytic NOx decomposition/reduction system, which efficiently removes NOx from automotive exhaust when operated under periodic lean/rich conditions, is investigated. The kinetic behaviour of this system is studied using the recently developed code DETCHEMTRANSIENT. This code treats the non-stationary processes in the chemically reactive flow, and couples detailed surface microkinetic simulations with computational fluid dynamics (CFD). A comparison of experimental and theoretical results, leads to the assumptions that there is significant influence from the short rich period on the NO conversion under the investigated transient conditions. It is discussed how the temperature and lean/rich period ratio affect the efficiency.