%0 Generic
%A Su, Qingyun
%D 2009
%F heidok:9632
%K Stickoxide , Rhodium, Katalyse , periodisch wechselnden mageren/fetten Bedingungen , detaillierter Reaktionsmechanismus SimulationNitric oxides , Rhodium , Catalysis , Transient lean-rich cycling , Detailed mechanism simulation
%R 10.11588/heidok.00009632
%T Detailed Modeling and Simulation of Automotive Exhaust NOx Reduction over Rhodium under Transient Lean-Rich Conditions
%U https://archiv.ub.uni-heidelberg.de/volltextserver/9632/
%X In this thesis, processes on a rhodium based catalytic NOx decomposition/reduction system operated under periodic lean/rich conditions are considered. The kinetic behavior of this system is simulated using a module of the CFD package DETCHEM, which treats the transient processes in the chemically reactive flow and couples those to microkinetic simulations based on multi-step reaction mechanisms. A detailed reaction mechanism over rhodium is extended and presented. The mechanism consists of oxidation reactions of CO and hydrogen and reduction reactions of NOx. The impact of temperature and temporal periods of the lean and rich phases on conversion of the pollutants is discussed. The trends of the experimentally observed and numerically predicted dynamic behaviors of the catalytic system agree well. The model could be applied in the design/optimization of catalytic exhaust after-treatment devices. Furthermore, this work potentially contributes to the development of applicable catalysts for vehicles equipped with diesel engines, lean-operated gasoline engines such as gasoline direct injection (GDI) engines.