Διερεύνηση της συμπεριφοράς καταλυτικών μετατροπέων ως συνάρτηση της δομής και της πυκνότητας κυψελών

Abstract

The catalytic converter is the pollutant emission control device that converts toxic gases into less toxic ones. This thesis aims to investigate the phenomenon of backpressure and the behaviour of the catalyst as a function of its cell density (CPSI) and cell wall thickness. The key conclusions are that the backpressure effect is gradually more intense the denser the catalytic converter is. Chemkin analyses show that as cell density and wall thickness increase, unburned hydrocarbons and harmful exhaust gases decrease. However, a dense catalytic converter can be replaced with a less dense catalytic converter but with greater wall thicknesses to achieve same results. In this way, it is possible to not only vsave on catalyst production costs due to the cutoff of precious metals but also the negative effects of the backpressure phenomenon.