The influence of exhaust catalytic converter on the evolution of engine exhaust particulate matter
CHEN Zhengguo
YANG Xiaodong
LIU Qingyang
LIU Haoye
Abstract：To investigate the impact of the exhaust catalytic converter on the evolution of exhaust particles,the non-volatile particles and semi-volatile particles in the upstream and downstream of the exhaust catalytic converter of a direct injection gasoline engine are measured and analyzed.The results show that the influence of exhaust catalytic converter on exhaust particles includes two aspects:direct filtration and removal of nucleation precursors.Exhaust catalytic converter can directly filter non-volatile particles in high-temperature exhaust with a filtration efficiency of 20%-35%,and the filtration process includes the capture and oxidation of particles.Exhaust catalytic converter can also remove semi-volatile polycyclic aromatic hydrocarbons from the exhaust,thereby inhibiting the conversion of these components into semi-volatile particulate matter during the exhaust temperature reduction process in the exhaust.
Keywords：particulate matterexhaust catalytic convertergasoline engine
Publication Date：2025-01-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：9( 1-8,31 )