Sulfur poisoning mechanism of three way catalytic converter

Combining a detailed catalytic surface reaction mechanism with noble metal and promoter elementary reactions,a new three way catalytic reaction mechanism was established.Based on the new mechanism,steady condition numerical simulation was carried out,and the change of light off temperatures and conversion efficiency with various SO2 contents was gotten.By grey relational analysis,the relational grade between conversion efficiency and SO2 content was gotten.And,the result showed that SO2 content was the most important influence on C3H6 and NOx conversion efficiency.This provides an important reference to the improvement of activity design of TWC,and may provide guidance for the condition design and optimization of a catalytic converter.