purification performance evaluation method of the catalyst, the evaluation device, the exhaust gas purification device for an engine, exhaust gas purification of engine purification performance evaluation method iodide catalyst

摘要

PROBLEM TO BE SOLVED: To provide a method of evaluating purification performance of an exhaust gas purifying catalyst 11 during a transient period from a state of low-temperature and lean air-fuel ratio atmosphere to a rich air-fuel ratio state.;SOLUTION: The air-fuel ratio of an atmosphere of the catalyst 11 is changed from lean to rich. NOx purifying speed of the catalyst 11 while a simulant exhaust gas with the new rich air-fuel ratio is supplied is calculated. The exhaust gas purification performance of the catalyst 11 is evaluated based on the NOx purifying speed.;COPYRIGHT: (C)2013,JPO&INPIT