PROCESS FOR CHECKING THE OPERATABILITY OF AN EXHAUST GAS PURIFICATION CATALYST

摘要

The invention relates to a process for checking the operatability of an exhaust gas purification catalyst for diesel engines, which has a light-off temperature and a degree of conversion r co for carbon monoxide (CO), by direct measurement of the carbo n monoxide concentration in combination with a temperature measurement. The process is characterized in that to evaluate the remaining catalytic activity of the catalyst the difference .DELTA.T between the current catalyst exit temperature T E of the exhaust gas and the light-off temperature T CO,50%,fresh of the fresh catalyst for carbon monoxide stored as a function of speed and load .DELTA.T = T E - T CO, 50%,fresh is determined and the degree of conversion r co for carbon monoxide is evaluated.