| The critical catalysts is vital for the calibration and certification of automobile OBD(on board diagnostic). High-temperature hydrothermal aging is one of common preparation methods for critical catalysts by China 5 emission regulation, however, the relationship between the aging temperature and the performance of the critical catalyst is not clear. In this paper, the same sample batch of catalysts were first aged at various temperatures, then tested their vehicle emissions, catalyst storage capacity(OSC) and specific surface area(BET), and investigated their correlations between individual indicator with ageing temperature. The results showed that the vehicle emission, OSC and BET performance slightly changed before reaching an inflection temperature, and that their performances sharply decreased with temperature. The inflection temperatures of vehicle emission, OSC and BET were slightly different. The inflection temperatures of OSC and BET are beneficial to narrow the annealing temperature range of critical catalysts, reduce the sample preparation number, and simplify the preparation process. |
