Abstract
The conversions of CO, NO and HC of TWC submitted to either cycling ageing (CA) or thermal ageing (TA) were compared. The results show a strong deactivation with TA catalysts, whereas the loss of activity is very moderate when using CA ageing. To understand these differences, the catalysts were analysed with different physical techniques (microscopy, TPR, TPD, infrared). These techniques have put in evidence different compositions (bulk and surface) between fresh, CA and TA catalysts. Indeed, TPR has allowed the distinction between two bulk phases on the fresh catalyst while only one phase remains on the CA catalyst. Equally, TPD and FTIR led to a partial elucidation of the surface composition and a good distinction of the different phenomena occurring during thermal ageing or oscillating ageing allowing the proposition scheme to represent ageing of a TWC.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
