The effect of the ageing procedure upon the activity of a three way catalyst working under transient conditions

摘要

The mode of ageing of a model three-way catalyst has been studied. Ageing with fixed and oscillating as constituents differs from conventional thermal ageing. The catalysts were characterised by their reactivity under transient conditions, by Temperature Programmed Reduction and by TEM. Under conditions of oscillating gas constituents, wich are near the actual use conditions, and even at high temperature, almost no deactivation was observed while thermal ageing led to a severe sintering of the metallic phase Pt-Rh.