Study on the NOx Reduction Mechanism of Precious Metal Single-Nano Sized Catalyst during the Acceleration and Deceleration Region

Abstract

In this study, in-situ XAFS analysis was carried out under the condition of oxidizing and reducing gases at 773 K using a mass-produced catalyst that had deteriorated on an engine bench. As a results of the in-situ XAFS measurement, it is considered that the Rh particles of the Rh single-nano sized catalyst are likely to maintain the high activation state and return to the activation state quickly. Therefore, the NO_x purification performance of the Rh single-nano sized catalyst during the acceleration and deceleration region is improved than that of the Rh loaded catalyst.