1. Effects of CO on Pd/BEA Passive NO Adsorbers.
- Author
-
Vu, Anh, Luo, Jinyong, Li, Junhui, and Epling, William
- Subjects
- *
PALLADIUM catalysts , *CARBON monoxide , *NITRIC oxide , *HYDROCARBONS , *CHEMICAL reduction , *TEMPERATURE effect - Abstract
Cold-start emissions significantly contribute to total vehicular pollutant emission profiles. There has therefore been a significant amount of research focused on catalytic aftertreatment systems that can mitigate CO, hydrocarbon and NO emissions at low temperatures. Recently, passive NO adsorbers (PNAs) have been developed, and these can store or trap NO at low temperature and are designed to release the trapped NO at higher temperature ranges, where downstream NO reduction catalysts are active. Pd/BEA is reported to be one such PNA. In this study its NO storage at low temperatures and release at higher temperatures was characterized using temperature programmed (TP) experiments and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The influence of CO was investigated and was shown to improve the amount stored at low temperature and also induce higher temperature desorption, in a range that is applicable for downstream NO reduction. Without the reductant, NO release primarily occurred at temperatures too low to be practically relevant. Graphical Abstract: [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF