Deactivation mechanisms of Pt/Pd-based diesel oxidation catalysts

Journal Article

Currently precious metal-based diesel oxidation catalysts (DOC) containing platinum (Pt) and palladium (Pd) are most commonly used for the oxidation of hydrocarbon and NO in diesel exhaust hydrocarbon oxidation. The present work has been carried out to investigate the deactivation mechanisms of the DOC from its real-world vehicle operation by coupling its catalytic activity measurements with surface characterization including X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. A production Pt-Pd DOC was obtained after being aged on a vehicle driven for 135,000 miles in order to study its deactivation behavior. The performance of the vehicle-aged part was correlated with that of the simulated hydrothermal lab aged sample assuming that Pt-Pd sintering plays a major role in irreversible catalyst deactivation. In addition to the hydrothermal sintering, the deterioration of hydrocarbon and NO oxidation performance was caused by surface poisoning. The role of the various aging factors in determining long-term performance in mobile applications will be discussed. © 2011 Elsevier B.V.

Full Text

Duke Authors

Cited Authors

  • Wiebenga, MH; Kim, CH; Schmieg, SJ; Oh, SH; Brown, DB; Kim, DH; Lee, JH; Peden, CHF

Published Date

  • 2012

Published In

Volume / Issue

  • 184 / 1

Start / End Page

  • 197 - 204

International Standard Serial Number (ISSN)

  • 0920-5861

Digital Object Identifier (DOI)

  • 10.1016/j.cattod.2011.11.014