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In Situ Time-Resolved Redox Dynamics of Pd Catalysts Under Oscillating A/F Conditions

  • Hiroshi Yoshida
  • Riichiro Kakei
  • Ayumi Fujiwara
  • Atsuko Tomita
  • Takeshi Miki
  • Masato Machida
Original Paper
  • 8 Downloads

Abstract

The redox dynamics of Pd catalysts under lean/rich perturbation conditions was analyzed by in situ time-resolved reflectance spectroscopy. The real-time redox of Pd/Al2O3 was monitored using the reflectance at 650 nm at every second under simulated exhausts (CO–C3H6–NO–O2), which were switched between air-to-fuel ratio of 14.1 (rich) and 15.0 (lean). Compared to the fast oxidation of metallic Pd (Pd0) upon rich-to-lean switching, the reduction of Pd oxide (Pd2+) upon reverse (lean-to-rich) switch started after a long induction period and proceeded slowly. Because the similar result was also observed for a Pd metal foil, the unequal redox rates under the lean/rich perturbation condition is characteristic of Pd. The temperature dependence of the redox rate demonstrated that the activation energy for the reduction of Pd oxide is greater than that of the Pd oxidation. The faster oxidation rate of Pd surface is considered as the primary reason for steep decrease of NO reduction efficiency in a slightly lean A/F region.

Keywords

Three-way catalysts Redox dynamics Palladium In situ reflectance spectroscopy 

Notes

Acknowledgements

Part of this work was supported by the MEXT program, “Elements Strategy Initiative to Form Core Research Center” (since 2012), which is run by MEXT (Ministry of Education Culture, Sports, Science and Technology), Japan.

Supplementary material

11244_2018_1100_MOESM1_ESM.docx (311 kb)
Supplementary material 1 (DOCX 310 KB)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Applied Chemistry and Biochemistry, Graduate School of Science and TechnologyKumamoto UniversityKumamotoJapan
  2. 2.Unit of Elements Strategy Initiative for Catalysts & Batteries (ESICB)Kyoto UniversityKyotoJapan
  3. 3.Inorganic Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)NagoyaJapan

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