Comparison of NOx Adsorption/Desorption Behaviors over Pd/CeO2 and Pd/SSZ-13 as Passive NOx Adsorbers for Cold Start Application

  • Yongwoo Kim
  • Sungha Hwang
  • Jaeha Lee
  • YoungSeok Ryou
  • Hyokyoung Lee
  • Chang Hwan Kim
  • Do Heui KimEmail author
Special Issue: 2018 CLEERS Workshop, September 18-20, Ann Arbor, Michigan, United States


Passive NOx adsorber (PNA) is one of the promising technologies for reducing NOx emissions from vehicles during cold start periods. Precious metals supported on metal oxide and zeolite have been extensively investigated as PNA materials. Hence, it is worthwhile to compare two typical PNA materials, Pd/CeO2 and Pd/SSZ-13, so as to understand the differences between them. The NOx adsorption/desorption experiments were carried out under varying NO/NO2 ratios, and the result indicated that the NOx adsorption/desorption mechanisms on Pd/CeO2 and Pd/SSZ-13 are completely different. Specifically, NO and NO2 were competitively adsorbed on Pd/SSZ-13, while the NO adsorption on Pd/CeO2 was promoted by NO2. This difference is attributed to different adsorption sites: NOx is adsorbed on the ceria surface in Pd/CeO2, whereas it is adsorbed on atomic Pd2+ sites in Pd/SSZ-13, according to DRIFTS spectra in this study. In addition, the effect of sulfur poisoning was investigated as well. Pd/SSZ-13 showed moderate sulfur tolerance, while Pd/CeO2 completely lost its PNA ability after sulfur aging.


Passive NOx adsorber (PNA) Pd/CeO2 Pd/SSZ-13 Cold start Low temperature NO adsorption NO adsorption site 


Funding information

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (MSIP) (NRF2016R1A5A1009592).

Compliance with Ethical Standards

The authors declare that they have no competing interests.


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Yongwoo Kim
    • 1
  • Sungha Hwang
    • 1
  • Jaeha Lee
    • 1
  • YoungSeok Ryou
    • 1
  • Hyokyoung Lee
    • 2
  • Chang Hwan Kim
    • 2
  • Do Heui Kim
    • 1
    Email author
  1. 1.School of Chemical and Biological Engineering, Institute of Chemical ProcessesSeoul National UniversitySeoulRepublic of Korea
  2. 2.Hyundai-Kia Motors R&D CenterHwaseongRepublic of Korea

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