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Emission Control Science and Technology
Published in: Emission Control Science and Technology 1/2017

23-12-2016 | Special Issue: 2016 CLEERS April 6-8, Ann Arbor, MI, USA

CeO2-M2O3 Passive NO x Adsorbers for Cold Start Applications

Authors: Samantha Jones, Yaying Ji, Agustín Bueno-Lopez, Yang Song, Mark Crocker

Published in: Emission Control Science and Technology | Issue 1/2017

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Abstract

Pt/CeO2-M2O3 and Pd/CeO2-M2O3 (M = La, Pr, Y, Sm, or Nd) were prepared by co-precipitation and impregnation and were investigated for potential passive NO x adsorber (PNA) use. During NO x storage at 120 °C, it was found that the amount of NO x stored as a function of time for Pt-promoted materials was higher than the Pd-promoted counterparts. For Pt/CeO2-M2O3 samples doped at the 5% level, NO x storage efficiency (NSE) followed the order Pr > Nd > Sm > Ce (undoped) > Y, La. Increasing dopant content from 5 to 20% decreased NSE in most cases, although in the case of Pr, NSE was increased. During subsequent NO x -temperature-programmed desorption (TPD), two NO x desorption events were apparent in all cases, the first occurring below 350 °C and the second occurring in the range 350–500 °C. Doping with Pr promoted the release of increased amounts of NO x below 350 °C compared to samples doped with other lanthanides; moreover, increasing the content of all doping metals except Pr shifted desorption peaks to higher temperatures, while the opposite trend was observed for Pr. Promotion with Pd was also examined, resulting in an increase of NO x desorption at low temperatures (<350 °C) relative to Pt. These results can be rationalized in terms of the ability of Pr to create vacancies in the CeO2 lattice, which facilitate NO x adsorption, and by the superior NO oxidation activity of Pt relative to Pd, which promotes NO x storage as nitrates possessing high thermal stability.
previous article Cold-Start Emission Reduction Potential and Limitations of Commercial Passive Hydrocarbon Adsorbers
next article Development of a Global Kinetic Model for a Commercial Lean NOx Trap Automotive Catalyst Based on Laboratory Measurements

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Appendix
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Metadata
Title
CeO2-M2O3 Passive NO x Adsorbers for Cold Start Applications
Authors
Samantha Jones
Yaying Ji
Agustín Bueno-Lopez
Yang Song
Mark Crocker
Publication date
23-12-2016
Publisher
Springer International Publishing
Published in
Emission Control Science and Technology / Issue 1/2017
Print ISSN: 2199-3629
Electronic ISSN: 2199-3637
DOI
https://doi.org/10.1007/s40825-016-0058-7

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