Ceria-Based Catalysts for Low Temperature NOx Storage and Release

Samantha Jones; Yaying Ji; Mark Crocker

doi:10.1007/s10562-016-1704-y

Ceria-Based Catalysts for Low Temperature NO_x Storage and Release

Samantha Jones
, Yaying Ji
, Mark Crocker

Chemistry

Research output: Contribution to journal › Article › peer-review

68 Scopus citations

Abstract

CeO₂ promoted with either 1 wt% Pt or 1 wt% Pd was evaluated as a model system for passive NO_x adsorber applications. According to NO_x storage experiments conducted over the temperature range 80-160 °C, promotion with Pt resulted in higher NO_x storage efficiencies than for the Pd-promoted material. However, for NO_x storage at 80 and 120 °C, the latter released more NO_x below 350 °C during temperature-programmed desorption in relative and absolute terms, the Pt analog releasing most of its stored NO_x above 350 °C. DRIFT spectra showed that the use of Pd leads to preferential adsorption of NO_x in the form of nitrites, while predominately nitrate formation is observed over the Pt promoted material. Overall, the use of Pd promoted CeO₂ is preferred for low temperature NO_x storage and release due to its ability to store NO_x as thermally labile nitrites.

Original language	English
Pages (from-to)	909-917
Number of pages	9
Journal	Catalysis Letters
Volume	146
Issue number	5
DOIs	https://doi.org/10.1007/s10562-016-1704-y
State	Published - May 2016

Bibliographical note

Publisher Copyright:
© 2016 Springer Science+Business Media New York.

Funding

The authors thank Shelley Hopps for XRD measurements, as well as Drs. Christine Lambert and Joe Theis of Ford Motor Co. for helpful discussions. This project was funded by the National Science Foundation and the U.S. Department of Energy (DOE) under award no. CBET-1258742. However, any opinions, findings, conclusions, or recommendations expressed herein are those of the authors and do not necessarily reflect the views of the DOE.

Funders	Funder number
Shelley Hopps
U.S. Department of Energy Oak Ridge National Laboratory U.S. Department of Energy National Science Foundation National Energy Research Scientific Computing Center	CBET-1258742
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China	1258742

Keywords

Ceria
DRIFTS
Palladium
Passive NO adsorber
Platinum

ASJC Scopus subject areas

Catalysis
General Chemistry

Access to Document

10.1007/s10562-016-1704-y

Cite this

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abstract = "CeO2 promoted with either 1 wt\% Pt or 1 wt\% Pd was evaluated as a model system for passive NOx adsorber applications. According to NOx storage experiments conducted over the temperature range 80-160 °C, promotion with Pt resulted in higher NOx storage efficiencies than for the Pd-promoted material. However, for NOx storage at 80 and 120 °C, the latter released more NOx below 350 °C during temperature-programmed desorption in relative and absolute terms, the Pt analog releasing most of its stored NOx above 350 °C. DRIFT spectra showed that the use of Pd leads to preferential adsorption of NOx in the form of nitrites, while predominately nitrate formation is observed over the Pt promoted material. Overall, the use of Pd promoted CeO2 is preferred for low temperature NOx storage and release due to its ability to store NOx as thermally labile nitrites.",

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N2 - CeO2 promoted with either 1 wt% Pt or 1 wt% Pd was evaluated as a model system for passive NOx adsorber applications. According to NOx storage experiments conducted over the temperature range 80-160 °C, promotion with Pt resulted in higher NOx storage efficiencies than for the Pd-promoted material. However, for NOx storage at 80 and 120 °C, the latter released more NOx below 350 °C during temperature-programmed desorption in relative and absolute terms, the Pt analog releasing most of its stored NOx above 350 °C. DRIFT spectra showed that the use of Pd leads to preferential adsorption of NOx in the form of nitrites, while predominately nitrate formation is observed over the Pt promoted material. Overall, the use of Pd promoted CeO2 is preferred for low temperature NOx storage and release due to its ability to store NOx as thermally labile nitrites.

AB - CeO2 promoted with either 1 wt% Pt or 1 wt% Pd was evaluated as a model system for passive NOx adsorber applications. According to NOx storage experiments conducted over the temperature range 80-160 °C, promotion with Pt resulted in higher NOx storage efficiencies than for the Pd-promoted material. However, for NOx storage at 80 and 120 °C, the latter released more NOx below 350 °C during temperature-programmed desorption in relative and absolute terms, the Pt analog releasing most of its stored NOx above 350 °C. DRIFT spectra showed that the use of Pd leads to preferential adsorption of NOx in the form of nitrites, while predominately nitrate formation is observed over the Pt promoted material. Overall, the use of Pd promoted CeO2 is preferred for low temperature NOx storage and release due to its ability to store NOx as thermally labile nitrites.

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