NO x storage and reduction properties of ceria-promoted lean NO x trap catalysts

Chuan Shi; Yaying Ji; Uschi Graham; Gary Jacobs; Todd J. Toops; Mark Crocker

NO _x storage and reduction properties of ceria-promoted lean NO _x trap catalysts

Chuan Shi, Yaying Ji, Uschi Graham, Gary Jacobs, Todd J. Toops, Mark Crocker

Research output: Contribution to journal › Conference article › peer-review

Abstract

As part of our investigations into the function of ceria in lean NOx trap catalysts, this study focuses on the use of ceria as a NOx storage component and as a support material. Model power catalysts were prepared in which ceria functioned either as a support for the main Ba NOx storage phase, or as the main NOx storage component itself. Relative to a ceria-free Pt/BaO/Al ₂O ₃ reference catalyst, catalysts containing both Ba and CeO ₂ were found to exhibit superior NO _x storage capacity at 200 and 300 °C, while analytical data indicated that the use of CeO ₂ as a support afforded more a highly dispersed Ba phase in comparison to Al2O ₃. In addition, regeneration behavior at low temperature was greatly improved by the presence of CeO ₂. These factors contributed to the superior NO _x storage-reduction performance exhibited by the CeO ₂-containing catalysts under lean-rich cycling conditions in the temperature range 200-300 °C.

Original language	English
Journal	ACS National Meeting Book of Abstracts
State	Published - 2011
Event	242nd ACS National Meeting and Exposition - Denver, CO, United States Duration: Aug 28 2011 → Sep 1 2011

ASJC Scopus subject areas

Chemistry (all)
Chemical Engineering (all)

Cite this

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title = "NO x storage and reduction properties of ceria-promoted lean NO x trap catalysts",

abstract = "As part of our investigations into the function of ceria in lean NOx trap catalysts, this study focuses on the use of ceria as a NOx storage component and as a support material. Model power catalysts were prepared in which ceria functioned either as a support for the main Ba NOx storage phase, or as the main NOx storage component itself. Relative to a ceria-free Pt/BaO/Al 2O 3 reference catalyst, catalysts containing both Ba and CeO 2 were found to exhibit superior NO x storage capacity at 200 and 300 °C, while analytical data indicated that the use of CeO 2 as a support afforded more a highly dispersed Ba phase in comparison to Al2O 3. In addition, regeneration behavior at low temperature was greatly improved by the presence of CeO 2. These factors contributed to the superior NO x storage-reduction performance exhibited by the CeO 2-containing catalysts under lean-rich cycling conditions in the temperature range 200-300 °C.",

author = "Chuan Shi and Yaying Ji and Uschi Graham and Gary Jacobs and Toops, {Todd J.} and Mark Crocker",

year = "2011",

language = "English",

note = "null ; Conference date: 28-08-2011 Through 01-09-2011",

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TY - JOUR

T1 - NO x storage and reduction properties of ceria-promoted lean NO x trap catalysts

AU - Shi, Chuan

AU - Ji, Yaying

AU - Graham, Uschi

AU - Jacobs, Gary

AU - Toops, Todd J.

AU - Crocker, Mark

PY - 2011

Y1 - 2011

N2 - As part of our investigations into the function of ceria in lean NOx trap catalysts, this study focuses on the use of ceria as a NOx storage component and as a support material. Model power catalysts were prepared in which ceria functioned either as a support for the main Ba NOx storage phase, or as the main NOx storage component itself. Relative to a ceria-free Pt/BaO/Al 2O 3 reference catalyst, catalysts containing both Ba and CeO 2 were found to exhibit superior NO x storage capacity at 200 and 300 °C, while analytical data indicated that the use of CeO 2 as a support afforded more a highly dispersed Ba phase in comparison to Al2O 3. In addition, regeneration behavior at low temperature was greatly improved by the presence of CeO 2. These factors contributed to the superior NO x storage-reduction performance exhibited by the CeO 2-containing catalysts under lean-rich cycling conditions in the temperature range 200-300 °C.

AB - As part of our investigations into the function of ceria in lean NOx trap catalysts, this study focuses on the use of ceria as a NOx storage component and as a support material. Model power catalysts were prepared in which ceria functioned either as a support for the main Ba NOx storage phase, or as the main NOx storage component itself. Relative to a ceria-free Pt/BaO/Al 2O 3 reference catalyst, catalysts containing both Ba and CeO 2 were found to exhibit superior NO x storage capacity at 200 and 300 °C, while analytical data indicated that the use of CeO 2 as a support afforded more a highly dispersed Ba phase in comparison to Al2O 3. In addition, regeneration behavior at low temperature was greatly improved by the presence of CeO 2. These factors contributed to the superior NO x storage-reduction performance exhibited by the CeO 2-containing catalysts under lean-rich cycling conditions in the temperature range 200-300 °C.

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Y2 - 28 August 2011 through 1 September 2011

ER -

NO _x storage and reduction properties of ceria-promoted lean NO _x trap catalysts

Abstract

ASJC Scopus subject areas

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