NOx storage and reduction properties of model manganese-based lean NOx trap catalysts

Zhao shun Zhang; Bing bing Chen; Xin kui Wang; Li Xu; Chak Tong AU; Chuan Shi; Mark Crocker

doi:10.1016/j.apcatb.2014.10.001

NO_x storage and reduction properties of model manganese-based lean NO_x trap catalysts

Zhao shun Zhang, Bing bing Chen, Xin kui Wang, Li Xu, Chak Tong AU, Chuan Shi^*, Mark Crocker

^*Corresponding author for this work

Department of Chemistry

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

52 Citations (Scopus)

Abstract

In order to study the role of manganese in LNT catalysis, model Pd/Mn/Ba/Al, Pd/Mn/Al and Pd/Ba/Al catalysts were prepared and characterized. Both Mn-containing catalysts exhibited higher activity for NO oxidation to NO₂ than the Pd/Ba/Al reference catalyst, although NO_x-TPD experiments showed that adsorbed NO_x species were weakly bound on Pd/Mn/Al. Consequently, the presence of Ba was essential for high storage capacity. Compared to the Pd/Ba/Al reference, Pd/Mn/Ba/Al showed significantly improved NO_x conversion under lean-rich cycling conditions as a consequence of its increased activity for NO oxidation and hence, superior NO_x storage efficiency. In addition, the presence of Mn greatly lessened the inhibiting effects of H₂O and CO₂ on cycle-averaged NO_x conversion, this being due to the facile decomposition of manganese carbonate at low temperatures as evidenced by DRIFTS. Significantly, the Pd/Mn/Ba/Al catalyst displayed comparable activity to a traditional LNT catalyst of the Pt/Ba/Al type, showing the promising prospect of such new type of LNT catalysts.

Original language	English
Pages (from-to)	232-244
Number of pages	13
Journal	Applied Catalysis B: Environmental
Volume	165
DOIs	https://doi.org/10.1016/j.apcatb.2014.10.001
Publication status	Published - 1 Apr 2015

Scopus Subject Areas

Catalysis
Environmental Science(all)
Process Chemistry and Technology

User-Defined Keywords

Manganese
NO oxidation
NO adsorber
NO storage-reduction
Palladium

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10.1016/j.apcatb.2014.10.001

Cite this

@article{906cb5ebb47244b8890391abbce65972,

title = "NOx storage and reduction properties of model manganese-based lean NOx trap catalysts",

abstract = "In order to study the role of manganese in LNT catalysis, model Pd/Mn/Ba/Al, Pd/Mn/Al and Pd/Ba/Al catalysts were prepared and characterized. Both Mn-containing catalysts exhibited higher activity for NO oxidation to NO2 than the Pd/Ba/Al reference catalyst, although NOx-TPD experiments showed that adsorbed NOx species were weakly bound on Pd/Mn/Al. Consequently, the presence of Ba was essential for high storage capacity. Compared to the Pd/Ba/Al reference, Pd/Mn/Ba/Al showed significantly improved NOx conversion under lean-rich cycling conditions as a consequence of its increased activity for NO oxidation and hence, superior NOx storage efficiency. In addition, the presence of Mn greatly lessened the inhibiting effects of H2O and CO2 on cycle-averaged NOx conversion, this being due to the facile decomposition of manganese carbonate at low temperatures as evidenced by DRIFTS. Significantly, the Pd/Mn/Ba/Al catalyst displayed comparable activity to a traditional LNT catalyst of the Pt/Ba/Al type, showing the promising prospect of such new type of LNT catalysts.",

keywords = "Manganese, NO oxidation, NO adsorber, NO storage-reduction, Palladium",

author = "Zhang, {Zhao shun} and Chen, {Bing bing} and Wang, {Xin kui} and Li Xu and AU, {Chak Tong} and Chuan Shi and Mark Crocker",

note = "Funding Information: The work was supported by the National Natural Science Foundation of China (Nos. 21373037 , 21073024 and 21176037 ). MC thanks the National Science Foundation and the U.S. Department of Energy (DOE) for financial support 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. ",

year = "2015",

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day = "1",

doi = "10.1016/j.apcatb.2014.10.001",

language = "English",

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TY - JOUR

T1 - NOx storage and reduction properties of model manganese-based lean NOx trap catalysts

AU - Zhang, Zhao shun

AU - Chen, Bing bing

AU - Wang, Xin kui

AU - Xu, Li

AU - AU, Chak Tong

AU - Shi, Chuan

AU - Crocker, Mark

N1 - Funding Information: The work was supported by the National Natural Science Foundation of China (Nos. 21373037 , 21073024 and 21176037 ). MC thanks the National Science Foundation and the U.S. Department of Energy (DOE) for financial support 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.

PY - 2015/4/1

Y1 - 2015/4/1

N2 - In order to study the role of manganese in LNT catalysis, model Pd/Mn/Ba/Al, Pd/Mn/Al and Pd/Ba/Al catalysts were prepared and characterized. Both Mn-containing catalysts exhibited higher activity for NO oxidation to NO2 than the Pd/Ba/Al reference catalyst, although NOx-TPD experiments showed that adsorbed NOx species were weakly bound on Pd/Mn/Al. Consequently, the presence of Ba was essential for high storage capacity. Compared to the Pd/Ba/Al reference, Pd/Mn/Ba/Al showed significantly improved NOx conversion under lean-rich cycling conditions as a consequence of its increased activity for NO oxidation and hence, superior NOx storage efficiency. In addition, the presence of Mn greatly lessened the inhibiting effects of H2O and CO2 on cycle-averaged NOx conversion, this being due to the facile decomposition of manganese carbonate at low temperatures as evidenced by DRIFTS. Significantly, the Pd/Mn/Ba/Al catalyst displayed comparable activity to a traditional LNT catalyst of the Pt/Ba/Al type, showing the promising prospect of such new type of LNT catalysts.

AB - In order to study the role of manganese in LNT catalysis, model Pd/Mn/Ba/Al, Pd/Mn/Al and Pd/Ba/Al catalysts were prepared and characterized. Both Mn-containing catalysts exhibited higher activity for NO oxidation to NO2 than the Pd/Ba/Al reference catalyst, although NOx-TPD experiments showed that adsorbed NOx species were weakly bound on Pd/Mn/Al. Consequently, the presence of Ba was essential for high storage capacity. Compared to the Pd/Ba/Al reference, Pd/Mn/Ba/Al showed significantly improved NOx conversion under lean-rich cycling conditions as a consequence of its increased activity for NO oxidation and hence, superior NOx storage efficiency. In addition, the presence of Mn greatly lessened the inhibiting effects of H2O and CO2 on cycle-averaged NOx conversion, this being due to the facile decomposition of manganese carbonate at low temperatures as evidenced by DRIFTS. Significantly, the Pd/Mn/Ba/Al catalyst displayed comparable activity to a traditional LNT catalyst of the Pt/Ba/Al type, showing the promising prospect of such new type of LNT catalysts.

KW - Manganese

KW - NO oxidation

KW - NO adsorber

KW - NO storage-reduction

KW - Palladium

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