Positive effects of K+ in hybrid CoMn-K and Pd/Ba/Al2O3 catalysts for NOx storage and reduction

Zhifeng Bai; Bingbing Chen; Qi Zhao; Chuan Shi; Mark Crocker

doi:10.1016/j.apcatb.2019.01.095

Positive effects of K⁺ in hybrid CoMn-K and Pd/Ba/Al₂O₃ catalysts for NO_x storage and reduction

Zhifeng Bai, Bingbing Chen, Qi Zhao, Chuan Shi, Mark Crocker

Chemistry

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

15 Scopus citations

Abstract

CoMn-K was mechanically mixed with a Pd/Ba/Al₂O₃ catalyst to enhance its NO_x storage and reduction properties. The Pd/Ba/Al₂O₃ and CoMn-K mixture showed a synergetic effect with respect to NO_x storage capacity and improved NO_x reduction ability. The addition of K⁺ ions promoted the catalytic performance by increasing NO oxidation activity and therefore NO_x storage via the creation of active surface oxygen species on the catalysts. The stored NO_x reduction by H₂ was also improved, being ascribed to the fact that Pd was mainly present as Pd⁰ due to the electronic interactions between Pd and K⁺ ions. NO_x conversions and N₂ selectivity at low temperatures (80–200 °C) could be further enhanced by assistance of non-thermal plasma in rich phase.

Original language	English
Pages (from-to)	333-345
Number of pages	13
Journal	Applied Catalysis B: Environmental
Volume	249
DOIs	https://doi.org/10.1016/j.apcatb.2019.01.095
State	Published - Jul 15 2019

Bibliographical note

Funding Information:
The work was supported by the National Key R&D Program of China (No. 2017YFA0700103 ), and National Natural Foundation of China (Nos. 21577013 and 21707015 ).

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

Hybrid catalyst
NO storage and reduction
Non-thermal plasma
Potassium ions

ASJC Scopus subject areas

Catalysis
Environmental Science (all)
Process Chemistry and Technology

Access to Document

10.1016/j.apcatb.2019.01.095

Cite this

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title = "Positive effects of K+ in hybrid CoMn-K and Pd/Ba/Al2O3 catalysts for NOx storage and reduction",

abstract = "CoMn-K was mechanically mixed with a Pd/Ba/Al2O3 catalyst to enhance its NOx storage and reduction properties. The Pd/Ba/Al2O3 and CoMn-K mixture showed a synergetic effect with respect to NOx storage capacity and improved NOx reduction ability. The addition of K+ ions promoted the catalytic performance by increasing NO oxidation activity and therefore NOx storage via the creation of active surface oxygen species on the catalysts. The stored NOx reduction by H2 was also improved, being ascribed to the fact that Pd was mainly present as Pd0 due to the electronic interactions between Pd and K+ ions. NOx conversions and N2 selectivity at low temperatures (80–200 °C) could be further enhanced by assistance of non-thermal plasma in rich phase.",

keywords = "Hybrid catalyst, NO storage and reduction, Non-thermal plasma, Potassium ions",

author = "Zhifeng Bai and Bingbing Chen and Qi Zhao and Chuan Shi and Mark Crocker",

note = "Funding Information: The work was supported by the National Key R&D Program of China (No. 2017YFA0700103 ), and National Natural Foundation of China (Nos. 21577013 and 21707015 ). Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

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AU - Bai, Zhifeng

AU - Chen, Bingbing

AU - Zhao, Qi

AU - Shi, Chuan

AU - Crocker, Mark

N1 - Funding Information: The work was supported by the National Key R&D Program of China (No. 2017YFA0700103 ), and National Natural Foundation of China (Nos. 21577013 and 21707015 ). Publisher Copyright: © 2019 Elsevier B.V.

PY - 2019/7/15

Y1 - 2019/7/15

N2 - CoMn-K was mechanically mixed with a Pd/Ba/Al2O3 catalyst to enhance its NOx storage and reduction properties. The Pd/Ba/Al2O3 and CoMn-K mixture showed a synergetic effect with respect to NOx storage capacity and improved NOx reduction ability. The addition of K+ ions promoted the catalytic performance by increasing NO oxidation activity and therefore NOx storage via the creation of active surface oxygen species on the catalysts. The stored NOx reduction by H2 was also improved, being ascribed to the fact that Pd was mainly present as Pd0 due to the electronic interactions between Pd and K+ ions. NOx conversions and N2 selectivity at low temperatures (80–200 °C) could be further enhanced by assistance of non-thermal plasma in rich phase.

AB - CoMn-K was mechanically mixed with a Pd/Ba/Al2O3 catalyst to enhance its NOx storage and reduction properties. The Pd/Ba/Al2O3 and CoMn-K mixture showed a synergetic effect with respect to NOx storage capacity and improved NOx reduction ability. The addition of K+ ions promoted the catalytic performance by increasing NO oxidation activity and therefore NOx storage via the creation of active surface oxygen species on the catalysts. The stored NOx reduction by H2 was also improved, being ascribed to the fact that Pd was mainly present as Pd0 due to the electronic interactions between Pd and K+ ions. NOx conversions and N2 selectivity at low temperatures (80–200 °C) could be further enhanced by assistance of non-thermal plasma in rich phase.

KW - Hybrid catalyst

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KW - Non-thermal plasma

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