Insights into the structure-activity relationships of highly efficient CoMn oxides for the low temperature NH3-SCR of NOx

Qi Zhao; Bingbing Chen; Jin Li; Xianbin Wang; Mark Crocker; Chuan Shi

doi:10.1016/j.apcatb.2020.119215

Insights into the structure-activity relationships of highly efficient CoMn oxides for the low temperature NH₃-SCR of NO_x

Qi Zhao
, Bingbing Chen
, Jin Li
, Xianbin Wang
, Mark Crocker
, Chuan Shi

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

108 Scopus citations

Abstract

A series of CoMn composite oxides with lamellar morphology was prepared by co-precipitation for low temperature selective catalytic reduction of NO_x with NH₃. CoMn oxide calcined at 250 °C (CoMn-LS-250) exhibited high activity, giving 91 % NO_x conversion at 60 °C with good SO₂ resistance (300 °C). The excellent activity of CoMn-LS-250 is related to its abundance of Lewis acid sites as well as its superior redox ability; consequently, the catalyst is able to trap NH₃ and oxidize NH₃(ad) to NH₂(ad), this being the initial step for NH₃-SCR of NO_x. NH₂(ad) subsequently combines with NO to form the key intermediate, NH₂NO(ad), which decomposes at low temperature (ca. 85 °C) with release of N₂. Residual OH(ad) reacts with gaseous O₂ to complete the redox cycle.

Original language	English
Article number	119215
Journal	Applied Catalysis B: Environmental
Volume	277
DOIs	https://doi.org/10.1016/j.apcatb.2020.119215
State	Published - Nov 15 2020

Bibliographical note

Publisher Copyright:
© 2020 Elsevier B.V.

Funding

The work was supported by the National Key R&D Program of China (No. 2017YFA0700103 ), National Natural Science Foundation of China (Nos. 21932002 , 21872014 , 21707015 , 21577013 ) and the Fundamental Research Funds for the Central Universities DUT19LK04. The work was supported by the National Key R&D Program of China (No. 2017YFA0700103), National Natural Science Foundation of China (Nos. 21932002, 21872014, 21707015, 21577013) and the Fundamental Research Funds for the Central Universities DUT19LK04.

Funders	Funder number
National Key Basic Research Program of China
National Natural Science Foundation of China (NSFC)	21577013, 21707015, 21872014, 21932002
National Natural Science Foundation of China (NSFC)
National Key Basic Research and Development Program of China	2017YFA0700103
National Key Basic Research and Development Program of China
Fundamental Research Funds for the Central Universities	DUT19LK04
Fundamental Research Funds for the Central Universities

Keywords

CoMn oxide
NH-SCR
NO
Structure-Activity relationships

ASJC Scopus subject areas

Catalysis
General Environmental Science
Process Chemistry and Technology

Access to Document

10.1016/j.apcatb.2020.119215

Cite this

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title = "Insights into the structure-activity relationships of highly efficient CoMn oxides for the low temperature NH3-SCR of NOx",

abstract = "A series of CoMn composite oxides with lamellar morphology was prepared by co-precipitation for low temperature selective catalytic reduction of NOx with NH3. CoMn oxide calcined at 250 °C (CoMn-LS-250) exhibited high activity, giving 91 \% NOx conversion at 60 °C with good SO2 resistance (300 °C). The excellent activity of CoMn-LS-250 is related to its abundance of Lewis acid sites as well as its superior redox ability; consequently, the catalyst is able to trap NH3 and oxidize NH3(ad) to NH2(ad), this being the initial step for NH3-SCR of NOx. NH2(ad) subsequently combines with NO to form the key intermediate, NH2NO(ad), which decomposes at low temperature (ca. 85 °C) with release of N2. Residual OH(ad) reacts with gaseous O2 to complete the redox cycle.",

keywords = "CoMn oxide, NH-SCR, NO, Structure-Activity relationships",

author = "Qi Zhao and Bingbing Chen and Jin Li and Xianbin Wang and Mark Crocker and Chuan Shi",

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year = "2020",

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doi = "10.1016/j.apcatb.2020.119215",

language = "English",

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T1 - Insights into the structure-activity relationships of highly efficient CoMn oxides for the low temperature NH3-SCR of NOx

AU - Zhao, Qi

AU - Chen, Bingbing

AU - Li, Jin

AU - Wang, Xianbin

AU - Crocker, Mark

AU - Shi, Chuan

PY - 2020/11/15

Y1 - 2020/11/15

N2 - A series of CoMn composite oxides with lamellar morphology was prepared by co-precipitation for low temperature selective catalytic reduction of NOx with NH3. CoMn oxide calcined at 250 °C (CoMn-LS-250) exhibited high activity, giving 91 % NOx conversion at 60 °C with good SO2 resistance (300 °C). The excellent activity of CoMn-LS-250 is related to its abundance of Lewis acid sites as well as its superior redox ability; consequently, the catalyst is able to trap NH3 and oxidize NH3(ad) to NH2(ad), this being the initial step for NH3-SCR of NOx. NH2(ad) subsequently combines with NO to form the key intermediate, NH2NO(ad), which decomposes at low temperature (ca. 85 °C) with release of N2. Residual OH(ad) reacts with gaseous O2 to complete the redox cycle.

AB - A series of CoMn composite oxides with lamellar morphology was prepared by co-precipitation for low temperature selective catalytic reduction of NOx with NH3. CoMn oxide calcined at 250 °C (CoMn-LS-250) exhibited high activity, giving 91 % NOx conversion at 60 °C with good SO2 resistance (300 °C). The excellent activity of CoMn-LS-250 is related to its abundance of Lewis acid sites as well as its superior redox ability; consequently, the catalyst is able to trap NH3 and oxidize NH3(ad) to NH2(ad), this being the initial step for NH3-SCR of NOx. NH2(ad) subsequently combines with NO to form the key intermediate, NH2NO(ad), which decomposes at low temperature (ca. 85 °C) with release of N2. Residual OH(ad) reacts with gaseous O2 to complete the redox cycle.

KW - CoMn oxide

KW - NH-SCR

KW - NO

KW - Structure-Activity relationships

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