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

95 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.

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

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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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