Interfacial Oxygen Vacancies at Co3O4-CeO2 Heterointerfaces Boost the Catalytic Reduction of NO by CO in the Presence of O2

Shaomian Liu; Wenjuan Xue; Yongjun Ji; Wenqing Xu; Wenxing Chen; Lihua Jia; Tingyu Zhu; Ziyi Zhong; Guangwen Xu; Donghai Mei; Fabing Su

doi:10.1016/j.apcatb.2022.122151

Interfacial Oxygen Vacancies at Co3O4-CeO2 Heterointerfaces Boost the Catalytic Reduction of NO by CO in the Presence of O2

Shaomian Liu, Wenjuan Xue, Yongjun Ji^*, Wenqing Xu, Wenxing Chen^*, Lihua Jia, Tingyu Zhu, Ziyi Zhong, Guangwen Xu^*, Donghai Mei^*, Fabing Su^*

^*Corresponding author for this work

Chemical Engineering

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

39 Scopus citations

Abstract

Simultaneously improving both NOx conversion and N2 selectivity in the selective catalytic reduction of NO by CO (CO-SCR) under O2-containing conditions is highly challenging because of the competitive reactions of NOx and CO with O2. Here, we demonstrate that the interfacial oxygen vacancies (IOVs) generated at the Co3O4-CeO2 heterointerfaces by ball-milling-induced strain can remarkably boost both NOx conversion and N2 selectivity in the temperature range of 100–400 °C. The Co3O4-CeO2-IOV catalyst achieved approximately 100% NOx conversion and 100% N2 selectivity (200–350 °C, 1–5 vol.% O2, and 20,000 h−1); even under 10 vol.% O2, it still showed good catalytic performance. The spectroscopy analysis and theoretical calculations reveal that compared with O2 activation, IOVs are more favorable for the rate-limiting step of NO adsorption and dissociation. This work provides an effective strategy to create IOVs within metal oxide composite catalysts using ball-milling-induced interfacial strain for improving CO-SCR performance.

Original language	English
Journal	Applied Catalysis B: Environmental
DOIs	https://doi.org/10.1016/j.apcatb.2022.122151
State	E-pub ahead of print - 9 Nov 2022

Keywords

Ball milling
Interfacial oxygen vacancies
Co3O4-CeO2 composites
CO-SCR
O2-containing conditions

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10.1016/j.apcatb.2022.122151

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@article{61c47b644f1047a28e2a8fd9c4a099bb,

title = "Interfacial Oxygen Vacancies at Co3O4-CeO2 Heterointerfaces Boost the Catalytic Reduction of NO by CO in the Presence of O2",

abstract = "Simultaneously improving both NOx conversion and N2 selectivity in the selective catalytic reduction of NO by CO (CO-SCR) under O2-containing conditions is highly challenging because of the competitive reactions of NOx and CO with O2. Here, we demonstrate that the interfacial oxygen vacancies (IOVs) generated at the Co3O4-CeO2 heterointerfaces by ball-milling-induced strain can remarkably boost both NOx conversion and N2 selectivity in the temperature range of 100–400 °C. The Co3O4-CeO2-IOV catalyst achieved approximately 100% NOx conversion and 100% N2 selectivity (200–350 °C, 1–5 vol.% O2, and 20,000 h−1); even under 10 vol.% O2, it still showed good catalytic performance. The spectroscopy analysis and theoretical calculations reveal that compared with O2 activation, IOVs are more favorable for the rate-limiting step of NO adsorption and dissociation. This work provides an effective strategy to create IOVs within metal oxide composite catalysts using ball-milling-induced interfacial strain for improving CO-SCR performance.",

keywords = "Ball milling, Interfacial oxygen vacancies, Co3O4-CeO2 composites, CO-SCR, O2-containing conditions",

author = "Shaomian Liu and Wenjuan Xue and Yongjun Ji and Wenqing Xu and Wenxing Chen and Lihua Jia and Tingyu Zhu and Ziyi Zhong and Guangwen Xu and Donghai Mei and Fabing Su",

year = "2022",

month = nov,

day = "9",

doi = "10.1016/j.apcatb.2022.122151",

language = "英语",

journal = "Applied Catalysis B: Environmental",

issn = "0926-3373",

publisher = "Elsevier",

}

TY - JOUR

T1 - Interfacial Oxygen Vacancies at Co3O4-CeO2 Heterointerfaces Boost the Catalytic Reduction of NO by CO in the Presence of O2

AU - Liu, Shaomian

AU - Xue, Wenjuan

AU - Ji, Yongjun

AU - Xu, Wenqing

AU - Chen, Wenxing

AU - Jia, Lihua

AU - Zhu, Tingyu

AU - Zhong, Ziyi

AU - Xu, Guangwen

AU - Mei, Donghai

AU - Su, Fabing

PY - 2022/11/9

Y1 - 2022/11/9

N2 - Simultaneously improving both NOx conversion and N2 selectivity in the selective catalytic reduction of NO by CO (CO-SCR) under O2-containing conditions is highly challenging because of the competitive reactions of NOx and CO with O2. Here, we demonstrate that the interfacial oxygen vacancies (IOVs) generated at the Co3O4-CeO2 heterointerfaces by ball-milling-induced strain can remarkably boost both NOx conversion and N2 selectivity in the temperature range of 100–400 °C. The Co3O4-CeO2-IOV catalyst achieved approximately 100% NOx conversion and 100% N2 selectivity (200–350 °C, 1–5 vol.% O2, and 20,000 h−1); even under 10 vol.% O2, it still showed good catalytic performance. The spectroscopy analysis and theoretical calculations reveal that compared with O2 activation, IOVs are more favorable for the rate-limiting step of NO adsorption and dissociation. This work provides an effective strategy to create IOVs within metal oxide composite catalysts using ball-milling-induced interfacial strain for improving CO-SCR performance.

AB - Simultaneously improving both NOx conversion and N2 selectivity in the selective catalytic reduction of NO by CO (CO-SCR) under O2-containing conditions is highly challenging because of the competitive reactions of NOx and CO with O2. Here, we demonstrate that the interfacial oxygen vacancies (IOVs) generated at the Co3O4-CeO2 heterointerfaces by ball-milling-induced strain can remarkably boost both NOx conversion and N2 selectivity in the temperature range of 100–400 °C. The Co3O4-CeO2-IOV catalyst achieved approximately 100% NOx conversion and 100% N2 selectivity (200–350 °C, 1–5 vol.% O2, and 20,000 h−1); even under 10 vol.% O2, it still showed good catalytic performance. The spectroscopy analysis and theoretical calculations reveal that compared with O2 activation, IOVs are more favorable for the rate-limiting step of NO adsorption and dissociation. This work provides an effective strategy to create IOVs within metal oxide composite catalysts using ball-milling-induced interfacial strain for improving CO-SCR performance.

KW - Ball milling

KW - Interfacial oxygen vacancies

KW - Co3O4-CeO2 composites

KW - CO-SCR

KW - O2-containing conditions

U2 - 10.1016/j.apcatb.2022.122151

DO - 10.1016/j.apcatb.2022.122151

M3 - 文章

SN - 0926-3373

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

ER -

Interfacial Oxygen Vacancies at Co3O4-CeO2 Heterointerfaces Boost the Catalytic Reduction of NO by CO in the Presence of O2

Abstract

Keywords

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