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

Research output: Contribution to journalArticlepeer-review

40 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 languageEnglish
JournalApplied Catalysis B: Environmental
DOIs
StateE-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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