Distinct structure-activity relationship and reaction mechanism over BaCoO3/CeO2 catalysts for NO direct decomposition

Running Kang, Xuehai Wang, Junqin Huang, Sufeng An, Lu Wang, Gang Wang*, Hong Chen, Cuijuan Zhang, Feng Bin*, Yongdan Li*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
42 Downloads (Pure)

Abstract

The dependency on morphology is crucial for achieving highly efficient direct decomposition of NO. Herein, a BaCoO3/CeO2 catalyst is synthesized using CeO2 small particles (p), spheres (s) and rods (r) as supports. The NO conversion to N2 (NTN2) at 800 °C follows the order BaCoO3/CeO2-r (78.8 %) > BaCoO3/CeO2-s (75.9 %) > BaCoO3/CeO2-p (56.9 %) > BaCoO3 (8.6 %) at a space velocity 1 g s/cm3. BaCoO3/CeO2-r exhibts high tolerance to O2 and stability with conversion decreasing from 78.8 % to 74.6 %, 60.0 % and 50.0 % at 800 °C with 1, 5 and 10 vol% O2, respectively. The high redox activity, higher active oxygen mobility and NO adsorption capability ensures its superior performance, while the high surface area (31.29 m2/g) and uniform distribution of active sites on the surface further promote the activity. The mechanism of NO direct decomposition is elucidated by in situ Diffuse reflectance infrared Fourier transform spectroscopy, 18O2 isotopic transient exchange experiments and density functional theory (DFT) calculation.

Original languageEnglish
Article number123952
Number of pages13
JournalApplied Catalysis B: Environmental
Volume350
Early online date15 Mar 2024
DOIs
Publication statusPublished - 5 Aug 2024
MoE publication typeA1 Journal article-refereed

Keywords

  • BaCoO
  • CeO morphology
  • NO direct decomposition
  • Perovskite
  • Reaction mechanism

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