TY - JOUR
T1 - Distinct structure-activity relationship and reaction mechanism over BaCoO3/CeO2 catalysts for NO direct decomposition
AU - Kang, Running
AU - Wang, Xuehai
AU - Huang, Junqin
AU - An, Sufeng
AU - Wang, Lu
AU - Wang, Gang
AU - Chen, Hong
AU - Zhang, Cuijuan
AU - Bin, Feng
AU - Li, Yongdan
N1 - Publisher Copyright:
© 2024 The Authors
PY - 2024/8/5
Y1 - 2024/8/5
N2 - 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.
AB - 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.
KW - BaCoO
KW - CeO morphology
KW - NO direct decomposition
KW - Perovskite
KW - Reaction mechanism
UR - http://www.scopus.com/inward/record.url?scp=85187790036&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2024.123952
DO - 10.1016/j.apcatb.2024.123952
M3 - Article
AN - SCOPUS:85187790036
SN - 0926-3373
VL - 350
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 123952
ER -