Citation: Meng Wang, Yan Zhang, Yunbo Yu, Wenpo Shan, Hong He. High-temperature calcination dramatically promotes the activity of Cs/Co/Ce-Sn catalyst for soot oxidation[J]. Chinese Chemical Letters, ;2025, 36(1): 109928. doi: 10.1016/j.cclet.2024.109928 shu

High-temperature calcination dramatically promotes the activity of Cs/Co/Ce-Sn catalyst for soot oxidation

Meng Wang ^{a, b} ,
Yan Zhang ^{a, b, *,} ,
Yunbo Yu ^{a, c, d} ,
Wenpo Shan ^{a, b, *,} ,
Hong He ^{a, c, d}

a.
Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
b.
Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, Ningbo Urban Environment Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Ningbo 315800, China
c.
State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
d.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 24 November 2023
Revised Date: 24 March 2024
Accepted Date: 25 April 2024
Available Online: 25 April 2024

Figures(5)

Catalytic oxidation of soot is of great importance for emission control on diesel vehicles. In this work, a highly active Cs/Co/Ce-Sn catalyst was investigated for soot oxidation, and it was unexpectedly found that high-temperature calcination greatly improved the activity of the catalyst. When the calcination temperature was increased from 500 ℃ to 750 ℃, T₅₀ decreased from 456.9 ℃ to 389.8 ℃ in a NO/O₂/H₂O/N₂ atmosphere. Characterization results revealed that high-temperature calcination can promote the ability to transfer negative charge density from Cs to other metal cations in Cs/Co/Ce-Sn, which will facilitate the production of more oxygen defects and the generation of more surface-active oxygen species. Surface-active oxygen species are beneficial to the oxidation of NO to NO₂, leading to the high yield of NO₂ exploitation. Therefore, the Cs/Co/Ce-Sn catalyst calcined at 750 ℃ demonstrated higher activity than that calcined at 500 ℃. This work provides a pathway to prepare high efficiency catalysts for the removal of soot and significant insight into the effects of calcination on soot oxidation catalysts.
- Soot oxidation,
- Calcination,
- Surface defects,
- Surface-active oxygen species,
- NO₂
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