Developing a thermally stable Co/Ce-Sn catalyst via adding Sn for soot and CO oxidation

Meng Wang; Yan Zhang; Wenpo Shan; Yunbo Yu; Jingjing Liu; Hong He

doi:10.1016/j.isci.2022.104103

Developing a thermally stable Co/Ce-Sn catalyst via adding Sn for soot and CO oxidation

iScience. 2022 Mar 18;25(4):104103. doi: 10.1016/j.isci.2022.104103. eCollection 2022 Apr 15.

Authors

Meng Wang^{1

2}, Yan Zhang^{1

2}, Wenpo Shan^{1

2}, Yunbo Yu^{1

3

4}, Jingjing Liu³, Hong He^{1

3

4}

Affiliations

¹ Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
² 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.
³ State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
⁴ University of Chinese Academy of Sciences, Beijing 100049, China.

Abstract

The thermal stability of the catalysts is of particular importance but still a big challenge for working under harsh conditions at high temperature. In this study, we report a strategy to improve the thermal stability of the ceria-based catalyst via introducing Sn. XRD, Rietveld refinement, and other characterizations results indicated that the formation of Sn-Co solid solution plays a key role in the thermal stability of the catalyst. The developed ternary 3%Co/Ce_0.5Sn_0.5O₂ catalyst not only exhibits outstanding thermal stability and resistance to SO₂ and H₂O for soot oxidation from diesel vehicle exhaust but also remains extraordinary thermal stability for CO oxidation. Remarkably, even after thermal aging at 1000°C, it still possessed high catalytic activity similar to that of the fresh catalyst.

Keywords: Catalysis; Chemistry; Materials characterization; Thermal property.