Core-shell CoCuOx@MOx (MNb, Ti and Ce) catalysts with outstanding durability and resistance to H2O for the catalytic combustion of o-dichlorobenzene

• Published in: The Science of the total environment 2023-02, Vol.860, p.160472-160472, Article 160472
• Main Authors: Wu, Shixing, Zhao, Haijun, Xi, Yuntai, Tang, Zhicheng, Zhang, Jiyi
• Format: Article
• Language: English
• Subjects: Acid site; Catalytic combustion; CoCuOx dodecahedron; Core-shell structures; CVOCs; Lattice oxygen species
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2022.160472

Configuring Co-based catalysts with excellent activity, durability, anti-H2O capability and superior chlorine resistance is an effective strategy for catalytic combustion of CVOCs. In this work, we elaborated a CoCuOx catalysts with the same core but different shell. The CoCuOx dodecahedron surface was successfully coated with shells of Nb2O5, TiO2, and CeO2 using a range of conventional synthesis methods. The prepared core-shell catalysts (CoCuOx@TiO2 and CoCuOx@Nb2O5) were found to generate plentiful acid sites and abundant lattice oxygen species, indicating a strong interaction between the core and shell layers that resulted in a significant enhancement of catalytic activity. Additionally, by-products generation was successfully controlled by acid sites and lattice oxygen species. More importantly, the core-shell structure design significantly improved the thermal stability and anti-H2O capability of the catalysts. Furthermore, the possible formation pathways and reaction mechanisms were proposed based on in-situ FTIR and selectivity analysis. [Display omitted] •The CoCuOx@MOx catalysts shows superior catalytic performance for CVOC elimination.•CoCuOx@TiO2 shows a high thermal stability and excellent Cl and H2O tolerance.•Strong acid sites and lattice oxygen are important for the elimination of CVOCs.•Interaction of the core-shell structure has been explored for catalytic efficiency.