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

Shixing Wu; Haijun Zhao; Yuntai Xi; Zhicheng Tang; Jiyi Zhang

doi:10.1016/j.scitotenv.2022.160472

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

Sci Total Environ. 2023 Feb 20:860:160472. doi: 10.1016/j.scitotenv.2022.160472. Epub 2022 Nov 24.

Authors

Shixing Wu¹, Haijun Zhao², Yuntai Xi³, Zhicheng Tang⁴, Jiyi Zhang⁵

Affiliations

¹ State Key Laboratory for Oxo Synthesis and Selective Oxidation, and National Engineering Research Center for Fine Petrochemical Intermediates, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; School of Petroleum and Chemical, Lanzhou University of Technology, Lanzhou 730050, China.
² State Key Laboratory for Oxo Synthesis and Selective Oxidation, and National Engineering Research Center for Fine Petrochemical Intermediates, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering, Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing, Yantai 264006, China. Electronic address: zhaohaijun@licp.cas.cn.
³ School of Petroleum and Chemical, Lanzhou University of Technology, Lanzhou 730050, China.
⁴ State Key Laboratory for Oxo Synthesis and Selective Oxidation, and National Engineering Research Center for Fine Petrochemical Intermediates, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering, Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing, Yantai 264006, China. Electronic address: tangzhicheng@licp.cas.cn.
⁵ School of Petroleum and Chemical, Lanzhou University of Technology, Lanzhou 730050, China. Electronic address: zhangjiyi@lut.edu.cn.

PMID: 36436651
DOI: 10.1016/j.scitotenv.2022.160472

Abstract

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 CoCuO_x catalysts with the same core but different shell. The CoCuO_x dodecahedron surface was successfully coated with shells of Nb₂O₅, TiO₂, and CeO₂ using a range of conventional synthesis methods. The prepared core-shell catalysts (CoCuO_x@TiO₂ and CoCuO_x@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.

Keywords: Acid site; CVOCs; Catalytic combustion; CoCuO(x) dodecahedron; Core-shell structures; Lattice oxygen species.

MeSH terms

Cerium* / chemistry
Oxygen / chemistry
Titanium* / chemistry

Substances

titanium dioxide
Titanium
2-dichlorobenzene
Cerium
Oxygen