Heterojunctioned CuO/Cu2O catalyst for highly efficient ozone removal

Guojun Ma; Wenxiang Tang; Anqi Wang; Le Zhang; Jian Guan; Ning Han; Yunfa Chen

doi:10.1016/j.jes.2022.01.032

Heterojunctioned CuO/Cu₂O catalyst for highly efficient ozone removal

J Environ Sci (China). 2023 Mar:125:340-348. doi: 10.1016/j.jes.2022.01.032. Epub 2022 Jan 31.

Authors

Guojun Ma¹, Wenxiang Tang², Anqi Wang³, Le Zhang³, Jian Guan³, Ning Han⁴, Yunfa Chen⁵

Affiliations

¹ Key Laboratory of Science and Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
² School of Chemical Engineering, Sichuan University, Chengdu 610065, China.
³ Key Laboratory of Science and Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
⁴ Key Laboratory of Science and Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: nhan@ipe.ac.cn.
⁵ Key Laboratory of Science and Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: chenyf@ipe.ac.cn.

PMID: 36375919
DOI: 10.1016/j.jes.2022.01.032

Abstract

In recent years, near surface ozone pollution, has attracted more and more attention, which necessitates the development of high efficient and low cost catalysts. In this work, CuO/Cu₂O heterojunctioned catalyst is fabricated by heating Cu₂O at high temperature, and is adopted as ozone decomposition catalyst. The results show that after Cu₂O is heated at 180°C conversion of ozone increases from 75.2% to 89.3% at mass space velocity 1,920,000 cm³/(g·hr) in dry air with 1000 ppmV ozone, which indicates that this heterojunction catalyst is one of the most efficient catalysts reported at present. Catalysts are characterized by electron paramagnetic resonance spectroscopy and ultraviolet photoelectron spectroscopy, which confirmed that the heterojunction promotes the electron transfer in the catalytic process and creates more defects and oxygen vacancies in the CuO/Cu₂O interfaces. This procedure of manufacturing heterostructures would also be applicable to other metal oxide catalysts, and it is expected to be more widely applied to the synthesis of high-efficiency heterostructured catalysts in the future.

Keywords: Cu(2)O; CuO; Heterojunction; Ozone decomposition.

MeSH terms

Catalysis
Copper / chemistry
Oxides
Ozone* / chemistry

Substances

Ozone
cupric oxide
Copper
Oxides