The effect of CuO loading on different method prepared CeO2 catalyst for toluene oxidation

Yiqing Zeng; Yanan Wang; Fujiao Song; Shule Zhang; Qin Zhong

doi:10.1016/j.scitotenv.2019.135635

The effect of CuO loading on different method prepared CeO₂ catalyst for toluene oxidation

Sci Total Environ. 2020 Apr 10:712:135635. doi: 10.1016/j.scitotenv.2019.135635. Epub 2019 Nov 20.

Authors

Yiqing Zeng¹, Yanan Wang¹, Fujiao Song², Shule Zhang³, Qin Zhong⁴

Affiliations

¹ School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.
² School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, PR China; Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, PR China.
³ School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China. Electronic address: shulezhang@163.com.
⁴ School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China. Electronic address: zq304@njust.edu.cn.

PMID: 31806306
DOI: 10.1016/j.scitotenv.2019.135635

Abstract

The support effect on CeO₂ supported CuO catalysts are extensively investigated, but few studies have been reported in volatile organic compounds (VOCs) oxidation. Herein, CuO was impregnated on three conventional method synthesized CeO₂ to study its impact on toluene total oxidation over CeO₂ at low temperature (≤280 °C). Characterization results demonstrated that the shape and specific surface area of CeO₂ affected the degree of CuO dispersion, which determine the interaction between CuO and CeO₂. CuO significantly enhanced the toluene adsorption capacity of CeO₂, but lots of oxygen vacancies were lost during its loading. Although strong CuCe interaction induced new oxygen vacancies, the increase or decrease of final amount was related to the original surface properties of CeO₂. Mechanism analysis suggested that the activation of oxygen on oxygen vacancies controlled the toluene oxidation reaction rate. Therefore, the promotion or inhibition effect of CuO on CeO₂ for toluene oxidation depends on physical and chemical properties. Through this study, we have drawn some valuable information in guiding the synthesis and design of CuO-CeO₂ based catalysts.

Keywords: CuO-CeO(2); Oxygen adsorption activation; Support effect; Toluene oxidation.