Quenching-induced surface modulation of perovskite oxides to boost catalytic oxidation activity

Peng Wu; Tingyu Chen; Xiaojing Jin; Shuaiqi Zhao; Yanan Chong; Yifei Li; Jiajin Lin; Anqi Li; Yun Zhao; Yongcai Qiu; Daiqi Ye

doi:10.1016/j.jhazmat.2022.128765

Quenching-induced surface modulation of perovskite oxides to boost catalytic oxidation activity

J Hazard Mater. 2022 Jul 5:433:128765. doi: 10.1016/j.jhazmat.2022.128765. Epub 2022 Apr 4.

Authors

Peng Wu¹, Tingyu Chen¹, Xiaojing Jin², Shuaiqi Zhao¹, Yanan Chong¹, Yifei Li¹, Jiajin Lin¹, Anqi Li¹, Yun Zhao³, Yongcai Qiu⁴, Daiqi Ye¹

Affiliations

¹ Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
² Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, China.
³ Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China. Electronic address: yunzhao@scut.edu.cn.
⁴ Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, China. Electronic address: ycqiu@scut.edu.cn.

PMID: 35390616
DOI: 10.1016/j.jhazmat.2022.128765

Abstract

Quenching is a powerful method for modulating surface structures of metal oxide nanocatalysts to achieve high catalytic oxidation activities, but it is still challenging. Herein, a catalyst of ultrafine Co₃O₄ nanoparticles decorated on Co-doped LaMnO₃ (Co₃O₄/LaCo_xMn_1-xO₃) is synthesized via one-step quenching perovskite-type LaMnO₃ nanocatalyst into an aqueous solution of cobalt nitrate, which exhibits significantly improved catalytic performance with toluene (1000 ppm) conversion of 90% at 269 °C under the gas hourly space velocity of 72000 mL g^-1 h^-1. The high catalytic activity correlates with large surface area, abundant oxygen vacancies and good reducibility. Furthermore, density functional theory calculations disclose that Co doping and interfacial effect of Co₃O₄/LaCo_xMn_1-xO₃ can achieve lower C-H bond activation energy. These findings provide a unique and effective route towards surface modification of nanocatalysts.

Keywords: Co doping; Interfacial effects; One-step quenching; Toluene.