Enhanced low temperature catalytic activity for toluene oxidation over core-shell LaMnO3@α-MnO2 catalyst with oxygen vacancies

Jing Huang; Ruimei Fang; Xinyue Huang; Xiao'ai Luo; Yanjuan Sun; Fan Dong; Haibao Huang

Chemical Physics Impact (Dec 2022)

Enhanced low temperature catalytic activity for toluene oxidation over core-shell LaMnO3@α-MnO2 catalyst with oxygen vacancies

Jing Huang,
Ruimei Fang,
Xinyue Huang,
Xiao'ai Luo,
Yanjuan Sun,
Fan Dong,
Haibao Huang

Affiliations

Jing Huang: College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
Ruimei Fang: College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China; Corresponding authors at: College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China.
Xinyue Huang: College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China; Yangtze Delta Region Institute (Huzhou) & School of Resources and Environment, University of Electronic Science and Technology of China, Huzhou 313000, China
Xiao'ai Luo: College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China; Yangtze Delta Region Institute (Huzhou) & Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Huzhou 313000, China
Yanjuan Sun: College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China; Yangtze Delta Region Institute (Huzhou) & School of Resources and Environment, University of Electronic Science and Technology of China, Huzhou 313000, China; Corresponding authors at: College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China.
Fan Dong: College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China; Yangtze Delta Region Institute (Huzhou) & Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Huzhou 313000, China
Haibao Huang: School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510006, China

Journal volume & issue: Vol. 5
p. 100117

Abstract

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Engineering oxygen vacancies is an effective strategy to enhance the catalytic activity of MnO2 based composite oxides in heterogenous reactions, such as volatile organic compounds (VOCs) oxidation reaction. Core-shell structure LaMnO3@α-MnO2 catalysts were prepared by hydrothermal method via varying the concentrations of LaMnO3 and used in toluene oxidation reaction. Irregular core-shell structure L@M-10 catalyst exhibits excellent low temperature catalytic activity and stability, achieving 100% toluene removal efficiency at 200 °C. The light-off temperature (T50) and complete conversion temperature (T90) are 235 and 271 °C even after five repetitive cycles, respectively. The interfacial effect of L@M-10 sample promotes the generation of oxygen vacancies, facilitating the formation of active oxygen species. A possible oxidation reaction mechanism of toluene over L@M-10 catalyst was proposed in combination with the in-situ DRIFTS results. Fast ring-opening reaction and quick transformation of carboxylate or anhydride species into final products CO2 and H2O explains the superior catalytic property and stability of L@M-10 sample. This work highlights the effect of interface on the catalytic activity and stability of LaMnO3@α-MnO2 catalyst towards toluene oxidation and can offer a new insight into the utilization of interfacial effect in thermocatalytic reactions.

Published in Chemical Physics Impact

ISSN: 2667-0224 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics; Science: Chemistry
Website: https://www.journals.elsevier.com/chemical-physics-impact/

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