Noble metal free, CeO^sub 2^/LaMnO^sub 3^ hybrid achieving efficient photo-thermal catalytic decomposition of volatile organic compounds under IR light

Large amounts of anthropogenic VOCs emissions give rise to photochemical smog and ground-level ozone. Currently, catalytic oxidation for VOCs elimination still requires energy-intensive high temperatures. Light-driven photo-thermocatalysis oxidation of VOCs holds great promise to substantially reduc...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2019-01, Vol.240, p.141
Main Authors: Li, Juan-Juan, Yu, En-Qi, Cai, Song-Cai, Chen, Xi, Chen, Jing, Jia, Hong-Peng, Xu, Yi-Jun
Format: Article
Language:English
Subjects:
Absorption
Anthropogenic factors
Carbon dioxide
Catalysis
Catalysts
Catalytic activity
Catalytic oxidation
Cerium oxides
Conversion
Decomposition
Diffuse reflectance spectroscopy
Electromagnetic absorption
Energy consumption
Fourier transforms
High temperature
I.R. radiation
Infrared radiation
Iridium
Irradiation
Lanthanum compounds
Light effects
Low temperature
Metals
Noble metals
Organic compounds
Oxidation
Photochemical smog
Photochemicals
Smog
Sustainable consumption
Sustainable development
Synergistic effect
Toluene
VOCs
Volatile organic compounds
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Summary:Large amounts of anthropogenic VOCs emissions give rise to photochemical smog and ground-level ozone. Currently, catalytic oxidation for VOCs elimination still requires energy-intensive high temperatures. Light-driven photo-thermocatalysis oxidation of VOCs holds great promise to substantially reduce energy consumption for sustainable development in comparison with conventional thermal-based catalytic oxidation. Herein, CeO2/LaMnO3 composite, featuring the broad light wavelength absorption (800∼1800 nm), can be used as a highly active photo-thermal responsive catalyst on VOCs decomposition under IR irradiation. The maximum photo-thermal conversion efficiency is able to reach 15.2% with a significant toluene conversion of 89% and CO2 yield of 87% under IR irradiation intensity of 280 mW/cm2, together with excellent stability of nearly 30 h. Comparative characterizations reveal that such photo-thermal catalytic activity enhancement is predominantly attributed to the synergistic effects of ultrabroadband strong light absorption, efficient light-to-heat conversion, good low temperature reducibility and high lattice oxygen mobility, originating from an intense interaction of LaMnO3 with CeO2. Toluene oxidation reaction on CeO2/LaMnO3 catalyst proceeds via a Mars-van Krevelen mechanism as evidenced by in situ diffuse reflectance infrared Fourier transform spectroscopy.
ISSN:0926-3373
1873-3883