激进的
甲苯
氧气
光化学
催化作用
化学
电子顺磁共振
过氧化物
燃烧
傅里叶变换红外光谱
辐照
活性氧
无机化学
化学工程
有机化学
核磁共振
工程类
核物理学
物理
生物化学
作者
Yuan-liang Hao,X. Zhang,H. Zhang,Yue-guang Ma,Ying Liu,Y. L. Li,Jun Zhao,F. Li
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2023-05-22
卷期号:6 (11): 9385-9396
被引量:1
标识
DOI:10.1021/acsanm.3c01114
摘要
To reveal the activity enhancement mechanism of volatile organic compounds (VOC) oxidation reaction, is vital for developing high-efficiency and cost-effective photothermocatalytic materials. Herein, porous and low-cost CeO2–MgO composite oxides were simply constructed via the solution combustion method and applied for toluene photothermocatalytic oxidation. The conversion rate for 1500 ppm of toluene over the optimized sample could reach 90% under the photothermocatalytic process at 330 °C and a gas hourly space velocity of 60,000 mL·g–1·h–1. Both gas phase oxygen and reactive oxygen species (ROS) played the dominant role in the photothermocatalytic activity while the total contribution rate of photoinduced holes and surface lattice oxygen was 25% to the activity. In situ Fourier transform infrared and electron paramagnetic resonance results revealed that the synergistic photothermo activation of molecular oxygen accelerated the low-temperature ROS formation. Under irradiation, photoinduced electrons could benefit the efficient transfer from superoxide radicals to peroxide radicals on material. Hence, it provides not only a comprehensive understanding on the activity enhancement mechanism at the molecular level but also a theoretical reference for designing objective catalysts for VOC abatement.
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