甲苯
催化作用
锰
催化氧化
氧气
臭氧
相(物质)
材料科学
化学工程
化学
纳米材料
无机化学
有机化学
纳米技术
工程类
作者
Ruijie Yang,Zhongjie Guo,Lixiong Cai,Rongshu Zhu,Yingying Fan,Yuefeng Zhang,Pingping Han,Wanjian Zhang,Xiangang Zhu,Qitong Zhao,Zhenye Zhu,Chak K. Chan,Zhiyuan Zeng
出处
期刊:Small
[Wiley]
日期:2021-10-31
卷期号:17 (50)
被引量:71
标识
DOI:10.1002/smll.202103052
摘要
Abstract Manganese dioxide (MnO 2 ), with naturally abundant crystal phases, is one of the most active candidates for toluene degradation. However, it remains ambiguous and controversial of the phase–activity relationship and the origin of the catalytic activity of these multiphase MnO 2 . In this study, six types of MnO 2 with crystal phases corresponding to α‐, β‐, γ‐, ε‐, λ‐, and δ‐MnO 2 are prepared, and their catalytic activity toward ozone‐assisted catalytic oxidation of toluene at room temperature are studied, which follow the order of δ‐MnO 2 > α‐MnO 2 > ε‐MnO 2 > γ‐MnO 2 > λ‐MnO 2 > β‐MnO 2 . Further investigation of the specific oxygen species with the toluene oxidation activity indicates that high catalytic activity of MnO 2 is originated from the rich oxygen vacancy and the strong mobility of oxygen species. This work illustrates the important role of crystal phase in determining the oxygen vacancies’ density and the mobility of oxygen species, thus influencing the catalytic activity of MnO 2 catalysts, which sheds light on strategies of rational design and synthesis of multiphase MnO 2 catalysts for volatile organic pollutants’ (VOCs) degradation.
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