Investigation into the Phase–Activity Relationship of MnO2 Nanomaterials toward Ozone-Assisted Catalytic Oxidation of Toluene

Ruijie Yang, Zhongjie Guo, Lixin Cai, Rongshu Zhu, Yingying Fan, Yuefeng Zhang, Pingping Han, Wanjian Zhang, Xiangang Zhu, Qitong Zhao, Zhenye Zhu, Chak Keung Chan, Zhiyuan Zeng

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Manganese dioxide (MnO2), 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 MnO2. In this study, six types of MnO2 with crystal phases corresponding to α-, β-, γ-, ε-, λ-, and δ-MnO2 are prepared, and their catalytic activity toward ozone-assisted catalytic oxidation of toluene at room temperature are studied, which follow the order of δ-MnO2 > α-MnO2 > ε-MnO2 > γ-MnO2 > λ-MnO2 > β-MnO2. Further investigation of the specific oxygen species with the toluene oxidation activity indicates that high catalytic activity of MnO2 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 MnO2 catalysts, which sheds light on strategies of rational design and synthesis of multiphase MnO2 catalysts for volatile organic pollutants’ (VOCs) degradation.
Original languageEnglish (US)
JournalSmall
Volume17
Issue number50
DOIs
StatePublished - Dec 1 2021
Externally publishedYes

ASJC Scopus subject areas

  • General Medicine

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