Formaldehyde oxidation at room temperature over layered MnO2

In this study, the catalytic oxidation of formaldehyde present in ambient air at room temperature over MnO2 solids prepared by a simple redox reaction was investigated. For HCHO initial concentrations in the 0.49–4.02 mg/m3 range, the obtained MnO2-MS catalyst provided 100% conversion of HCHO at 25 ...

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Bibliographic Details
Published in:Catalysis communications 2021-05, Vol.153, p.106293, Article 106293
Main Authors: Qi, Qiuping, Zhang, Wenrui, Zhang, Yanshi, Bai, Guangming, Wang, Shiwei, Liang, Peng
Format: Article
Language:English
Subjects:
HCHO oxidation
Indoor pollution
MnO2
Redox reaction
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Summary:In this study, the catalytic oxidation of formaldehyde present in ambient air at room temperature over MnO2 solids prepared by a simple redox reaction was investigated. For HCHO initial concentrations in the 0.49–4.02 mg/m3 range, the obtained MnO2-MS catalyst provided 100% conversion of HCHO at 25 °C in ~1 h which was kept constant for additional 10 h time-on-stream. The characterization of MnO2-MS showed that the large concentration of manganese vacancies (defect sites) and active oxygen species on the surface of the layered MnO2 play a key role for the oxidation of HCHO performance of the catalyst. The layered MnO2-MS catalyst is rich in VMn and active oxygen on the surface and can effectively degrade HCHO into CO2 and H2O at room temperature. [Display omitted] •A simple and low-consumption preparation method of catalyst was provided.•δ-MnO2 with bilayer structure degrades HCHO completely at room temperature.•Consumption of VMn and active oxygen species was the key for high activity.•Degradation efficiency of deactivated MnO2 was restored to 100% after regeneration.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2021.106293