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Synthesis of δ-MnO2 via ozonation routine for low temperature formaldehyde removal

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Synthesis of δ-MnO2 via ozonation routine for low temperature formaldehyde removal
Nowadays,it is still a challenge to prepared high efficiency and low cost formaldehyde(HCHO)removal catalysts in order to tackle the long-living indoor air pollution.Herein,δ-MnO2 is successfully synthesized by a facile ozonation strategy,where Mn2+is oxidized by ozone(O3)bubble in an alkaline solution.It presents one of the best catalytic proper-ties with a low 100％conversion temperature of 85℃ for 50 ppm of HCHO under a GHSV of 48,000 mL/(g·hr).As a comparison,more than 6 times far longer oxidation time is needed if O3 is replaced by O2.Characterizations show that ozonation process generates a differ-ent intermediate of tetragonal β-HMnO2,which would favor the quick transformation into the final product δ-MnO2,as compared with the relatively more thermodynamically stable monoclinic y-HMnO2 in the O2 process.Finally,HCHO is found to be decomposed into CO2 via formate,dioxymethylene and carbonate species as identified by room temperature in-situ diffuse reflectance infrared fourier transform spectroscopy.All these results show great potency of this facile ozonation routine for the highly active δ-MnO2 synthesis in order to remove the HCHO contamination.

δ-MnO2Ozone oxidationHCHO oxidationIn-situ DRIFTS

Guijun Fan、Yacong Guo、Shaohua Chai、Le Zhang、Jian Guan、Guojun Ma、Ning Han、Yunfa Chen

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State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China

College of Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

Key Laboratory of Science and Technology on Particle Materials,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 361021,China

Key Laboratory for Mechanics in Fluid Solid Coupling Systems,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China

School of Petrochemical Engineering & Environment,Zhejiang Ocean University,Zhoushan 316022,China

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δ-MnO2 Ozone oxidation HCHO oxidation In-situ DRIFTS

2025

10.1016/j.jes.2023.04.021

环境科学学报(英文版)
中科院生态环境研究中心

环境科学学报(英文版)

影响因子：0.862
ISSN：1001-0742
年,卷(期)：2025.147(1)