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8290174 
Journal Article 
Remarkable MnO2 structure-dependent H2O promoting effect in HCHO oxidation at room temperature 
Ma, C; Sun, S; Lu, Hao; Hao, Z; Yang, C; Wang, Bin; Chen, C; Song, M; , 
2021 
Yes 
Journal of Hazardous Materials
ISSN: 0304-3894
EISSN: 1873-3336 
ELSEVIER 
AMSTERDAM 
414 
125542 
English 
33667806 
WOS:000663794200004 
H2O is often critical in determining the activity and stability of metal oxide catalysts for HCHO oxidation; however, synthesis of metal oxide catalysts with super resistance to H2O remains a challenging. Herein, we synthesized Akhtenskite-type MnO2 catalyst with Mn-O-Mn stretching along MnO6 octahedra layers, which promotes the utilization of the associatively adsorbed H2O. The activity and stability of formaldehyde oxidation at room temperature enhanced in humid air. Diffuse-reflectance infrared Fourier transform (DRIRFT) spectroscopy was used to characterize the H2O adsorption and intermediate species. The associatively adsorbed H2O promotes the oxidation of formaldehyde to CO2 via the formic acid intermediate. The service life of MnO2 is prolonged due to formic acid generation. MnO2 gradually deactivates when formic acid accumulates and forms formate and hydrogen carbonate species. This study provides significant insights into the development of a high-efficiency MnO2 catalyst for formaldehyde oxidation in humid air, and the developed MnO2 catalyst is a promising candidate for application in practical formaldehyde elimination. 
article; HCHO oxidation; MnO2 structure; Structure-dependent H2O effect; Room temperature; adsorption; ambient temperature; carbon dioxide; carbonates; catalysts; durability; formaldehyde; formates; formic acid; hydrogen; manganese dioxide; oxidation; spectroscopy