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Article Dans Une Revue Journal of Hazardous Materials Année : 2021

Novel cryptomelane nanosheets for the superior catalytic combustion of oxygenated volatile organic compounds.

Résumé

This work offers a novel pathway to prepare cryptomelane manganese oxides nanosheets as an superior catalyst for the catalytic combustion of oxygenated volatile organic compounds. The tunnel cryptomelane manganese oxides nanosheets were prepared from layered birnessite via simultaneously tuning pH and molar ratio (ROK) of the redox-precipitation between oxalic acid and KMnO4. Thus, few-layered cryptomelane nanosheets possessing the most predominantly exposed (211) facet are generated at low pH (5.2–5.6), which intensifies the surface area of thin crystal cryptomelane nanosheets up to 177 m2 g-1 and weakens Mn-O bonds. Moreover, high ROK results in low manganese average oxidation state (AOS), greater oxygen vacancies and better low-temperature reduction and oxygen mobility. Such features significantly maneuver the catalytic activity of the cryptomelane nanosheets catalysts for the complete oxidation of oxygenated volatile organic compound (e.g., 2-propanol, acetone) at low temperature (170–230 °C). Moreover, the catalysts show high stability for 48 h. The presented catalyst discloses an avenue to address current obstacles in the catalytic oxidation of volatile organic compounds.

Domaines

Catalyse
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Dates et versions

hal-04125601 , version 1 (12-06-2023)

Identifiants

Citer

Minh Tuan Nguyen Dinh, Chinh Chien Nguyen, Manh Duy Phan, Minh Khoa Duong, Phuc Hoang Duy Nguyen, et al.. Novel cryptomelane nanosheets for the superior catalytic combustion of oxygenated volatile organic compounds.. Journal of Hazardous Materials, 2021, Journal of Hazardous Materials, 417, pp.126111. ⟨10.1016/j.jhazmat.2021.126111⟩. ⟨hal-04125601⟩
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