Facile synthesis of porous manganese oxide K-OMS-2 materials and their catalytic activity for formaldehyde oxidation

Porous manganese oxide K-OMS-2 nanomaterials were successfully synthesized by a simple low-temperature method. Data collected from characterization methods affirmed the cryptomelane-type manganese oxide octahedral molecular sieve (OMS-2). With increase of reaction temperature, the nanoparticle morphology of K-OMS-2 with an average diameter of ca. 40 nm evolved into nanorod morphology with a diameter of ca. 40 nm and lengths of 50–500 nm. Results of catalytic tests revealed that K-OMS-2 nanoparticles show rather higher catalytic activity for complete oxidation of formaldehyde than K-OMS-2 nanorods. This simple, inexpensive, and environmentally friendly method may have the potential of being used in scaled-up of K-OMS-2 materials.

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► Porous manganese oxide K-OMS-2 nanomaterials were successfully synthesized by a simple soft chemistry route.
► K-OMS-2 nanoparticles show rather higher catalytic activity for complete oxidation of formaldehyde than K-OMS-2 nanorods.
► More than 64% of HCHO could be oxidized into CO2 at 100 °C over the K-OMS-2 nanoparticles.