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. (C) 2010 Elsevier Inc. All rights reserved.