Synthesis of Crystalline OMS-2with Urea Hydrogen Peroxide and its Application in Aerobic Oxidation Reactions

摘要

Cryptomelane-type manganese oxide (OMS-2) was synthesized successfully using urea hydrogen peroxide (urea·H2O2) as the reductant in an acidic buffer solution. As-prepared crystalline material was fully characterized by XRD, BET, XPS, SEM and HRTEM. The results demonstrate that OMS-2 has nanofiber with short nanorod morphologies, very rich oxygen vacancy defects and more exposed crystal facets compared with ones synthe- sized with other H2O2-containing reductants. These unique properties make nanostructural OMS-2 an excellent heteroge- neous catalyst in aerobic oxidation reactions, such as selective oxidation of mercaptan and oxygenation of alkylarenes.