Abstract
Manganese oxide hollow spheres have been prepared by a facile, self-assembly synthesis and doped with Fe, Cu, V, and Ce. The materials have high surface areas and shells consisting of nanoplatelets. Two different sets of reactions were carried out: (1) with constant butyric acid concentration using 10:1 BA:Mn and (2) with adjusted butyric acid concentration using 10:1 BA:total metal (Mn+dopant). Dopants promote the formation of yolk structures within the hollow spheres, and at higher dopant:Mn ratios cause the spheres to fill. Increasing the butyric acid concentration likewise promotes yolk formation and sphere filing, as well as larger sphere size and loss of monodispersity. Manganese oxide hollow spheres are active catalysts in converting isopropanol to acetone, although doping does not improve catalyst performance except in the case of Cu.
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