title: Synthesis of Ordered Mesoporous Manganese Oxides with Various Oxidation States.
abstract: Ordered mesoporous MnO, MnO4, Mn2O3 and MnO2 materials with 3-D pore structure were suc- cessfully synthesized via a nano-replication method by using ordered mesoporous silica, KIT-6 (Cubic Ia3d space group mesostructure) as the template under specific oxidation and reduction conditions. Notably, ordered mesoporous MnO with a crystalline wall (rock salt structure) was syn- thesized for the first time, to the best of our knowledge. The synthesis of the ordered mesoporous MnO was achieved by reducing the ordered mesoporous Mn3O4 under an H2 atmosphere, while preserving the ordered mesostructure and crystalline wall throughout the solid/solid transformation. All of the ordered mesoporous manganese oxides with different crystal structures and oxidation states demonstrated almost the same spherical-like morphology with several hundred nanometers of particles. The synthesized ordered mesoporous manganese oxides had uniform dual mesopores (2-3 nm, and ~20 nm) and crystalline frameworks with large surface areas (86-140 m2/g) and pore volumes (0.27-0.33 cm3/g).
authors.forename: Gwi Ok
authors.initials: GO
authors.lastname: Park
authors.forename: Jeong Kuk
authors.initials: JK
authors.lastname: Shon
authors.forename: Yong Ho
authors.initials: YH
authors.lastname: Kim
authors.forename: Ji Man
authors.initials: JM
authors.lastname: Kim
mesh_terms: D060326:Chemistry Techniques, Synthetic; D017895:Manganese Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000138:chemical synthesis* / Q000737:chemistry*; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry
chemical_list: D017895:Manganese Compounds; D010087:Oxides; C027424:manganese oxide; D012822:Silicon Dioxide