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Nanoporous manganese oxides were synthesized by a sol–gel method with maleic acid as an organic reducing agent. Noble metals (Pt and Ag) were then loaded by an impregnation method. The as-prepared materials are tunneled manganese oxides, cryptomelane (K-OMS-2). Further characterization was performed using X-ray diffraction (XRD), transmission electron microscopy (TEM) and N 2 adsorption/desorption...
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