Citation:
Bingyang Bai, Qi Qiao, Junhua Li, Jiming Hao. Synthesis of three-dimensional ordered mesoporous MnO2 and its catalytic performance in formaldehyde oxidation[J]. Chinese Journal of Catalysis,
;2016, 37(1): 27-31.
doi:
10.1016/S1872-2067(15)61026-9
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Three-dimensional (3D) ordered mesoporous MnO2 was prepared using KIT-6 mesoporous molecular sieves as a hard template. The material was used for catalytic oxidation of HCHO. The material has high surface areas and the mesoporous characteristics of the template, with cubic symmetry (ia3d). It consists of a β-MnO2 crystalline phase corresponding to pyrolusite, with a rutile structure. Transmission electron microscopy and X-ray photoelectron spectroscopy showed that the 3D-MnO2 catalyst has a large number of exposed Mn4+ ions on the (110) crystal plane surfaces, with a lattice spacing of 0.311 nm; this enhances oxidation of HCHO. Complete conversion of HCHO to CO2 and H2O was achieved at 130 ℃ on 3D-MnO2; the same conversions on α-MnO2 and β-MnO2 nanorods were obtained at 140 and 180 ℃, respectively, under the same conditions. The specific mesoporous structure, high specific surface area, and large number of surface Mn4+ ions are responsible for the catalytic activity of 3D-MnO2 in HCHO oxidation.
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