通过非晶态介孔锰氧化物的温和转变制备的晶态介孔K(2-x)Mn₈O₁₆和ε-MnO₂及其增强的氧化还原性能。
Crystalline mesoporous K(2-x)Mn₈O₁₆ and ε-MnO₂ by mild transformations of amorphous mesoporous manganese oxides and their enhanced redox properties.
作者信息
Poyraz Altug S, Song Wenqiao, Kriz David, Kuo Chung-Hao, Seraji Mohammad S, Suib Steven L
机构信息
Department of Chemistry and ‡Department of Chemistry Institute of Materials Science, University of Connecticut , U-3060, 55 North Eagleville Road, Storrs, Connecticut 06269, United States.
出版信息
ACS Appl Mater Interfaces. 2014 Jul 23;6(14):10986-91. doi: 10.1021/am502846e. Epub 2014 Jul 1.
Synthesis of crystalline mesoporous K(2-x)Mn8O16 (Meso-OMS-2), and ε-MnO2 (Meso-ε-MnO2) is reported. The synthesis is based on the transformation of amorphous mesoporous manganese oxide (Meso-Mn-A) under mild conditions: aqueous acidic solutions (0.5 M H(+) and 0.5 M K(+)), at low temperatures (70 °C), and short times (2 h). Meso-OMS-2 and Meso-ε-MnO2 maintain regular mesoporosity (4.8-5.6 nm) and high surface areas (as high as 277 m(2)/g). The synthesized mesoporous manganese oxides demonstrated enhanced redox (H2-TPR) and catalytic performances (CO oxidation) compared to nonporous analogues. The order of reducibility and enhanced catalytic performance of the samples is Commercial-Mn2O3 < nonporous-OMS-2 < Meso-Mn2O3 < Meso-OMS-2 < Meso-ε-MnO2 < Meso-Mn-A.
报道了晶态介孔K(2 - x)Mn8O16（介孔OMS - 2）和ε - MnO2（介孔ε - MnO2）的合成。该合成基于非晶态介孔锰氧化物（介孔 - Mn - A）在温和条件下的转化：在酸性水溶液（0.5 M H(+)和0.5 M K(+)）中，于低温（70 °C）和短时间（2小时）下进行。介孔OMS - 2和介孔ε - MnO2保持规则的介孔率（4.8 - 5.6 nm）和高比表面积（高达277 m(2)/g）。与无孔类似物相比，合成的介孔锰氧化物表现出增强的氧化还原（H2 - TPR）和催化性能（CO氧化）。样品的还原顺序和增强的催化性能顺序为：商业 - Mn2O3 < 无孔 - OMS - 2 < 介孔 - Mn2O3 < 介孔 - OMS - 2 < 介孔 - ε - MnO2 < 介孔 - Mn - A。
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