Novel silica-based adsorbents with activated carbon structure
Novel silica-based adsorbents with activated carbon structure
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DOI：
10.1016/j.micromeso.2015.02.007
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发表时间：
2015-07-01
影响因子：
5.2
通讯作者：
Atakan, Burak
中科院分区：
文献类型：
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作者：
Curdts, Benjamin;Pflitsch, Christian;Atakan, Burak
介绍了四甲基硅烷（TMS）化学气相渗透活性炭制备二氧化硅吸附剂的方法。该方法基于两步流程。在第一步中，活性炭在943 K下在200毫巴的氮- tms蒸气气氛中渗透。在这些条件下，碳骨架被硅覆盖。所得到的材料是高度多孔的，并且很好地适应了碳模板的表面结构。它在室温下与空气接触时已部分氧化。在第二步中，渗透的碳在853 K的空气中完全氧化。在这些条件下，支撑碳骨架完全燃烧，硅变成氧化硅。所得材料具有高度多孔性，表面积非常大，约为835 m(2)/g。总的来说，这种新型材料似乎很好地适应了活性炭的宏观和微观结构。(c) 2015年作者。Elsevier Inc.出版。
The preparation of silica adsorbances from chemical vapor infiltration of activated carbon with tetramethylsilane (TMS) is shown. The method bases on a two step process. In a first step, activated carbons are infiltrated at 943 K in a nitrogen-TMS-vapor atmosphere of 200 mbar. At these conditions, the carbon skeleton is covered with silicon. The resulting material is highly porous and well adapting the surface structure of the carbon templates. It is already partly oxidized at room temperature when coming into contact with air. In a second step, the infiltrated carbons are completely oxidized in air at 853 K. At these conditions, the supporting carbon skeleton is completely burned and the silicon becomes silicon oxide. The resulting materials are highly porous with extremely large surface areas around 835 m(2)/g. Overall, the novel material seems to well adapt the original macro- and microstructure of the activated carbon used. (c) 2015 The Authors. Published by Elsevier Inc.