Investigation of Mechanical, Chemical and Adsorptive Properties of Novel Silicon-Based Adsorbents with Activated Carbon Structure
Investigation of Mechanical, Chemical and Adsorptive Properties of Novel Silicon-Based Adsorbents with Activated Carbon Structure
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DOI：
10.3390/c3030027
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发表时间：
2017-08
期刊：
影响因子：
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通讯作者：
C. Bläker;Stefanie Heib;C. Pasel;B. Atakan;D. Bathen
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文献类型：
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作者：
C. Bläker;Stefanie Heib;C. Pasel;B. Atakan;D. Bathen
在这篇文章中，首次报道了基于碳化硅涂覆活性炭的新型吸附剂的化学和机械性能。以四甲基硅烷（TMS）为前驱体，采用化学气相渗透法（CVI）制备活性炭吸附剂。比较两种不同的改性类型的活性炭，C40/4额外和A35/4额外的，每个渗透与25%的质量在973.15和1098.15 K的渗透温度，分别提出。通过测定气相中的氮吸附等温线和挥发性有机化合物（VOC）吸附等温线以及液相中的过量吸附等温线来表征吸附性能。此外，还测定了其容重、灰分、颗粒硬度、耐磨性、电导率、水溶性成分和pH值等理化性质。此外，在流化床吸附器的第一个实验。结果表明，改性后的吸附剂基本保持了吸附性能。颗粒硬度和耐磨性随着浸渗温度的升高而增加，从而导致机械稳定性的总体增加。没有观察到渗透实验导致的化学稳定性的改变。
In this article, for the first time the chemical and mechanical properties of novel adsorbents based on the coating of activated carbons with silicon carbide are reported. The adsorbents are prepared by chemical vapor infiltration (CVI) of activated carbons with tetramethylsilane (TMS) as a precursor. A comparison of two different modified types of activated carbon, C40/4 Extra and A35/4 Extra, each infiltrated with 25%-mass at infiltration temperatures of 973.15 and 1098.15 K, respectively, is presented. Adsorption properties were characterized by measuring nitrogen isotherms and volatile organic compounds (VOC) isotherms in gas phase and excess isotherms in liquid phase. In addition, the physico-chemical properties including the bulk density, ash content, particle hardness, abrasion, conductivity, water-soluble components, and pH value were determined. Furthermore, the first experiments in a fluidized bed adsorber are presented. The results show that the adsorption properties of the modified adsorbents are mainly maintained. The particle hardness and the abrasion resistance increases with increasing infiltration temperature, which leads to an overall increasing of mechanical stability. A modification of the chemical stability as a result of the infiltration experiments is not observed.