Characteristics of Helium Adsorption on Microporous Solids under Cryogenic Conditions

Characteristics of Helium Adsorption on Microporous Solids under Cryogenic Conditions
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低温条件下微孔固体上氦的吸附特性

DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
M. Hasatani
M. Hasatani
中科院分区：
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文献类型：
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作者：
M. Kumita;Junya Ozaki;Jun Kobayashi;M. Ito;Fujio Watanabe;M. Hasatani

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提出了一种新的氦吸附容量法制备具有清晰孔结构的微孔固体。在氦的沸点附近测定了氦在硅铝、活性炭和沸石上的吸附平衡。将得到的氦吸附等温线与氮吸附等温线进行了比较。其结果是，所使用的所有吸附剂上吸附的氦的量远大于在低相对压力区域中吸附的氮的量，这表明氦是一种有用的分子，以调查这些材料的微孔结构。因此，提出了该方法应用于纳米晶表征的可能性。B.E.T.的结果比表面积也支持这一结论。
A new volumetric method using helium adsorption was proposed to make microporous solids with clear pore structures. Adsorption equilibria of helium on silica-alumina, activated carbon and zeolites were measured at a temperature around its boiling point. The helium adsorption isotherms obtained were compared with the nitrogen adsorption isotherms. As a result, the amounts of helium adsorbed on all adsorbents used were much greater than those of nitrogen adsorbed in the low relative pressure region, indicating that helium is a useful molecule to investigate microporous structures of such materials. Therefore, the possibility that this method be applied to micropore characterization was suggested. The results of B.E.T. specific surface areas also support this conclusion.