Density of He adsorbed in micropores at 4.2K
Density of He adsorbed in micropores at 4.2K
复制标题
4.2K 微孔中 He 吸附密度
DOI：
10.1007/bf00705003
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发表时间：
1995
期刊：
影响因子：
3.3
通讯作者：
K. Kaneko
中科院分区：
文献类型：
--
作者：
N. Setoyama;K. Kaneko
用He吸附法测定了4.2K时Na Y和KL沸石圆柱形微孔中He的吸附密度。在77 K下比较了He和N2的吸附等温线。晶体学的考虑，给出了He吸附层的密度，这是必要的评估的超微孔性的较少结晶的微孔固体，如活性炭。吸附在沸石的圆柱形微孔中的He的测定密度在0.22至0.26 gml-1的范围内，大于吸附在平坦表面上的He的测定密度（0.202 gml-1）。推荐He的密度值在0.20至0.22 gml− 1之间，用于评估狭缝状微孔系统（如活性炭）的超微孔性。
The density of He adsorbed in the cylindrical micropores of zeolites NaY and KL has been determined by He adsorption at 4.2K. He adsorption isotherms were then compared with N2adsorption isotherms at 77K. Crystallographic considerations of the micropore volumes gave the density of the He adsorbed layer, which is necessary for assessment of ultramicroporosity of less-crystalline microporous solids, such as activated carbons. The determined density of He adsorbed in the cylindrical micropores of the zeolite was in the range 0.22 to 0.26 gml−1, greater than that of He adsorbed on a flat surface (0.202 gml−1). A value for the density of He between 0.20 to 0.22 gml−1is recommended for evaluation of ultramicroporosity of a slit-shaped microporous system such as activated carbon.