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beijingliu

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专业: 催化化学

[交流] 【求助】氩气测孔体积，表面积

各位：最近听说氩气做表面吸附比氮气要好一些，打算做一下。大家知道哪里可以做吗？最好能提供联系方式！！谢谢！！！

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1楼 2010-09-19 11:41:45

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fengleba

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beijingliu(金币+1): 2010-09-20 16:57:22

气体的选择和催化剂的孔尺寸有关系吧。具体效果就不清楚。

不知道自己自备氩气钢瓶是否可以。

[ Last edited by fengleba on 2010-9-19 at 21:56 ]

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2楼2010-09-19 21:55:33

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催化大师(金币+2):谢谢指点，欢迎常来催化版讨论！ 2010-09-20 08:34:47
beijingliu(金币+2): 2010-09-20 16:57:29

For a number of reasons, nitrogen (at 77 K) is generally considered to be the most suitable adsorptive for the determination of the surface area of non-porous, macroporous or mesoporous solids.
Since the nitrogen–surface interactions are dependent on the adsorbent structure, some variation in Am is to be expected.
it is not easy to obtain completely independent verification of BET nitrogen areas.
Argon may seem to be an alternative adsorptive for surface area determination.
An alternative is argon adsorption at 87 K, i.e. at liquid argon temperature.
A cross-sectional area, AAr, of 0.142 nm2 is usually assumed.
For operational reasons, it becomes difficult to measure the adsorption of nitrogen if the specific surface area is relatively low (i.e. if As < 2 m2 g-1).
In this event, krypton adsorption at 77 K can be used to minimize the dead space correction and hence improve the accuracy in measuring the small amounts adsorbed.

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3楼2010-09-19 22:32:28

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