Realization of ultramicropore characterization of activated charcoal by cryogenic helium adsorption technique

IF 5.6 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Measurement Pub Date : 2025-03-09 DOI:10.1016/j.measurement.2025.117243

Cheng Chen , Zhaoxi Chen , Rui Hu , Qingxi Yang , Sihui Wang , Kexin Lin

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Abstract

In this paper, an effective experimental approach has been developed and tested to measure the adsorption characteristics of activated charcoals within the temperature range of 4.2 K-100 K. The experiment of 4.5 K helium adsorption was conducted on an activated charcoal sample and the data was analyzed by Brunauer-Emmett-Teller (BET), Dubinin-Radushkevich (DR), and Horvath-Kawazoe (HK) methods, yielding the greater BET surface area (

S_{BET}

) and micropore volume (

V_{micro}

) compared to the nitrogen adsorption isotherm at 80 K. The results show that using helium (He) as a probe can better characterize the surface characteristics of activated charcoal than nitrogen (N₂) probe, especially for ultramicropores that cannot be assessed by N₂ molecules. Consequently, we suggest the He adsorption method as a tool with great promise for reliable and detailed characterization of micropore characteristic parameters about activated charcoals. These results will be utilized to determine the adsorption performance of the adsorbent in cryosorption pumps.

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低温氦吸附技术实现活性炭的超微孔表征

本文开发并测试了一种有效的实验方法来测量活性炭在4.2 K-100 K温度范围内的吸附特性。采用brunauer - emmet - teller （BET）法、Dubinin-Radushkevich （DR）法和Horvath-Kawazoe （HK）法对活性炭样品进行了4.5 K氦吸附实验，得到了比80 K氮气吸附等温线更大的BET比表面积（SBET）和微孔体积（Vmicro）。结果表明，用氦（He）作为探针比用氮（N2）探针能更好地表征活性炭的表面特性，特别是对于无法用N2分子评价的超微孔。因此，我们建议He吸附法作为一种非常有希望可靠而详细地表征活性炭微孔特征参数的工具。这些结果将用于确定吸附剂在低温吸附泵中的吸附性能。

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来源期刊

Measurement 工程技术-工程：综合

CiteScore

10.20

自引率

12.50%

发文量

1589

审稿时长

12.1 months

期刊介绍： Contributions are invited on novel achievements in all fields of measurement and instrumentation science and technology. Authors are encouraged to submit novel material, whose ultimate goal is an advancement in the state of the art of: measurement and metrology fundamentals, sensors, measurement instruments, measurement and estimation techniques, measurement data processing and fusion algorithms, evaluation procedures and methodologies for plants and industrial processes, performance analysis of systems, processes and algorithms, mathematical models for measurement-oriented purposes, distributed measurement systems in a connected world.