The adsorption characteristics of helium under low temperature

IF 1.8 3区工程技术 Q3 PHYSICS, APPLIED

Cryogenics Pub Date : 2024-05-26 DOI:10.1016/j.cryogenics.2024.103862

Niannian Dai , Peng Jia , Qianxi Qu , Huan Chen , Liguo Wang , Yaran Shi , Rendong Guo , Dong Xu , Laifeng Li

引用次数: 0

Abstract

To study the separation of helium isotopes by cryogenic adsorption, figuring out the adsorption characteristics of helium isotopes at low temperature is necessary. In this paper, a cryogenic adsorption measurement device has been established. It consists of a cryostat with a GM Cryocooler as cold source, a Setaram gas sorption instrument and a temperature controller. The helium-4 adsorption isotherms were studied under different temperatures and pressures (15–300 K, 0–1.5 MPa) by volumetric method. The results showed that a little helium was adsorbed by activated carbon at 300 K and 77 K. The amount of adsorbed helium increased with the temperature decreased from 20 K to 15 K. At pressures lower than 0.2 bar, the adsorption capacity increased rapidly as the pressure increased. Besides, the isosteric heats of adsorption were obtained, which was around 515 J/mol and changed little. Moreover, the cryogenic adsorption results were analyzed by Langmuir model and Toth model.

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低温条件下氦的吸附特性

要研究低温吸附分离氦同位素，就必须弄清氦同位素在低温下的吸附特性。本文建立了一个低温吸附测量装置。它由一个以 GM Cryocooler 为冷源的低温恒温器、一个 Setaram 气体吸附仪和一个温度控制器组成。在不同温度和压力（15-300 K，0-1.5 MPa）下，采用体积法研究了氦-4 吸附等温线。结果表明，在 300 K 和 77 K 条件下，活性炭能吸附少量氦气；随着温度从 20 K 降至 15 K，氦气的吸附量增加。此外，还得到了等效吸附热，吸附热约为 515 J/mol，且变化不大。此外，还利用 Langmuir 模型和 Toth 模型对低温吸附结果进行了分析。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cryogenics 物理-热力学

CiteScore

3.80

自引率

9.50%

发文量

审稿时长

2.1 months

期刊介绍： Cryogenics is the world''s leading journal focusing on all aspects of cryoengineering and cryogenics. Papers published in Cryogenics cover a wide variety of subjects in low temperature engineering and research. Among the areas covered are: - Applications of superconductivity: magnets, electronics, devices - Superconductors and their properties - Properties of materials: metals, alloys, composites, polymers, insulations - New applications of cryogenic technology to processes, devices, machinery - Refrigeration and liquefaction technology - Thermodynamics - Fluid properties and fluid mechanics - Heat transfer - Thermometry and measurement science - Cryogenics in medicine - Cryoelectronics