Abstract

The Henry constants upon the adsorption of inert gases with a natural isotopic composition (argon, krypton, and xenon) on activated carbon of the AG-3, VSK-5, SKT-3, and NWC 12x40 brands in a temperature range of 15–80°C are determined. A positive correlation of the Henry constants with the specific surface and micropore volume and surface normalized to the unit volume of the solid phase is found. The parameters of the temperature dependence of the Henry constants are determined, and the isosteric heats of adsorption of inert gases are calculated. The experimental results are used for calculating the steady-state mode of operation of the radiochromatographic column of the radioactive-gas purification system of nuclear power plants. It is shown that, out of all the studied brands, the highest decontamination factors of the air flow from inert radioactive gases are provided by coconut shell carbons of the VSK-5 and NWC 12x40 brands, which are noticeably superior to the peat carbon activated with sulfuric acid and potassium hydroxide of the SKT-3 brand (currently applied at most Russian NPPs) with respect to this indicator. Carbon of the AG-3 does not make it possible to reach the required degree of purification.

中文翻译：

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不同品牌活性炭在静态条件下对氩、氪和氙的吸附能力与天然同位素组成的比较

摘要

具有天然同位素组成（氩、氪和氙）的惰性气体在 AG-3、VSK-5、SKT-3 和 NWC 12x40 品牌的活性炭上吸附时的亨利常数，温度范围为 15–确定为 80°C。发现亨利常数与比表面积和微孔体积以及归一化为固相单位体积的表面呈正相关。确定了亨利常数的温度依赖性参数，并计算了惰性气体的等量吸附热。实验结果用于计算核电厂放射性气体净化系统放射色谱柱的稳态运行模式。结果表明，在所有研究的品牌中，VSK-5 和 NWC 12x40 品牌的椰壳碳提供了惰性放射性气体气流的最高净化因子，它们明显优于 SKT-3 品牌的用硫酸和氢氧化钾活化的泥炭碳（目前适用于大多数俄罗斯核电厂）关于该指标。AG-3 的碳无法达到所需的净化程度。