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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Absorption isotherms for H_2(D_2)-Pd_(0.8)Ag_(0.2) (198-323 K)
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Absorption isotherms for H_2(D_2)-Pd_(0.8)Ag_(0.2) (198-323 K)

机译：H_2（D_2）-Pd_（0.8）Ag_（0.2）（198-323 K）的吸收等温线

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摘要

Isotherms for H_2/D_2-Pd_(0.8)Ag_(0.2) systems have been measured over a low temperature range, 198-323 K. Such low temperature data for this system have not been obtained previously. The absorption kinetics was found to be fast. The isotherms at low temperatures are compared with literature values at or above 313 K, as well as those for H_2(D_2)-Pd systems. The H/D isotope effect and the separation factors in the plateau range over Pd_(0.8)Ag_(0.2) are calculated at various temperatures and discussed, based on the isotherms. Enthalpies are extracted from van't Hoff plots and compared with calorimetric values and the results from the literature for both absorption and desorption processes. A method is given for using isotherm information from single isotope systems to estimate the separation factor for the mixed isotope systems and this is a helpful tool. The challenge of measuring absorption isotherms at low temperatures and low pressures is discussed. Sample pre-treatment, non-soluble impurity accumulation in an absorption process and thermal transpiration effects are examined.
机译：H_2 / D_2-Pd_（0.8）Ag_（0.2）系统的等温线已在198-323 K的低温范围内进行了测量。该系统的此类低温数据以前尚未获得。发现吸收动力学很快。将低温下的等温线与313 K或更高的文献值以及H_2（D_2）-Pd系统的等温线进行比较。在等温线下，计算并讨论了Pd_（0.8）Ag_（0.2）范围内H / D同位素效应和平台范围上的分离因子。从van't Hoff图中提取焓，并将其与量热值以及来自吸收和解吸过程的文献结果进行比较。给出了一种使用来自单个同位素系统的等温线信息来估计混合同位素系统的分离因子的方法，这是一个有用的工具。讨论了在低温和低压下测量吸收等温线的挑战。检查样品的预处理，吸收过程中非可溶性杂质的积累和热蒸发效应。

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