钯因其独特的加氢特性而被广泛用作氢同位素分离过程中的分离材料。为了减少Pd粉化效应并提高气体流速，通常使用Pd-Al 2 O 3（Pd沉积在Al 2 O 3上）作为分离材料。掌握Pd-Al 2 O 3材料吸放氢热力学及动力学同位素效应至关重要，有利于提高分离效率。在这项工作中，新鲜Pd-Al 2 O 3中存在的PdO对Pd-Al热力学特性研究了2 O 3 –H(D)体系和多孔基质对Pd-Al 2 O 3吸氢动力学的影响。结果表明，初次吸氢-脱附后，PdO完全还原为Pd，导致吸氢能力下降。然而，它对Pd-Al 2 O 3 -H (D)体系的焓和熵值没有影响。Pd-Al 2 O 3的氢吸附动力学分析表明，Pd-Al 2 O 3的氢吸附可以通过JMAK模型的特例Mample模型进行拟合，并推导出接口控制模型。多孔基质影响Pd-Al 2 O 3的氢吸附速率。SEM和XRD结果表明，经过60次吸氢-脱附循环后，Pd-Al 2 O 3颗粒的表面发生了轻微变化，粉化率为3.3 wt%，尽管高强度氧化铝载体可以承受由此产生的应力。氢吸收过程中 Pd 膨胀。

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Palladium has been widely served as the separation material in the hydrogen isotope separation process on account of its unique hydrogenation characteristics. To reduce Pd pulverization effect and improve the gas flow rate, Pd–Al2O3 (Pd deposited on Al2O3) is commonly used as the separation material. It is crucial to grasp the hydrogen absorption and desorption thermodynamics and kinetic isotope effect of Pd–Al2O3 material, which favours raising the separation efficiency. In this work, the effect of PdO existing in the fresh Pd–Al2O3 on the thermodynamic character of Pd–Al2O3–H(D) system and the porous substrate effect on the hydrogen absorption kinetics of Pd–Al2O3 were investigated. It shows that PdO could totally reduce to Pd after primary hydrogen adsorption-desorption, leading to decreased hydrogen absorption capacity. However, it has no effect on the enthalpy and entropy values of Pd–Al2O3–H (D) system. The kinetic analysis of hydrogen adsorption of Pd–Al2O3 shows that the hydrogen absorption of Pd–Al2O3 could be fitted by Mample model, a special case of the JMAK model, and the interface-controlled model can be deduced. The porous substrate influences the rate of hydrogen adsorption of Pd–Al2O3. The SEM and XRD results show that after 60 hydrogen absorption-desorption cycles, the surface of Pd–Al2O3 pellet has a slight change with a pulverization rate of 3.3 wt%, although the high-strength alumina support can withstand the stress caused by Pd expansion during hydrogen absorption.