In future fusion power plants, the tritium (T) breeding inside the reactor is a key aspect to ensure the so-called tritium self-sufficiency. The continuous availability of the fuel for further fusion reactions requires the continuous separation of small molecules such as hydrogen isotopologues (e.g., HT) from helium. Pressure-driven separation with membranes is a promising method to fulfill these requirements, especially if molecular-sieving membranes are available to separate these gas species. In this work, the single gas permeances of He, H₂ and D₂ were measured with a MFI-ZSM-5 zeolite-type tubular membrane. These experiments were performed in the membrane’s temperature range: $298–398\text{K}$. At these temperatures, a transition in the transport regime was observed at $360\text{K}$, which is attributed to the transition from surface-diffusion dominant to gas-translational diffusion dominant. Using the measured permeances, the permselectivities for H₂/He and D₂/He were calculated. In the temperature range tested, the permselectivities exceed the Knudsen selectivity, indicating that the membrane is of rather high-quality. Instead, the H₂/D₂ permeances ratio was around the Knudsen ratio (i.e., $\sim 1.41$). Moreover, the permeances of the binary mixture H₂/D₂, at the whole concentration range, were also measured at $298\text{K}$ to study the isotopic effects on the transport through the MFI-ZSM-5 membrane. We found that the mixed gas behaves macroscopically as a hydrogen isotopologue molecule, and its permeance falls with $M_{\text{eff}}^{-0.5}$, where $M_{\text{eff}}$ is the effective mass of the mixture determined by the concentrations of H₂ and D₂. Using this result, the Q₂ permeances and the Q₂/He permselectivities (where Q = H, D, T) for the other hydrogen isotopologues (i.e., HD, HT, DT and T₂) were also calculated.

在未来的聚变电厂中，反应堆内部的tri（T）繁殖是确保所谓的self自给自足的关键方面。燃料的持续可用性可用于进一步的聚变反应，需要从氦气中连续分离出小分子，例如氢同位素分子（例如HT）。用膜进行压力驱动的分离是满足这些要求的一种有前途的方法，尤其是在分子筛膜可分离这些气体种类的情况下尤其如此。在这项工作中，用MFI-ZSM-5沸石型管状膜测量了He，H ₂和D ₂的单气体渗透率。这些实验是在膜的温度范围内进行的：$298–398\text{ķ}$。在这些温度下，在$360\text{ķ}$，这归因于从表面扩散为主向气体平移扩散为主的过渡。使用测得的磁导率，计算出H ₂ / He和D ₂ / He的磁导率。在测试的温度范围内，渗透选择性超过了Knudsen选择性，表明该膜具有较高的品质。取而代之的是，H ₂ / D ₂渗透率比在Knudsen比附近（即，$〜1.41$）。此外，还在整个浓度范围内测量了二元混合物H ₂ / D ₂的磁导率。$298\text{ķ}$研究同位素对通过MFI-ZSM-5膜运输的影响。我们发现混合气体在宏观上表现为氢同位素分子，其渗透率随${\mathrm{中号}}_{\text{效}}^{--0.5}$， 在哪里 ${\mathrm{中号}}_{\text{效}}$是由H ₂和D ₂的浓度决定的混合物的有效质量。使用该结果，还计算了其他氢同位素异构体（即HD，HT，DT和T ₂）的Q ₂磁导率和Q ₂ / He磁导率（其中Q = H，D，T）。