Isotope exchange reaction of tritium on precious metal catalyst based on cation-exchanged mordenite for blanket tritium recovery
Isotope exchange reaction of tritium on precious metal catalyst based on cation-exchanged mordenite for blanket tritium recovery
复制标题
基于阳离子交换丝光沸石的贵金属催化剂上氚的同位素交换反应用于全面回收氚
DOI：
10.1016/j.fusengdes.2015.11.009
复制
发表时间：
2016
影响因子：
1.7
通讯作者：
Toshihiko Yamanishi
中科院分区：
文献类型：
--
作者：
Yoshinori Kawamura;Takumi Hayashi;Toshihiko Yamanishi
从陶瓷增殖包层释放的氚的化学形式是氢形式和水形式。为了回收氚化水蒸气，提出采用合成沸石填充柱干燥器。另一方面，合成沸石通常用作贵金属催化剂的载体。这种催化剂通常具有在气体和水蒸气之间进行氢同位素交换的能力。将该催化剂用于干燥器，可获得较好的同位素交换反应回收氚功能。为了评估这些功能，应估计反应率。阳离子交换丝光沸石的水吸附实验结果表明，交换阳离子改变了吸附水的状态。因此，本文制备了以阳离子交换丝光沸石为载体的贵金属催化剂，并采用稳态近似法研究了30 °C ~ 80 °C温度范围内氢与氚水的化学交换反应速率。在铂负载于丝光沸石上的情况下，气态氢与氚化水蒸气之间的反应几乎可以表示为与氚化水蒸气浓度有关的一级反应。
It is known that the chemical forms of tritium released from a ceramic breeder blanket are hydrogen form and water form. To recover tritiated water vapor, adoption of dryer that is packed column of synthetic zeolite has been proposed. On the other hand, synthetic zeolite is often used as a support of precious metal catalyst. Such catalysts usually have a capability of hydrogen isotope exchange between gas and water vapor. If this catalyst is used to dryer, the dryer may obtain a preferable function for tritium recovery by isotopic exchange reaction. To assess such functions, reaction rate should be estimated. The results of water adsorption experiment on cation-exchanged mordenite-type zeolite suggested the possibility that state of adsorbed water varied by exchanged cation. So, in this work, precious metal catalyst based on cation-exchanged mordenite was prepared, and the reaction rate of chemical exchange between hydrogen and tritiated water was investigated under temperature range between 30 °C and 80 °C by the steady-state approximation. In the case of platinum on Na-mordenite, the reaction between gaseous hydrogen and tritiated water vapor was almost expressed as first-order reaction concerning tritiated water vapor concentration.