A highly permeable hollow fibre substrate for Pd/Al2O3 composite membranes in hydrogen permeation
A highly permeable hollow fibre substrate for Pd/Al2O3 composite membranes in hydrogen permeation
复制标题
DOI：
10.1016/j.ijhydene.2015.01.021
复制
发表时间：
2015-03
影响因子：
7.2
通讯作者：
A. Gil;M. Reis;D. Chadwick;Zhentao Wu;Kang Li
中科院分区：
文献类型：
--
作者：
A. Gil;M. Reis;D. Chadwick;Zhentao Wu;Kang Li
在这项研究中，一个高渗透性的陶瓷中空纤维基板已被制造用于开发钯复合膜。该基底由一个用于通过化学镀沉积Pd膜的薄的海绵状外层和多个用于降低气体渗透阻力的自组织微通道组成。在海绵状层的外表面上形成了一层致密的无缺陷的Pd膜，厚度约为1 μm，表明基底具有很好的均匀性。结果，在450 °C和165 KPa下可以实现0.87 mol s-1 m-2的氢渗透通量。还研究了在不同温度（1300和1400 °C）下烧结的具有不同Pd厚度（1.0和3.3 μm）和不同基底的几种复合膜的氢渗透。结果发现，一个中间层，这是通常形成的，由于在化学镀过程中的Pd渗透，显示出氢渗透的不利影响，特别是当Pd膜非常薄。
In this study, a highly permeable ceramic hollow fibre substrate has been fabricated for developing Pd composite membranes. The substrate consists of one thin outer sponge-like layer for depositing Pd membranes by electroless plating and a plurality of self-organized micro-channels for reducing gas permeation resistance. A dense defect-free Pd membrane with approximately 1 μm was formed on the outer surface of the sponge-like layer, which suggests a great uniformity of the substrate. As a result, a hydrogen permeation flux of 0.87 mol s−1m−2can be achieved at 450 °C and 165 KPa. Hydrogen permeation of the several composite membranes with different Pd thicknesses (1.0 and 3.3 μm) and different substrates sintered at different temperatures (1300 and 1400 °C) was also investigated. It was found that an intermediate layer, which is normally formed due to the Pd penetration during the electroless plating, shows an adverse effect in hydrogen permeation, especially when the Pd membrane is very thin.