High performance stainless-steel supported Pd membranes with a finger-like and gap structure and its application in NH3 decomposition membrane reactor
High performance stainless-steel supported Pd membranes with a finger-like and gap structure and its application in NH3 decomposition membrane reactor
复制标题
高性能不锈钢负载指状间隙结构Pd膜及其在NH3分解膜反应器中的应用
DOI：
10.1016/j.cej.2020.124245
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发表时间：
2020-05-15
影响因子：
15.1
通讯作者：
Chen, Ping
中科院分区：
文献类型：
--
作者：
Liu, Jinxia;Ju, Xiaohua;Chen, Ping
钯复合膜在几个重要的领域显示出巨大的潜力，例如燃料电池的H-2生产或燃烧前应用。本研究提出了一种简单有效的方法，通过在指状多孔不锈钢支架（PSS）表面涂覆MnCO3颗粒，使其在后续热处理过程中形成约1 μ m的小间隙，从而制备出具有指状和间隙结构的高性能不锈钢支撑Pd复合膜。在接近实际的燃料电池应用条件下，这种新结构的稳定性在20-50次快速加热/冷却循环中得到了证明，最大斜坡速率为10 K/min。这种结构模仿半独立式大块Pd膜，既避免了Pd层与PSS的直接接触，保证了高H-2渗透率，又避免了金属膜与组件之间的剪切应力。该膜具有指状间隙结构，应用于NH3分解膜反应器中，在相对较低的温度（673 K）下实现了NH3的几乎完全转化，并在200 h内保持稳定，具有较好的应用前景。
Pd composite membranes show great potential in several important fields, such as H-2 production for fuel cell or pre-combustion applications. This study presents a facile and effective approach to develop high performance stainless-steel supported Pd composite membranes with a finger-like and gap structure by coating the finger-like porous stainless-steel support (PSS) with MnCO3 particles, which forms a small gap of ca. 1 mu m during subsequent thermal treatment. The stability of this novel configuration was demonstrated under 20-50 fast heating up/cooling down cycles at a maximum ramp rate of 10 K/min, under near practical fuel cell application conditions. Such a structure imitates semi-free-standing bulk Pd membranes, which not only avoids the direct contact between Pd layer and PSS and ensures a high H-2 permeance, but also avoids the shear stresses between the metal membrane and module. The membrane with a finger-like and gap structure was applied in NH3 decomposition membrane reactor, which achieved nearly complete NH3 conversion at a relatively low temperature of 673 K and remained stable for 200 h, exhibiting potential in future applications.