Stability of pore-plated membranes for hydrogen production in fluidized-bed membrane reactors
Stability of pore-plated membranes for hydrogen production in fluidized-bed membrane reactors
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DOI：
10.1016/j.ijhydene.2019.04.285
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发表时间：
2020-03
影响因子：
7.2
通讯作者：
E. Tosto;D. Alique;D. Martinez-Diaz;R. Sanz;J. A. Calles;A. Caravella;J. Medrano;F. Gallucci
中科院分区：
文献类型：
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作者：
E. Tosto;D. Alique;D. Martinez-Diaz;R. Sanz;J. A. Calles;A. Caravella;J. Medrano;F. Gallucci
首次在流化条件下研究了通过镀孔技术制备的钯基膜。在氧化多孔不锈钢载体上实现了约 20 μm 的钯厚度。膜的稳定性已在气体分离模式（无催化剂）下评估了超过 1300 小时，并在连续流化条件下额外评估了 200 小时。对于 375 至 500 °C 的温度范围，获得了 5·10−7mol s−1m−2Pa−1 量级的渗透率。在流化过程中，由于外部（床到壁）传质阻力增加，观察到渗透性略有下降。此外，水煤气变换（WGS）反应案例已在流化床膜反应器中进行。已经证实，通过膜的选择性 H2 分离导致 CO 转化超出（传统系统的）热力学平衡，这显示了膜反应器在化学转化中的优势。
Pd-based membranes prepared by pore-plating technique have been investigated for the first time under fluidization conditions. A palladium thickness around 20 μm was achieved onto an oxidized porous stainless steel support. The stability of the membranes has been assessed for more than 1300 h in gas separation mode (no catalyst) and other additional 200 h to continuous fluidization conditions. Permeances in the order of 5·10−7mol s−1m−2Pa−1have been obtained for temperatures in a range between 375 and 500 °C. During fluidization, a small decrease in permeance is observed, as consequence of the increased external (bed-to-wall) mass transfer resistances. Moreover, water gas shift (WGS) reaction cases have been carried out in a fluidized bed membrane reactor. It has been confirmed that the selective H2separation through the membranes resulted in CO conversions beyond the thermodynamic equilibrium (of conventional systems), showing the benefits of membrane reactors in chemical conversions.