吸附
热液循环
分解
水蒸气
苯
化学
化学工程
金属有机骨架
工作(物理)
水蒸汽压
环境化学
有机化学
热力学
物理
工程类
作者
Nadeen Al‐Janabi,Vladimir Martis,Nektaria Servi,Flor R. Siperstein,Xiaolei Fan
标识
DOI:10.1016/j.cej.2017.09.197
摘要
Metal organic frameworks (MOFs) based adsorption processes for gas separation from humid streams are limited by the hydrothermal stability of MOFs. This work presents a comprehensive study of the hydrothermal stability of CuBTC (BTC = benzene-1,3,5-tricarboxylate) MOF when exposed to humid streams in cyclic operations. We show that water uptake is slow, and that adsorption processes will most likely operate under non-equilibrium conditions. CuBTC does not show signs of decomposition when exposed to low water concentration and room temperature (up to water partial pressures of 6 mbar and 25 °C) for up to 48 h of cyclic operation. Nevertheless, short cycles (of less than 15 min per pressure stage) are required when exposed to high water vapour content (up to 70 mbar, 50 °C). This work demonstrates the need of tailoring the length of water exposure to avoid the equilibrium adsorption of water vapour on CuBTC and maintain the adsorbent integrity.
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