UiO-66膜的制备及对正异丁烷的分离

Fabrication of UiO-66 Membranes for the Separation of n-butane/i-butane

摘要:

采用擦涂法在Al2O3支撑体上引入ZrO2层，利用晶种二次生长法在ZrO2层上成功制备了UiO-66膜。通过XRD和SEM测试手段对晶种和膜的结构和形貌进行了表征。在温度为298 K，压力为0.08 MPa下，测试气体分子的渗透性能检测了UiO-66膜的完整性。考察压力和温度对i-C4H10和n-C4H10两种气体在UiO-66膜上的渗透速率的影响，研究了UiO-66膜对i-C4H10和n-C4H10两种气体的渗透选择性能。结果表明，采用多次擦涂法引入ZrO2层后，获得了覆盖度高且膜层厚度均匀的UiO-66膜，膜厚度为5 μm。UiO-66膜对i-C4H10和n-C4H10两种气体具有反向渗透性能，在操作压力为0.08 MPa，温度为298 K时，UiO-66膜对i-C4H10/n-C4H10两种气体的理想渗透选择性达3.60。渗透速率分别为4.39?10-7 mol/(m2?s?Pa)和1.22?10-7 mol/(m2?s?Pa)。

Abstract:

Continuous UiO-66 membrane was fabricated on alumina support by pre-coating ZrO2 layer and seeding secondary growth. The structure and morphology of membrane were characterized by XRD and SEM. The membrane integrity was examined by testing the permeance of gas under T=298 K and P=0.08 MPa. The effects of operating pressure and operating temperature on the permeation selectivity of UiO-66 membranes were investigated. As a result, pre-coating ZrO2 layer helped to obtain a continuous uniform UiO-66 membrane of about 5 μm in thickness. Reverse permeation properties were found of i-C4H10 and n-C4H10 on UiO-66 membrane. At 25 ?C and 0.08 MPa, the permeation selectivity of the membrane for i-C4H10/n-C4H10 were 3.60, with the corresponding permeance of 4.39?10-7 mol/(m2?s?Pa) and 1.22?10-7 mol/(m2?s?Pa).