负载型聚酰亚胺-ZrO_2杂化膜的制备、表征与应用

Preparation, Characterization and Application of Supported Polyimide-Zirconia Hybrid Membrane

以硅藻土 莫来石陶瓷膜管为支撑体 ,以SiO2 膜为过渡层 ,采用溶胶 凝胶法制备了负载型聚酰亚胺 ZrO2 杂化膜 (PI ZrO2 /SiO2 /K M ) ,并采用TG DTA ,IR ,BET ,SEM ,渗透测定和微反技术对杂化膜进行了表征和测试 .结果表明 ,杂化膜的成膜状况良好 ,厚度约为 1 2 μm ,平均孔径约为 3nm ;杂化膜的N2 渗透通量大于 1 5 μmol/ (m2 ·Pa·s) ,对丙烯 /丙烷的分离因子可达 1 5 .以Pd Cu/MoSiO为催化剂 ,以PI ZrO2 /SiO2 /K M膜管为反应器 ,在 4 0 0℃下CO2 氧化丙烷脱氢制丙烯反应的转化率可达 11 5 % ,丙烯选择性为 95 7% ,明显高于同温度下的常规催化反应 .

Supported PI-ZrO 2 (PIpolyimide) hybrid membrane was prepared by sol-gel method on kieselguhr-mullite (K-M) ceramic membrane substrate with SiO 2 transition layer. The TG-DTA, IR, BET, SEM, gas permeability measurements and micro-reaction technology were employed to study the hybrid membrane. The hybrid membrane was satisfied with well morphology, tightly linked with transition layer. The thickness of hybrid membrane was about 1.2 μm, and the average pore diameter was about 3 nm. The permeation flux of the hybrid membrane for N 2 was more than 1.5 μmol/(m 2·Pa·s), and the separation coefficient for propene/propane was 1.5. Using Pd-Cu/MoSiO as a catalyst and the prepared membrane tube as a reactor, the conversion of propane was 11.5% and the selectivity for propene was 95.7% in the oxidative dehydrogenation of propane with carbon dioxide to propene at 400 ℃, which were relatively higher than the conventional catalytic reactor.