微波加热制备高性能MFI型沸石膜

Synthesis of High Performance MFI-type Zeolite Membrane with Microwave Heating

以微波加热代替传统加热方式,采用二次生长法在大孔氧化铝载体上制备了高性能的Silicalite-1沸石膜。研究了两种加热方式对所制备的沸石膜性能的影响,包括晶体结构、形貌和气体渗透性能。通过XRD、SEM和单组份气体渗透测试对Silicalite-1沸石膜进行表征。结果表明：不同于常规加热方式制备的沸石膜,微波加热制备的沸石膜表面连续、致密、完整;膜层较薄,与载体结合紧密;具有较高的氢气渗透速率（1.7×10^-6mol·m^-2·s^-1·Pa^-1）和选择性（H2/SF6理想分离因数为156）。

High performance MFI-type zeolite membranes were prepared on macroporous tubular α-Al2O3 supports by secondary growth method,in which microwave heating（MH） was used to replace the conventional heating（CH）.The influence of the two heating styles on the propertied of the as-prepared membranes was investigated.XRD,SEM and single-gas permeance tests were used to characterized the Silicalite-1 membranes.The results showed that the MH membrane was covered with small,uniform and well-intergrown crystals.The membrane layer was very thin with good coupling force with the support.Moreover,the MH membrane exhibited relatively high hydrogen permeance and ideal separation factor,which were about 1.7×10^-6 mol·m^-2·s-^1·Pa-1 and 156 for H2/SF6.