Considering the reliable characteristics and the suitable silica alumina content of kaolin, a new way of synthesizing a ZSM-5/NaA hybrid zeolite membrane on 170 mm length ceramic tubes by employing kaolin as a modification layer using a hydrothermal synthesis process was presented for the first time in this work. Kaolin was filtrated on the surface of the support (not only the ceramic tube, but also the NaA membrane layer) as a modification layer not only promoting the interface interlinkage among the support, NaA membrane and ZSM-5 membrane layer, but also promoting the growth of zeolite membranes. The SEM and XRD results showed that compact and homogeneous NaA and ZSM-5 zeolite layers were both formed with the thicknesses being 7.06 μm and 6.14 μm, respectively, after modification with kaolin. The permeation separation experiments demonstrated that the performance of the ZSM-5/NaA hybrid membrane was better than that of the monolayer zeolite membrane with permselectivities of H₂ over CO₂, N₂, CO and CH₄ of 5.40, 4.65, 4.70 and 3.93, respectively, which were higher than the corresponding Knudsen diffusion coefficients. Above all, modifying the support with kaolin and then synthesizing the ZSM-5/NaA hybrid membrane could strengthen the performance of the zeolite membrane effectively, which provided a new approach for the synthesis of high performance zeolite membranes in the field of membrane separation.

中文翻译：

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以高岭土为改性层的ZSM-5 / NaA杂化沸石膜的合成

考虑到高岭土的可靠特性和合适的二氧化硅氧化铝含量，提出了一种新的方法，该方法通过水热合成工艺，以高岭土为改性层，在长度为170 mm的陶瓷管上合成ZSM-5 / NaA杂化沸石膜。在这项工作中的时间。高岭土作为改性层过滤在载体表面上（不仅是陶瓷管，而且是NaA膜层），不仅促进了载体，NaA膜和ZSM-5膜层之间的界面相互连接，而且促进了沸石膜的生长。SEM和XRD结果表明，经高岭土改性后，形成了致密均匀的NaA和ZSM-5沸石层，厚度分别为7.06μm和6.14μm。₂在CO ₂，N ₂，CO和CH ₄的5.40，4.65，4.70分别与3.93，其比相应的努森扩散系数更高。最重要的是，用高岭土改性载体，然后合成ZSM-5 / NaA杂化膜可以有效地增强沸石膜的性能，这为膜分离领域合成高性能沸石膜提供了新的途径。