本文选用两步变温喷涂晶种法在大孔α-Al2O3管状载体上合成高性能的NaA沸石膜。首先，在448 K下喷涂大晶种(2μm)，对载体表面的大孔进行初步修饰；然后在此基础上在353 K喷涂小晶种(0.4μm)，从而形成一层薄而致密的晶种层；最后在353 K水热合成NaA沸石膜。采用SEM和XRD等表征手段对制备的NaA沸石膜进行表征，并进行渗透汽化测试。测试表明：在348 K下分离90 wt.%乙醇/10 wt.%水溶液，通量达到2.71 kg•m-2•h-1，分离因数>2000。

 Spraying seeding technology was developed to prepare zeolite NaA membranes on the low-cost macroporous α-Al2O3 support. The supports were firstlydepositedby spraying the large (2 μm)NaA crystals at 448 K, and then the small (0.4 μm)NaAseeds were sprayed on the pre-treated supports toobtain a thin and continuous seeds layer. At last, the NaA zeolite membrane was fabricated by the seeded secondary growth at 353 K. The as-synthesized NaA zeolite membrane was characterized by SEM, XRD and pervaporation measurement. The results show that wellinter-grown zeolite NaA membranes were formed. The total flux of the zeolite NaAmembraneswas2.71 kg•m-2•h-1, and the separation factor was more than 2000 in dehydrating the 90wt.%ethanol/10 wt.%water solution at 348 K.

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