变温喷涂涂晶法在大孔载体上合成NaA沸石膜
作者:许静,李华征,杨建华,王金渠,孟祥娣,许波,殷德宏,鲁金明,张艳
单位: 大连理工大学精细化工国家重点实验室吸附与无机膜研究所
关键词: 喷涂晶种法;NaA沸石膜;大孔载体;渗透汽化;有机物脱水
分类号: TQ028.8
出版年,卷(期):页码: 2013,33(6):20-24

摘要:
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.

基金项目:
自然科学基金(No.21076029);新世纪优秀人才(NCET-10-0286)

作者简介:
许静(1986-),女,山东聊城人,硕士研究生,从事无机膜的制备及有机物脱水研究.*通讯联系人,E-mail:yjianhua@dlut.edu.cn (杨建华);wjinqu@dlut.edu.cn (王金渠)

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