α-Al2O3载体上b-轴取向MFI分子筛膜的制备

摘要在α-Al₂O₃支撑的PVA表面手工组装紧密排列的b-轴取向silicalite-1分子筛晶体层，煅烧除去高聚物层后可得到很好的晶种层。采用两步法二次合成工艺，在多孔氧化铝载体表面可直接合成完备的b-轴取向MFI型分子筛膜。n(TEOS)∶n(TPAOH)∶n(H₂O)为1.0∶0.2∶200.0的合成液经150 ℃预加热处理可有效减少二次生长过程中α-轴孪晶的生成，保证制备的MFI膜为很好的b-轴取向。SEM及XRD检测表明所制备膜层的完备性及b-轴取向。另外采用多层取向晶种层经过一次晶化3 h即可制备完备的b-轴取向多层MFI型分子筛膜。实现了在大孔载体上直接合成b-轴取向的MFI膜，对提高膜的应用性能有重要意义。

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	吕晓丽
	刘秀凤

关键词： b-轴取向 MFI分子筛膜两步法二次合成工艺

Abstract： Closely packed b-oriented silicalite-1 were manually assembled on α-Al₂O₃ supported PVA film, which can acted as good seed layer after removal of the PVA layer by calcination. Perfect b-oriented MFI membrane was synthesized by secondtime seeded growth procedure. When preheated the precursor solution which molar ratio was n(TEOS)∶n(TPAOH)∶n(H₂O)=1.0∶0.2∶200.0, the unwanted twingrowth could be effectively inhibited. SEM and XRD detections confirmed that a continuous and crackfree b-oriented MFI film was formed, and zeolite seeds had merged with each other very well. b-oriented multi-layer silicalite-1 crystals were also used as seed layer and continuous membrane was prepared after crystallization for 3 h. The preparation of b-oriented MFI films on macroporous support could greatly improve separation and/or reaction performance.

Keywords： b-oriented MFI membrane second-time seeded growth

Received 2012-05-23;

Fund:

国家自然科学基金(21076154)资助项目。

Corresponding Authors: 刘秀凤，电话：13820837768, E-mail: xfliu@tju.edu.cn。 Email: xfliu@tju.edu.cn

引用本文:

吕晓丽, 刘秀凤.α-Al₂O₃载体上b-轴取向MFI分子筛膜的制备[J]. 化学工业与工程, 2013,30(2): 31-35

LYU Xiao-Li , LIU Xiu-Feng.b-Oriented MFI Membrane Prepared on α-Al₂O₃[J]. Chemcial Industry and Engineering, 2013,30(2): 31-35