| 原位法合成有取向无过渡区域的MFI分子筛膜 |
| Oriented Growth of MFI Zeolite Membrane without Transition Zone by In-situ Method |
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| 摘要: 采用原位法在多孔α-Al2O3载体表面合成出连续覆盖且b轴取向的MFI分子筛晶种层，进一步在较温和的条件下进行二次生长，获得了b、a-轴取向的膜层，厚度约为3 μm。通过控制合成液的nH2O/ nSi比值，可以调节凝胶粒径大小，使其无法渗透到载体孔内，可以避免膜层与载体之间过渡区域的形成。与国内外现有合成方法比较，采用原位水热法合成晶种层并进一步进行二次生长得到分子筛膜的合成路线简单、易行，同样可以达到控制分子筛膜层晶体取向和微观结构的目的。 |
| 关键词: 分子筛膜 原位法 二次生长 晶体取向 |
| 基金项目: |
| Abstract: Full coverage and b-oriented seeded layers were produced on porous α-Al2O3 supports by in-situ nucleation. The formation of b and a-oriented membrane with thickness of 3 μm could be ensured by the further secondary growth in a relatively mild condition. The permeation of gel particles into the pores could be prevented by adjusting the ratio of nH2O/ nSi, hence the transition zone between the membrane and the porous support could be avoided. Compared with the state-of-the-art synthesis routes of zeolite membranes, the method based on in-situ nucleation and secondary growth is simpler and more practicable, by which the control and optimization of membrane orientation and microstructure can be achieved. |
| Keywords: zeolite membrane in-situ method secondary growth crystal orientation |
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| 周明,张宝泉,刘秀凤.原位法合成有取向无过渡区域的MFI分子筛膜[J].无机化学学报,2006,22(10):1750-1754. |
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