| 无模板剂二次生长法制备取向MFI型分子筛膜 |
| Synthesis of Oriented MFI Zeolite Films by Template-free Secondary Growth |
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| 摘要: 使用旋涂法在多孔α-Al2O3载体上获得了b-&h0h-取向的silicalite-1晶种层。在无模板剂存在条件下进行二次生长，通过改变合成液的碱度(OH-/Si)、水量(H2O/Si)和晶化温度等，调节膜表面的形貌和晶体取向。SEM和XRD检测结果表明，对于1SiO2:4EtOH∶xNaOH∶yH2O合成体系，x与y值的选取与分子筛膜的形貌和晶体取向紧密相关。当x=0.56时，增加y值将促进分子筛膜从随机取向到b-轴取向的转变，晶粒形貌也发生了较大变化；当y=270时，可以得到厚约为4 μm、连续且择优b-轴取向的MFI型分子筛膜。 |
| 关键词: 分子筛膜 二次生长 无模板剂 澄清液 晶体取向 |
| 基金项目: |
| Abstract: The seed layer oriented in b-&h0h-axes was covered on the porous α-Al2O3 substrate using a spin coater. In the absence of organic templates, the morphology and orientation of the zeolite film over the seed layer could be regulated by changing the ratios of OH-/Si and H2O/Si, and the reaction temperature. As far as the synthesis system of 1SiO2∶4EtOH∶xNaOH∶yH2O is concerned, the SEM and XRD measurements revealed that the morphology and orientation of zeolite films were closely related to the values of both x and y. When x=0.56, the orientation of the zeolite film would be changed from random to b-axis by increasing y, which was accompanied by substantial morphology change. When y=270, the continuous and preferentially b-oriented MFI zeolite film of ca. 4 μm thick could be obtained. |
| Keywords: zeolite membrane secondary growth template-free clear gel crystal orientation |
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| 刘秀凤,张宝泉,林跃生.无模板剂二次生长法制备取向MFI型分子筛膜[J].无机化学学报,2008,24(10):1679-1683. |
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