化学学报 ›› 2000, Vol. 58 ›› Issue (11): 1311-1315.    下一篇

研究论文

多孔玻璃载体自转晶B-Al-MFI型沸石膜的原位合成

董维阳;任瑜;龙英才   

  1. 复旦大学化学系.上海(200433)
  • 出版日期:2000-11-15 发布日期:2000-11-15

In-situ synthesis of B-Al-MFI-type zeolite membrane on a porous glass disc by substrate self-transformation

Dong Weiyang;Ren Yu;Long Yingcai   

  1. Fudan Univ, Dept Chem.Shanghai(200433)
  • Online:2000-11-15 Published:2000-11-15

在乙胺和水的混合蒸汽相中,首次通过载体自转晶,在多孔玻璃表面原位合成了B-Al-MFI型沸石膜。X射线衍射和扫描电镜观察证明,膜中沸石晶体的取向是随机的。晶体尺寸约为15~25μm,单层晶体厚的膜约为10~20μm。在焙作去有机模板剂后的沸石膜上,O~2和N~2的透过性分别为0.095×10^-^8和0.15×10^-^8mol/(m^2·s·Pa)。计算的O~2/N~2的理想选择值(0.63)明显低于诺森扩散的理想选择性值(0.94)和透过原载体的理想选择性值(0.91)。

关键词: 铝, 硼, 沸石, 原位合成, X射线衍射分析, 扫描电子显微镜

An B-Al-MFI-type zeolite membrane was in-situ synthesized on the surfaces of a boron-silicon porous glass disc by substrate self- transformation in the vapor of ethylamine (EA) and H~2O. Both XRD and SEM show that the zeolite crystals on the surfaces of the orous glass disc are in random orientation. The crystal sizes in the membrane are in the range of ca. 15~25μm. The thickness of the membranes in the form of one-crystal layer is ca. 10·20μm. The permeability of the calcined B-Al-MFI-type zeolite membrane to O~2 and N~2 are 0.985×10^-^8 and 0.15×10^-^8 mol/(m^2·s·Pa) respectively. The calculated ideal selectivity of O~2/N~2(0.63) is obviously lower than that for Knudsen behaviour (0.94) and for the substrate (0.91).

Key words: ALUMINIUM, BORON, ZEOLITE, X-RAY DIFFRACTION ANALYSIS, SCANNING ELECTRON MICROSCOPES

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