SIOC English
化学学报
高级检索

化学学报 ›› 2003, Vol. 61 ›› Issue (10): 1521-1523.    下一篇

研究论文

蒸汽相中c轴取向连续完美单层B-AI-ZSM-5沸石膜的原位制备

董维阳;任瑜;周伟正;龙英才   

  1. 复旦大学化学系分子催化与创新材料实验室
  • 发布日期:2003-10-15

In-situ Preparation of Continuous and Perfect Single-layer B-AI-ZSM- 5 Zeolite Membranes withc-axis Orientation in a Vapor Phase

Dong Weiyang;Ren Yu;Zhou Weizheng;Long Yingcai   

  1. Loboratory of Molecular Catalysis and Innovative Materials, Chemistry Department, Fudan University
  • Published:2003-10-15

PDF

593

被引次数

2

MFI型沸石分子筛，由于其具有较宽合成条件、合适均的一孔径、可修饰和改 性的骨架和孔道系统，高的热稳定性、水热稳定性、化学稳定性和机械强度，不仅 广泛应用于传统的催化和分离领域，而且也广泛地应用于膜的制备。由于MFI型沸 石晶体体型和晶内孔道系统 的各向异性，控制晶体在载体表面的定向生长对于膜 分离、膜催化、膜传感等都极其重要的。文献中报道的c轴取向MFI型沸石膜层的制 备方法有：（1）晶体在强电场作用下在载体表面上进行定向排 列，然后在排列好 的晶体间喷镀或电镀一层金属膜；（2）在有刻蚀槽的微结构硅片表面进行组装； （3）水热合成法；（4）晶种层的二次生长法等。

关键词: ZSM-5, 沸石, 水热反应, 晶体生长

Continuous and perfect single-layer B-Al-ZSM-5 zeolite membranes with c-axis orientation, self-transformation from B-containing porous glass disks with rough and uneven surfaces full of pits, have been in- situ prepared on the substrates surfaces in a mixed vapor of ethylenediamine, tri-n-propylamine and H_2O. The thickness of the membranes is ca . 60 μm. Under the conditions of 20 ℃ and 0.1 MPa pressure difference, the permeabilities of H_2, O_2 and N_2 through the calcined B-Al-ZSM-5 zeolite membranes are 2.298 * 10~(-8), 1.176 * 10~(-8) and 1.368 * 10~(-9) mol/(m~2·s·Pa), respectively. The calculated values of ideal selectivities of H_2 and O_2 over N_2 are 16.8 and 8.60, respectively. The data indicate that the calcined zeolite membranes are non-pinhole, non-crack, continuous and perfect.

Key words: ZSM-5, ZEOLITE, HYDRO-THERMAL REACTION, CRYSTAL GROWTH

中图分类号: