A study of silicalite-1 and Al-ZSM-5 membrane synthesis on stainless steel supports

作者：Mabande GTP; Pradhan G; Schwieger W^*; Hanebuth M; Dittmeyer R; Selvam T; Zampieri A; Baser H; Herrmann R

来源：Microporous and Mesoporous Materials, 2004, 75(3): 209-220.

DOI：10.1016/j.micromeso.2004.07.009

• MFI membrane
• single gas permeation
• seeding
• stainless steel support

Silicalite-1 and Al-ZSM-5 membranes were prepared by combining one-step in situ seeding with one secondary membrane growth step. For membranes prepared under similar conditions, Al-ZSM-5 membrane growth was found to be considerably slower than Silicalite-1 growth leading to a significantly higher preferred axial orientation of the Silicalite-1 membranes. H(2)/SF(6) single gas permeation measurements revealed that for both membrane types a correlation existed between the H(2)/SF(6) ideal perm-selectivities and the zeolite layer thickness. Above a certain thickness the defect density is independent of layer thickness. However, Al-ZSM-5 membrane perm-selectivities were higher, despite lower membrane thicknesses and comparable hydrogen permeation rates. For example, room temperature ideal H(2)/SF(6) perm-selectivities of about 136 and 65 were measured for a 7.5 mum thick Al-ZSM-5 and a 45 mum thick Silicalite-1 membrane, respectively. Comparison to literature data revealed that the membranes were of good quality. Moreover, reproducibility of the membrane synthesis procedure proved to be good.

• 出版日期2004-11-2