Preparation of supported zeolite ZSM-5 membranes by in-situ crystallization
Conference
·
OSTI ID:126798
- California Institute of Technology, Pasadena, CA (United States)
Zeolite ZSM-5 films of 5-10 {mu}m thickness were grown on macroporous {alpha}-Al{sub 2}O{sub 3} disks placed horizontally in a clear synthesis solution (SiO{sub 2}, Al{sub 2}O{sub 3}, Na{sub 2}O, TPA{sub 2}O, H{sub 2}O) and subjected to 12-24 hours hydrothermal reaction at 150-180{degrees}C. After extensive experimentation, synthesis compositions were identified that gave films of well intergrown ZSM-5 crystals. The films appeared free of cracks or pinholes in SEM and had pure gas n-C{sub 4}H{sub 10}:i-C{sub 4}H{sub 10} permeance ratio of 18 and 31 at 30{degrees}C and 185{degrees}C, respectively. The H{sub 2}:i-C{sub 4}H{sub 10} permeance ratio was 151 and 54 at 30{degrees}C and 185{degrees}C, respectively. The role of substrate pore size and composition of the synthesis solution on membrane structure and properties will be discussed.
- OSTI ID:
- 126798
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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