Preparation of zeolite ZSM-5 membranes by in-situ crystallization on porous {alpha}-Al{sub 2}O{sub 3}

Journal Article · Mon May 01 04:00:00 EDT 1995 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie00044a018· OSTI ID:178420

Yan, Y; Davis, M E; Gavalas, G R ^[1]

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1. California Inst. of Tech., Pasadena, CA (United States). Div. of Chemistry and Chemical Engineering

Zeolites are used extensively in catalysis and in gas separation and purification. If the zeolite could be employed in membrane form, gas separation could be accomplished by simpler and more economical steady flow. Zeolite membranes are also promising for membrane reactor processes where integration of separation with chemical reaction can improve reaction conversion or selectivity. Zeolite ZSM-5 membranes were grown on porous {alpha}-Al{sub 2}O{sub 3} disks by in-situ hydrothermal synthesis at 175 C. The zeolite layers were formed on the bottom face of disks placed horizontally near the air-liquid interface of clear synthesis solutions. Extensive experimentation was carried out to find compositions that gave continuous polycrystalline films. The films grown with the optimized composition were about 10 {micro}m thick and consisted of well-intergrown crystals of about 2 {micro}m size. Pure gas permeation measurements of the most successful preparation yielded hydrogen : isobutane and n-butane : isobutane ratios of 151 and 18 at room temperature and 54 and 31 at 185 C, respectively.

• Sponsoring Organization: USDOE
• OSTI ID: 178420
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 5 Vol. 34; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
08 HYDROGEN
2-METHYLPROPANE
36 MATERIALS SCIENCE
ALUMINIUM OXIDES
BUTANE
CRYSTAL GROWTH
FABRICATION
GRAIN SIZE
HYDROGEN
HYDROTHERMAL SYNTHESIS
IN-SITU PROCESSING
MEMBRANE TRANSPORT
MEMBRANES
PERMEABILITY
ZEOLITES