Rapid synthesis of oriented silicalite-1 membranes by microwave-assisted hydrothermal treatment

Motuzas J., Julbe A., Noble R.D., van der Lee A. and Beresnevicius Z.J. (2006) Rapid synthesis of oriented silicalite-1 membranes by microwave-assisted hydrothermal treatment. Microporous and Mesoporous Materials, 92 1-3: 259-269. doi:10.1016/j.micromeso.2006.01.014


Author Motuzas J.
Julbe A.
Noble R.D.
van der Lee A.
Beresnevicius Z.J.
Title Rapid synthesis of oriented silicalite-1 membranes by microwave-assisted hydrothermal treatment
Journal name Microporous and Mesoporous Materials   Check publisher's open access policy
ISSN 1387-1811
Publication date 2006-06-20
Sub-type Article (original research)
DOI 10.1016/j.micromeso.2006.01.014
Volume 92
Issue 1-3
Start page 259
End page 269
Total pages 11
Language eng
Subject 1503 Business and Management
2500 Materials Science
Abstract The objective of this work was to evaluate the potential of microwave (MW) heating for the rapid synthesis of thin silicalite-1 membranes by secondary growth from microwave-derived silicalite-1 seeds. The MW seed suspension was deposited by slip-casting on commercial α-Al2O3 supports and zeolite membranes were obtained after a synthesis time as short as 30-150 min, by MW-assisted secondary growth at 393-453 K. The membrane thickness varied typically from 200 nm to a few μm, with glassy-like or columnar morphologies, respectively, depending on the synthesis conditions. The morphology, thickness, homogeneity, crystal preferential orientation (CPO) and single gas permeation properties of the silicalite-1 membranes have been studied in relation to the synthesis parameters. The highest single gas permeances and medium n/i-butane selectivity were obtained with the membrane prepared at the lowest temperature (120 min at 403 K), although a higher synthesis temperature (433 K) was needed to get a higher n/i-butane selectivity (40-50). An oblique crystallographic preferred orientation (101-CPO) was found for this attractive membrane whose N2 permeance reached 1.5 × 10-6 mol m-2 s-1 Pa-1 at 294 K. A very low ideal selectivity was obtained for the membrane prepared at 453 K for 120 min, which is more clearly c-oriented (c-axis CPO), and in which defects were detected.
Keyword Membrane
MFI
Microwave heating
Secondary growth
Silicalite-1
Synthesis
Zeolite
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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