Isomorphously substituted molecular sieve membranes
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United States of America Patent
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Jul 11, 2006
Grant Date -
Nov 25, 2004
app pub date -
Jun 15, 2004
filing date -
Jan 21, 2000
priority date (Note) -
Expired
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Abstract
Zeolite membranes that can be used to continuously separate components of mixtures are disclosed. The zeolite membranes are prepared by isomorphous substitution, which allows systematic modification of the zeolite surface and pore structure. Through proper selection of the basic zeolite framework structure and compensating cations, isomorphous substitution permits high separation selectivity without many of the problems associated with zeolite post-synthesis treatments. The inventive method for preparing zeolite membranes is alkali-free and is much simpler than prior methods for making acid hydrogen zeolite membranes, which can be used as catalysts in membrane reactors.
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