Silicon substituted zeolite compositions and process for preparing same
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United States of America Patent
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-
Mar 5, 1985
Issued Date -
N/A
app pub date -
Oct 28, 1981
filing date -
Aug 14, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Aluminum from AlO.sub.4 -tetrahedra of as-synthesized zeolites is extracted and substituted with silicon to form zeolite compositions having higher SiO.sub.2 /Al.sub.2 O.sub.3 molar ratios and exhibiting distinctive chemical and physical properties. The preparative procedure involves contact of the starting zeolite with an aqueous solution of a fluorosilicate salt using controlled proportions and temperature and pH conditions which avoid aluminum extraction without silicon substitution.
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