Rare earth stabilized Cr/Ti substituted molecular sieves
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United States of America Patent
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Nov 18, 1997
Grant Date -
N/A
app pub date -
Apr 10, 1996
filing date -
Apr 10, 1996
priority date (Note) -
Expired
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Abstract
Molecular sieve compositions have been synthesized which are resistant to the loss of framework atoms. Specifically, the molecular sieves of the invention have the empirical formula mA: (M.sub.w Al.sub.x Si.sub.y)O.sub.2 where A is at least one rare earth metal, M is chromium or titanium and 'm', 'w', 'x' and 'y' are the mole fractions of A, M, Al and Si respectively. Applicants have discovered that the rare earth metals prevent loss of chromium and titanium from the framework and degradation of the molecular sieve. Along with the composition, a process for preparing the composition and processes using the composition are disclosed and claimed.
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