Synthesis of a crystalline silicoaluminophosphate
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United States of America Patent
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Oct 27, 1992
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app pub date -
Jul 22, 1991
filing date -
Feb 12, 1988
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Abstract
A method is disclosed for preparing a silicoaluminophosphate molecular sieve, characterized in that the P.sub.2 O.sub.5 to alumina mole ratio at the surface is about 0.85 or less, the P.sub.2 O.sub.5 to aluminia mole ratio of the bulk is 0.94 or greater and the silicon content at the surface is greater than that of the bulk, from a reaction mixture containing particles less than 80 microns in diameter.
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