| 摘要 |
A method is disclosed for preparing a silicoaluminophosphate molecular sieve, characterized in that the P2O5 to alumina mole ratio at the surface is about 0.80 or less, the P2O5 to alumina mole ratio of the bulk is 0.96 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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