FIELD: chemistry.
SUBSTANCE: invention relates to molecular sieves used as catalysts. Disclosed is a phosphorus-containing or phosphorus-modified molecular sieve ZSM-5 for catalytic cracking, characterized by that during its surface elemental analysis XPS, value n1/n2 is ≤0.1; where n1 is the number of moles of phosphorus, and n2 is the total number of moles of silicon and aluminium. Invention also discloses a cracking aid, a cracking catalyst containing said phosphorus-containing/phosphorus-modified molecular sieve ZSM-5, and methods for production thereof, as well as use thereof.
EFFECT: disclosed molecular sieve has improved hydrothermal stability, and a catalyst based thereon increases cracking activity.
35 cl, 9 dwg, 21 tbl, 41 ex
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|---|---|---|---|
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