| 简介 |
FIELD : chemistry.
SUBSTANCE : invention relates to a catalytic cracking composition. The composition contains : a) from approximately 12 to approximately 60 wt % zeolite Y; b) from 0.5 to 6 wt % rare-earth element, measured in form of an oxide of a rare-earth element; c) at least approximately 10 wt % pentasil, where the weight ratio of pentasil to zeolite Y is equal to at least 0.25 but not more than 3.0; and d) zeolite Y and pentasil make up at least approximately 35 wt % of the weight of the entire catalyst composition. The invention also discloses catalytic cracking methods.
EFFECT : invention increases output of light olefins.
81 cl, 8 ex, 8 tbl |
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