PETROLEUM HYDROCARBON CRACKING CATALYST THAT CONTAINS RARE EARTH ZEOLITE Y AND ITS PREPARATION

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The present invention relates to a petroleum hydrocarbon cracking catalyst that contains rare earth zeolite Y and its preparation. It is characterized that the said rare earth containing zeolite Y has an intracrystalline rare earth content of 4-15 wt.%% on the basis of rare earth oxide, an original unit cell constant of 2.440-2.465nm, and a balanced unit cell size greater than 2.435nm after being aged under severe conditions of 100%% steam at 800 °C for 17 hours. The process for preparing the catalyst comprises drying the rare earth-containing zeolite Y so that its water content is less than 1Owt.%%; introducing gaseous silicon tetrachloride carried by dry air in a silicon tetrachloride to zeolite Y weight ratio of 0.1-0.9 : 1; purging with dry air after reacting; and washing with decationized water to remove the residual soluble by- products to get the said rare earth containing zeolite Y; then mixing it with the raw materials that contains clay and binder; beating, spray drying and shaping. The catalyst can lowered the zeolite usage by 5-25%% comparing with the catalyst for cracking the heavy oils and reducing olefins prepared by the piror art. It has high activity and hydrothermal stability, strong heavy oil transform power, and good gasoline, dry gas, and coke selectivity. And in the product, the olefin content in the gasoline may be lowered effectively. © KIPO & WIPO 2007