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AssigneesChina Petroleum & Chemical Corporation, Research Institute of Petroleum Processing, Sinopec
InventorsJun Du, Zheng Li, Zhijian Da, Mingyuan He
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The present invention discloses a high stability rare earth zeolite Y with high rare earth and the preparation process thereof, which zeolite has a content of rare earth of 4-15 wt %, a unit cell constant of 2.450-2.458 nm, a differential thermal collapsed temperature of 1000-1056° C., a silica to alumina ratio of 8.3-8.8, and a content of sodium oxide less than 1.0 wt %. Said zeolite is prepared by drying a rare earth-containing zeolite Y, introducing gaseous silicon tetrachloride carried by dry air and reacting at a temperature of 150-600° C. for 10 min to 6 h, then purging with dry air and washing with de-cationized water to remove the soluble by-products. The rare earth zeolite Y possesses high activity and selectivity for cracking the heavy oils, high activity for hydrogen transfer, has good coke selectivity, can effectively increase the yield of light oils, and improve the quality of gasoline and thus can directly serve as an active component for preparing various hydrocarbon cracking catalysts.
A process for preparing a rare earth zeolite Y comprising drying the rare earth-containing zeolite Y so that its water content is less than 10 wt %, introducing gaseous silicon tetrachloride carried by dry air in a silicon tetrachloride to zeolite Y weight ratio of 0.1-0.9:1, reacting at the temperature of 150-600° C. for 10 mm to 6 h, then purging with dry air for 5mm to 2 hr, and washing with de-cationized water to remove the residual soluble by-products such as Na+, Cl−, Al3+ and the like in the zeolite,
A process for preparing a rare earth zeolite Y comprising treating zeolite Y with silicon tetrachloride, wherein the treated zeolite has an intracrystalline rare earth content of 4-15 wt % on the basis of RE2O3, a unit cell constant of 2.450-2.458 nm, and a differential thermal collapsed temperature of 1000-1056° C.
Dependencies are inferred from the claim text.