| 简介 |
FIELD : petroleum processing.
SUBSTANCE : catalyst is characterized by that content of rare-earth elements in crystalline lattice of Y-zeolite, based on RE2O3, is 4 to 15 wt %, initial size of elementary cell is 2.450 to 2.458 nm, and size of equilibrium structure of elementary cell after its treatment with 100% steam at 800°C for 17 h exceeds 2.430 nm. Also described is a method for preparation of above catalyst for hydrocarbon cracking comprising (1) drying Y-zeolite with rare-earth element ions to water level below 10%, then, at a weight ratio SiCl4/Y-zeolite, interacting zeolite with gaseous SiCl4 supplied with dry air at 150-600°C for a period of time from 5 min to 2 h after reaction followed by removing residual soluble by-products in zeolite by washing with decationized water; (2) mixing and suspending 10-50% Y-zeolite with rare-earth element ions prepared in step (1), 10-60% binder, and 2-75% clay followed by forming catalyst by spray drying and using it.
EFFECT : increased catalytic activity, hydrothermal stability, degree of heavy oil conversion, and selectivity with respect to gasoline, dry gas, and coke, and considerably reduced content of olefin in produced gasoline.
33 cl, 3 dwg, 17 tbl, 36 ex |
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