HEAVY OIL CATALYTIC CRACKING CATALYST AND PREPARATION METHOD THEREFOR

摘要

The present invention relates to a heavy oil catalytic cracking catalyst and a preparation method therefor. The catalyst contains 2%-50% of ultra-stable rare earth Y-type molecular sieve by weight, 0.5%-30% of one or more types of other molecular sieves, 0.5%-70% of clay by weight, 1.0%-65% of heat-resisting inorganic oxide by weight, and 0.01%-12.5% of rare earth oxide by weight. The ultra-stable rare earth Y-type molecular sieve is obtained through the following procedures: an NaY molecular sieve is used as the raw material, and rare earth exchange and dispersion pre-exchange are performed; then, the molecular sieve slurry is filtered, cleaned by using water, and roasted for the first time, to obtain the "exchanged once roasted once" rare earth sodium Y-type molecular sieve, there being no limit on the sequence of performing the rare earth exchange and the dispersion pre-exchange; afterwards, the "exchanged once roasted once" rare earth sodium Y-type molecular sieve undergoes ammonium salt exchange sodium reduction, and is roasted for the second time. The catalyst provided by the present invention has the features of high heavy oil conversion capability, high total liquid yield, and high yield of light oil.