Method for preparing in-situ
crystallization type catalytic
cracking catalyst The method comprises: (1) using kaolin as a
raw material to prepare in-situ
crystallization products: adding deionized water, a binder, a poly dimethyl diallyl
ammonium chloride auxiliary agent into kaolin, obtaining kaolin spray microballoons by
spray drying prepared mixed seriflux,
roasting, mixing roasted microballoons with a guiding agent, and then obtaining the in-situ
crystallization products with 50-70% of NaY
zeolite after hydrothermal crystallization,
filtration, washing with water and
drying, wherein the adding amount of poly dimethyl diallyl
ammonium chloride auxiliary is 1-10% of the quantity of kaolin; (2) exchanging and
roasting the in-situ crystallization products: fully mixing the in-situ crystallization products and 0.01-3N acid solution in a liquid-
solid mass ratio of 4-15:1 under 20-100 DEG C, regulating a pH value in a range of 2.8-6.0, treating for 10-100min, then adding one or more of
ammonium salts,
rare earth or
phosphor for exchanging, and
roasting, to obtain the in-situ crystallization type catalytic
cracking catalyst.