Faujasite catalyst, its preparation, and its use for petroleum feedstock cracking.

摘要

A fluid cracking catalyst is described consisting essentially of microspheres of in-situ crystallised Y-faujasite having a unit cell size of less than 2.460 nm, a sodium content (as Na2O) of less than 2% by weight, a micropore volume of up to about 0.25 cc/g and a surface area in excess of 250 m<2>/g. A method of preparing catalyst microspheres containing Y-faujasite comprises providing microspheres containing at least 40 weight % [e.g. 50 to 79 weight %] of in-situ crystallised Y-faujasite having a micropore volume of up to 0.25 cc/g and reducing the unit cell size of the Y-faujasite by at least 0.001 nm and the sodium content by ammonium exchange and subsequent calcination (preferably in the presence of steam). The catalyst of the invention is useful in a petroleum feedstock cracking process to obtain high yields of high octane gasoline.