Fcc catalyst with ultrastable zeolite and transitional alumina its preparation and use

Abstract

Process for the preparation of a catalyst and a catalyst comprising the use of chi or gamma or gibbsite alumina. Thus, in one embodiment, the invention provides an FCC catalyst composition comprising of ultra-stabilize Y zeolite (USY zeolite) with total Lewis acidity retention of at least above 15% when increasing the adsorption temperature from 200 to 400° C. in pyridine adsorbed FT-IR and at least above 35% retention in total acidity when increasing the desorption temperature from 300 to 400° C. in ammonia TPD measurement and at least two different alumina types wherein at least one alumina is a dispersible binding alumina sol and the other alumina is of a transitional alumina phase with XRD peaks at about 37.6 (311), 45.8 (400) and 67 (440) 2-theta (referred herein as gamma alumina) or metastable phase alumina with characteristics XRD peaks of 2θ values of 37, 43, and 67 degrees (referred herein as chi alumina) or non-peptizable gibbsite-alumina has the characteristics XRD peaks of 2θ values of 18, 20.3 and 38 degrees (referred herein as gibbsite alumina). Further, the total amount of chi or gamma or gibbsite alumina is greater than 0 wt % to about 20-30 wt %.

Dependencies are inferred from the claim text.