with the metal using the known incipient wetness method and the dried powdered additive composition is preferably formed into shapes suitable for use in the fcc unit application_number US 200913055639 A description in accordance with the present invention the sulfur content of an fcc gasoline is reduced to lower levels by the use of the additive composition of the invention mixed with a conventional fcc catalyst the fcc catalyst is preferably made of powder and generally possesses an average particle size in the range of 50 100 microns and a bulk density in the range of 0 5 1 0 kg l it is preferred that the particle size density shape and mechanical strength of the catalyst additive composition of the present invention is the same as a conventional fcc catalyst in which the composition is to be physically mixed the support material of the additive compositions of the present invention is preferably a montmorillonite clay possessing a surface area in the range of 150 350 m 2 g clay material itself possesses considerable capacity to reduce sulfur in gasoline fraction however the reduction in the benzothiophene fraction is typically minimal it was observed that the impregnation of only a lewis acid component onto the clay did not significantly increase either overall sulfur reduction capacity or the reduction of benzothiophene it was also observed that use of an additive composition of the clay material that was impregnated with zinc and a metal from group iiia of the periodic table such as ga or group.