Patent ID: 7214637

Claim:
A catalytic composition based on an MFI-type zeolite in the form of microspheres with an average diameter ranging from 30 to 200 μm, containing a quantity of silica ligand ranging from 15 to 20% by weight, having a resistance to attrition, expressed as Davison Index<6.0, obtained by a process, comprising: a) hydrolyzing silicon alkoxides in an aqueous medium and under acid conditions, thereby forming a silica sol; b) mixing the silica sol with an aqueous dispersion of MFI-type zeolite particles; c) adjusting the pH of the hybrid silica sol obtained in step (b) to a pH value not higher than 6.0; and d) emulsifying/gelating the hybrid sol in paraffinic, cycloparaffinic or aromatic hydrocarbons, in the presence of a non-ionic surface-active agent or a suitable combination of a non-ionic and cationic surface-active agent.