Process for the preparation of MFI-type zeolitic catalysts
AssigneePolimeri Europa S.p.A.
InventorsLuigi Balducci, Leonardo Dalloro, Alberto Cesana, Roberto Buzzoni
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Abstract
The present invention relates to a process for the preparation of zeolitic catalysts of the MFI type in spheroidal form. The process consists in emulsifying and consolidating in paraffinic hydrocarbons, in the presence of a non-ionic surface-active agent or a suitable combination of a non-ionic surface-active agent and a cationic surface-active agent, a dispersion of particles of zeolitic material of the MFI type in a silica sol.
Claims23
A process for the preparation of zeolitic catalysts of the MFI type via emulsion/gelation comprising the following steps:
- a) preparation of a silica sol by the hydrolysis of silicon alkoxides in an aqueous medium and under acid conditions;
- b) mixing of the silica sol with an aqueous dispersion of MFI-type zeolite particles;
- c) basification of the hybrid sol (b) to values not higher than pH 6.0;
- d) emulsification/gelation of 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.
The process according to the previous claims, wherein the cationic surface-active agent is cetyltrimethylammonium bromide (CTMABr) and the non-ionic surface-active agent is sorbitan monooleate.
Dependencies are inferred from the claim text.